What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

McIntosh C 504

 McIntosh C 504 The best Compact Preamplifier
When you need a reliable, low noise flexible preamplifier in a compact size, you need the McIntosh C 504.
The values to look for in a preamplifier are:
Quality construction and design excellence
Mechanical strength
Electronic stability
Convenience of operation
Versatility and superipr performance.
 The McIntosh C 504 is a high technology preamplifier in a compact new case size. The featuter and performance of the C 504 reflect the latest in McIntosh Laboratory engineering design excellence.

Precision Tracking Volume Control
The volume control, manufactured for McIntosh Laboratory, is a step attenuator which has tracking accuracy within 1 dB throughout its entire range. Such extremely accurate matching is achieved through electronically controlled trimming of the resistance material deposited on pairs of miniature printed circuits. Tracking accuracy and quiet performance as in ordinary volume controls.
True Loudness Compensation

The C 504 active circuit loudness control is continuously variable, with constant midrange gain and acts independently of the volume control. The loudness contour is accurately modeled after the Fletcher Musom family of "Equal Loudness" curves. Use of this control restores proper listening response at even the softest listening levels.
 FET Analog Input Switching
All critical input switching is done electronically using field effect transistor analog switches. The front panel selector simply switches small amounts of control DC voltage which turn the FET analog switches on or off. Since the FET analog switches are located near the input jacks, the length of interconnecting leads is much shorter. Noise, switching transisnts, and hum pickup are eliminated.

Tri-Frequency Program Equalizer
Three separate controls allow the balance and response of musical information to be adjusted with far more flexibility than with conventional tone controls. The center frequencies of the controls are 30 Hz, 750 Hz and 10 kHz. Plus and minus 12 dB of ontrol is available. Use of the program equalizer controls does not affect in the slightest, the low noise, low distortion performance of the preamplifier. When the equalizer controls are in their center or flat detent position, their action is neutral and response of the preamplifier is absolutely flat.
 Headphone/Output Amplifier
The main output amplifier section of the preamplifier is a push-pull complementary class AB circuit. Because of the extremely low distortion and power capability of this circuit it is used for both main and headphone outputs.

Integrated Circuit Operational Amplifiers
Both the magnetic phono and the equalizer amplifier stages utilize new high technology integrated circuit operational amplifiers. Noise factors are incrediably low, and distortion levels are at or below the limits of present day test equipment.
Specifications C 504
FREQUENCY RESPONSE:  20 Hz to 20 kHz +0, -0.5 dB
Main Out :  2.5 V
Headphone :  750 mV
Tape Out :  250 mV
DISTORTION:  0.02% (max. at 2.5 V output from 20 Hz to 20 kHz)
Input to Main Out
Phono 1 and 2:  2,2 mV in for 2,5V out (61,1 dB gain at 1 kHz)
Tuner, Tape 1 and 2, Aux:  250 mV in for 2,5 V out (20 dB gain at 1 kHz)
Input to Headphone Out
Phono 1 and 2:  2,2 mV in for 750 mV out (50,7 dB gain at 1 kHz)
Tuner, Tape 1 and 2, Aux:  250 mV in for 750 mV out (9,5 dB gain at 1 kHz)
Input to Tape Out Phono 1 and 2:  2,2 mV in for 250 mV out (41,1 dB gain at 1 kHz)
Tuner, Tape 1 and 2, Aux:  250 mV in for 250 mV out (0 dB gain at 1 kHz)
Phono 1 and 2: 
-90 dB IHF A-weighted, below 10 mV input
-80 dB unweighted, below 10 mV input
Tuner, Tape 1 and 2, Aux: 
- 100 dB IHF A-weighted, below 250 mV input
-90 dB unweighted, below 250 mV input
Phono 1 and 2 :  47 k Ω and 50 pF
Tuner, Tape 1 and 2, Aux :  47 k Ω
Main Out :  less than 100 Ω  (to operate into 5 kW or greater)
Headphone :  8 Ω
Tape Out :  less than 200 Ω  (to operate into 5 kW or greater)
Center Frequencies:  30, 750, and 10 kHz
Boost and Cut:  ±12 dB
POWER REQUIREMENT:  120 Volts  50/60 Hz, 25 Watts
15 Transistors
14 Field Effect Transistors
11 Silicon Diodes
11 Integrated Circuits
Front Panel (W X H):406 X 92 mm (16 x3-5/8 inches).
Chassis (W x H x D):375 x 60 x 368 mm  (14 3/4 x 2 3/8 x 14 1/2 inches, including connectors). Knob clearance required is 1 1/4 inches (3.2 cm) in front of mounting panel.
FINISH:  Front panel is anodized gold and black with special gold/teal nomenclature illumination. Chassis is black.
MOUNTING:  Exclusive Mcintosh developed professional PANLOC

WEIGHT:  6,4 kg (14 pounds ) net, 11,3 kg  (25 pounds) in shipping carton.

McIntosh MC 502

 When you need high power at very low distortion in a small, compact light weight, reliable power amplifier then you need the MC 502 McIntosh.
The values to look for when looking for a power amplifier are:
Quality construction.
Design excellence.
Mechanical strength
Electrical versatility
Convenience of operation
Stability and superipr performance.
 The McIntosh MC 502 power amplifier is probably the most compact source of very low distortion stereophonic power in existence. It is truly unique. More than any other amplifier it provides very low distortion stereo power, more sophisticated yet practical protection, and more bandwidth in a amazingly small yet eliable package. For example; the MC 502 weighs only 27 pounds yet it can deliver 75 watts per channel into 2,7 to 4 ohms loudspeakers, sine wave, continuous average power at less than 0,02% distortion, harmonic or intermodulation from 20 Hz to 20 kHz.
 There are three protection circuits which contribute to the reliability, long life, and excellent performance of the MC 502. the first control circuit is the Sentry Monitor which senses and confines current and voltage conditions to the safe operating characteristics of the output stage power transistors. Power Guard is the second control circuit, and eliminates amplifier output clipping. Amplifiers are capable of delivering large quantities of power when they are driven to clipping. Clipping is caused when the amplifier is asked to produce more power output than it can deliver with low distortion. A clipped amplifier can have more than 40% harmonic distortion. The extra energy content of the clipped signal will damage most loudspeakers. This new McIntosh advancement helps protect your speakers from this kind of damage. Power Guard does not limit the dynamic range or the power output of the power amplifier. The third control circuit is the speaker protection and turn on delay arrangement.
  The Sentry Monitor, Power Guard, and speaker protector circuits were developed by McIntosh engineers and are each covered by U.S. patents assigned to McIntosh Laboratory.
The cubical content of the amplifier chassis is less than 513 cubic inches and yet at full continuous sine wave output the entire structure is cool, a really effective example of thermal engineering. It is this kind of thermal transfer designing that makes possible the fabulous reliability of McIntosh engineering talent and achievement.
 Of all the good equipment manufactured today, only McIntosh amplifiers offer lowest distortion, high reserve power, long life, trouble free performance and highest value. For more than 20 years mcIntosh has been recognized as the leader. Continuous mahor investment in engineering and development provides you with conservative use of the newest and best in solid state physic and space age technology.
Specifications MC 502
Power Output (minimum sine wave continuous average power output per channel from 20 to 20,000 Hz, both channels operating)
Stereo:  75 watts into 2,7 to 4 Ω ;  50 watts into 8 Ω
Which is :
14,2 volts RMS across 2,7 Ω
17,3 volts RMS cross 4 Ω
20,0 volts RMS across 8 Ω
Mono (Bridged):  150 watts into an 8 Ω
Which is : 34,6 volts RMS across 8 Ω
Output Load Impedance
Stereo :  2,7 Ω to 8 Ω
Mono:  8 Ω 9obtained by connecting across the output terminals of both channels)
Total Harmonic Distortion
Stereo :  0,02% ( max. at any power level from 250 milliwatts to rated power per channel from 20 - 20,000 Hz, both channel operating)
Mono :  0,02% (  max. at any power level from 250 milliwatts to rated power per channel from 20 - 20,000 Hz)
Intermodulation Distortion
Stereo :  0,02% (max. at any power level from 250 milliwatts to rated power per channel both channels operating for any combination of frequencies, 20 - 20,000 Hz)
Mono :  0,02% (max. at any power level from 250 milliwatts to rated power for any combination of frequencies, 20 - 20,000 Hz)
Frequency Response: 
20 Hz - 20,000 Hz  +0, -0,25 dB at rated power
10 Hz - 100,000 Hz +0, -3 dB at rated power
Hum and Noise:  95 dB below rated output
Ratings Output Voltages:  25 volts for distribution lines
Damping Factor:  Greater than 50
Input Impedance:  75,000 Ω
Input Sensitivity/Impedance
Switchable:  0,75 volt or 2,5 volt/ level control provided for higher input voltges
Power Requirement:  120 Volts, 50/60 Hz ; 0,2 to 4 amperas 920 to400 watts)
Dimensions :
Front Panel (W x H) :  406 x 92 mm (16" x 3-5/8")
Chassis (W x H x D):  375 x 60 x 368 mm (14-3/4" x 2-3/8" x 14-1/2") 
Finish:  Front panel is anodized gold and black with special gold/teal nomenclature illumination. Chassis is black.

Weight:  12,2 kg (27 pounds) net

Aiwa XA-005

Specifications XA-005
Power Section
Effective Output Power:
70 W +70 W at 4 Ω, (THD 0,9%, 1kHz)
50 W +50 W at 8 Ω,  (THD 0,9%, 1kHz)
Total Harmonic Distortion:  0,05% (20Hz - 20kHz, 40 W, 8Ω)
Output Bandwidth:  20 Hz - 200 kHz (less than 0,05%)
Frequency Response:  5 Hz - 100 kHz, +0,5 dB -3 dB
Pre-amp Section
S/N Ratio (IHF A curve short circuited):
Phono MM : 85 dB (5 mV input)
Tuner, DAT, Aux, Tape:  100 dB
Input Sensitivity/Impedance:
Phono MM : 2,5 mV/47 kΩ
Tuner, DAT, Aux, Tape : 150 mV/47 kΩ
Phono MM Overload level:  85 mV (1kHz, THD 0,01%)
Output Level/Impedance:
Tape/DAT : 150 mV/47 kΩ
Headphones : 8 - 32 ohms
Speakers : 4 -16 Ω  (A + B : 8 - 16 Ω )
RIAA Deviation:  ±0,5 dB (30Hz - 15kHz)
Power Requirements [E,Z]:  Switchable 120/220/240 V, 50/60 Hz [220 V, 50 Hz]
Power Consumption [E,K,Z /H]:  350 W/ 125 W
Dimensions (W x H x D):  430 x 140 x 320 mm

Weight:  7,0 kg

Yamaha YHD-2

  Each of Yamaha's exciting new headphones has been designed to offer an optimum blend of high-fidelity music reproduction, sonic efficiency, and extended fatigue-free music enjoyment. The most immediately striking aspect of the YHD-2 natural Sound Stereo headphones is the sophisticated new design by Mario Bellini, a world-famous designer highly appraised for his ergonomic "human-engineering" approach to styling. Bellini's new design enables the YHD-1  and YHD-2 to be worn for hours on end without a trace of fatigue. Yet the deeply detailed musical transients and exciting sound dynamics are both products of Yamaha's exclusive Orthodynamic design.  These headphones are also remarkably efficient, meaning that they deliver generous levels of sound output with astonishingly low levels of distortion from comparatively low input levels. When used with portable headphone stereo players with minimal output levels, they deliver truly larger than life performance.
How Yamaha's Orthodynamic Design creates better sound.
Despite widely differing acoustic conditions for headphone sound reproduction, most headphone designs just use loudspeaker-type drivers that have been scaled down for headphone use. Yamaha took a completely different approach, designing the entire headphone driver unit from scratch. The result was our orthodynamic design. It consists of two sintered ferrite magnets with a combination voice coil/diaphragm sandwiched in between. The YHD-2 uses isotropic type-magnets,  for even sharper response and higher efficiency.

Magnetic Flux and the Voice Coil / Diaphragm.
The disc-shaped driver magnets are actually sets of distinct magnets, coaxially arranged with each successive one in opposite polarity. In between, there is a combination voice coil/diaphragm constructed of super-thin lighweight polyester film only 6 µm thick, corrugated in the direction of movement for optimum compliance. It's fixed only at the outside edge for maximum freedom of movement. This diaphragm is printed with aluminum voice coils wound in opposite direction, so that the diaphragm 'breathes" back and forth in precise response to the music signal. Openings in both the disc driver magnets and the driver body permit the air flow necessary for unimpeded diaphragm movement for strong bass response, while felt and urethane foam damping materials provide optimum load to the diaphragm for natural sound response over the entire audible spectrum.

Your ears will tell you what the specs confirm.
Both of these headphones deliver extremely well balanced response across the entire audio spectrum - 20 Hz all the way up to 20,000 Hz. The output sound pressure level, which is the amount of sound produced for the power input, is a remarkable 97 dB/mW for the YHD-2, and a spectacular 100 dB/mW for the YHD-1. performance this efficient enables you to enjoy genuine Yamaha naturas Sound fidelity even with today's popular portable headphone stereo players. Indoors or out, you'll never be without the finest sound quality ever possible from a headphone.
 Specifications  YHD-2
Impedance:  125 Ω
Magnet Diameter:  ø38 mm (1 ½")
Magnet Material:  Isotropic Ferrite
Diaphragm Diameter:  ø38 mm (1 ½")
Diaphragm Film:  6 µm Polyester
Frequency response:  20 - 20,000 Hz
Output SPL:  97 dB/mW (106 dB/V)
Rated Input:  0,7 W
Cord:  2,4 m (8 ft.) straight
Weight [cord/without cord]:  155 g (5,6 oz) / 133 g (4,7 oz)

BIC Venturi Formula 2

 The challenge was to create a reasonably small but sccurate speaker system that would not be so inefficient as to require an inordinately large amplifier to drive it, and yet be capable of delivering clean, high output sound pressure levels when used with powerful program equipment.
The BIC Venturi Formula 2 more than fulfills that objective . It is the most sensitive, highest power handling speaker system of its size ever offered.
It is result of not one, but several technical inventions and innovations carefully calculated to bring a new standard of performance to the home comparable to theater and concert hall requirements. And this is achieved with an accuracy of reproduction and economy of power that should satisfy the most critical musical tastes and limited budgets.
The enclosure is sturdily constructed to grade 1 furniture standards and finished in scuff-resistant, walnut polymer-coated wood. It is free of resonances and other spurious vibrations which add unnatural colaration (''tubbiness'', ''ringing'' or ''tunnel-like'' sounds), often mistaken as ''bas''.
A new type sonicall transparent atractive foam grille is available in a choice of black, brown, beige, burnt orange, blue and red. The grille can be resprayed to any other desired color.
An optional base, model VB-2, enhances the appearance of the Formula 2 when placed on  the floor.
Musical Dynamic Range
As music increases in sound level, the loudspeaker should remain faithfully in step at both the lowest and loudest passage, in many systems the speaker doen's "take off" until it is driven fairly hard and then at same maximum point is unable to produce more output sound to match the greater musical modulations. Some systems at this point exhibit "cone beakup" and other forms of distortion, or incur physical damage to voice coils,cones, etc. System with these problems (usually greater as the efficiency decreases) are not capable of wide 'dynamic range".
Since the Formula 2 is extremely efficient and can also handle high electrical input power with aplomb, its dynamic range will satisfy the critical listener, on all kinds of music and program sources.
Super tweeter
Although the "midrange" Biconex™ horn reproduces frequencies to actually well beyond 15,000 Hz, where most modest-sized speaker systems end, our investigations into psychoacoustic phenomena reveal a need to extend aurally perceptive response to at least 20,000 Hz or beyond, in order to preserve original sonic balance and hence musical timbre of instruments originating in the lower frequency ranges. This is particularly so in the Formula 2 because of its extended low frequency response and high energy levels. Although covering less than one musical octave (15,000 to beyond 23,000 Hz), a newly designed high efficiency high power capability super dome tweeter completes the system, and accurately handles the complex musical waveforms which contain harmonics extending into this ultra sonic range.
 Dynamic Tonal Compensation™ (D.T.C.)
The ability to hear different frequencies changes with sound level. At "discotheque" levels, most frequencies are heard equally. As the level decreases, less of the treble range and still less of the bass range is discerned. At moderate home listening levels and especially at "background" music levels, mostly the midrange is heard. Amplifier "loudness" or "contour" switches employ a fixed rate of compensation, but this is severely compromised by the efficiency of different speakers and further upset by amplifier volume control settings.
The Dynamic Tonal Compensation circuit (patents pending) automatically adjust the relationship of the midrange to the bass and treble ranges, in conformity with the Fletcher-Munson curves which have measured this human trait. Thus, as the amplifier volume control is changed the speaker alters its response to provide the ear with aurally flat response. All the music can now be heard all the time, regardless of how soft or loud it is being played. A defeat switch and continuously variable "Brightness" control on the speaker's front panel, enables the conventional use of the speaker if desired. Amplifier tone controls can still be used in the normal manner. The D.T.C. control board is located behind the removeable grille, for easy accessibility.

To provide a proper match to the exceptional efficiency of the bass section, the Biconex™ Pyramidal horn/compression driver unit (patents pending) was developed. To eliminate the need, as in other speakers, to interrupt the critical. Ear-sensitive midrange spectrum with a distortion producing crossover network, the operating range of this unit is 1500 to 15,000 Hz. The wide-angle deispersion pattern is uniform in all directions, permiting the cabinet to be used horizontally or vertically, as decor and physical needs dictate. A new inert material used in the horn totally eliminates metallic coloration of sound. The specially designed driver unit provides both an exceptionally smooth response throughout its assigned frequency range and an unusually high power handling capability to match the BIC Venturi bass section.
The principle of the BIC Venturi systems (patents pending) is now applied for the first time to speaker enclosure design. Briefly, it operates as an acoustic transformer in the bass range, converting low magnitudes of energy to levels many times greater and, additionaly, purer than would otherwise be possible from a woofer used in enclosures of other types. Utilizing a specially designed 8" woofer, bass notes as low as 30 Hz are solidly reproduced with thattight, clean sound which denotes excelent transient response and freedom from audible harmonic distortion.

The sensitivity of the BIC Venturi Formula 2 is so high, that amplifiers or receivers legitimately rated at as low as 15 watts RMS per channel will produce more than adequate sound levels for normal home listening. The Formula 2 is from 100 to 400% more efficient than "acoustic suspension" type systems, therefore requiring much less amplifier power.
On the other hand, the Formula 2 can handle amplifiers and receivers rated as high as 75 watts RMS per channel, with ease and reliability, providing sound pressure levels rivaling the loudest concert hall passages and the noisiest discotheques. Actually, the Formula 2 is capable of even greater electrical input power, but its maximum rating is intentionally given as 75 watts since such an amplifier is capable of producing 150 watts when driven to "clipping" … a form of amplifier distortion. Even under such conditionas, the Formula 2 can take it.
Maximum Power RMS Rated  Amplifier:  75 watts per channel
Effective Response:  30 - 23,000 Hz
Dispersion:  120° x 120°
Impedance:  at no time under 4 Ω
Manual : Continuously Variable "Brightness" Control
D.T.C. : "Automatic" with defeat switch
Driver Components:
Woofer :  8" heavy Duty
Midrange :  Biconex™ Horn/Compression Driver
Super Tweeter : Dome
Front Grille:  Removable reticulated foam
Dimensions (H x W x D):  19 ¾" x 12" x 11 ½"
Weight:  30 lbs (shipping)

Optional Base:  Model VB-2

Coral BX-2000

 12" 3-Way 5-Speaker System
From Coral's magnificent hall of sound comes yet another dynamic system - the BX-2000 with its big 100 W capacity, 25 Hz bass fidelity, and the new surround-sound that gives you matchless quality no matter where you are sitting.

Outstanding 100 W Capacity
Flexibility is an enormous asset. Even if one buys a quality speaker with the intention of using it in the home, it's comforting to know it has the power to sound every bit as good - probably better - in a hall. Linked to suitable amplification, the 100 W capacity of the BX-2000 is a magnificent way to fill a hall with undistorted sound.
 Exclusive Wide-Focus Acoustic Lenses
In most living rooms the easy chairs are not dead-center, so speakers that put all their best sound in the center of the room are missing the point. Coral's acoustic lenses ensure that maximum quality reaches every part of a room or hall. That's surround-sound - the freedom to sit where the furniture is.

Hollow Formed Cone
Coral cones always sound that little bit different from those of other speakers. The reason are the uniquely blended pulp from which they are made and the secret manufacturing process. The result is a cone with solid surfaces sandwiching a resilient lining. The sound is satin smooth, and brilliant.

Bass Reflex-Type Cabinet
The same care that Coral puts into all its speaker components is reflected in the design of the cabinets that house them. But a handsome appearance is not enough. Internal construction is a major factor that influences the dynamism of any speaker system. 
System:  3-way, 5-speaker
1 x woofer :  12" (305 mm)
2 x midranges :  5" (127 mm)
2 x tweeters :  2 ½" (64 mm) cone type tweeter
Capacity:  100 W
Sensitivity:  1-3 dB
Frequency Range:  25 - 25,000 Hz
Impedance:  8 Ω
Cabinet:  Bass-reflex type
Dimensions (H x W x D):  650 x 420 x 280 mm

Weight:  22 kg (48,4 lbs)

B&W P6

 B&W  P 6
Floor-standing loudspeaker system
Product Summary

The essential difference between the P6 and the other speakers in this series is a B&W trademark - the free-mounted tweeter - "tweeter on top". 
 Tweeter on top: B&W's Tweeter on top technology ensures that the sound remains focused and time-sensitive and that the stereo-image is presented with unparalleled three dimensional accuracy.

Combining a 165mm dia Cobex® bass drive unit with the Kevlar® bass/mid-range drive unit and a larger cabinet volume, the P6 delivers high power handling and efficiency with superb bass extension. 
 Technical highlights
Kevlar®: B&W developed and patented the method of using Kevlar® for loudspeaker cones to reduce unwanted standing waves. DuPont originally created Kevlar® for use in bulletproof vests. 
B&W P6 Specifications
Systems:  3-way, twin 4 th order vented box system
Drive Units: 
High Frequency :  1 x 26 mm magnetic fluid cooled metal dome
Bass/Midrange Frequency :  1 x 165 mm woven kevlar cone
Bass :  1 x 165 mm Cobex cone bass
Frequency Response:  30 Hz - 20 kHz  ±2 dB on reference axis
Frequency Range (-6 dB Frequencies):  26 Hz - 22 kHz
Dispersion (20 Hz - 10 kHz):
Horizontal :  ±2 dB over 60° arc
Vertical :  ±2 dB 10° arc
Sensitivity:  90 dB spl (2,83 V at 1m)
Crossover Frequency:  150 Hz, 3 kHz
Nominal Impedance:  8 Ω  (minimum 3,7 Ω)
Power Handling:  50 W - 2000 W into 8 Ω on undistorted programme
Dimensions (H x W x D):  1000 x 200 x 316 mm
Weight:  18,5 kg net
Finish:  Black Ash, Rosenut, Cherrywood

Grille:  Black Cloth

B&W P5

 B&W P 5
Floor-standing loudspeaker system
Product Summary

P5 is the mid-sized speaker in the P Series - 9% smaller than the P6 and 33% larger than the P4. All P Series speakers share the same width - a slim 200mm. 
 The key point of difference in the P5 is the lower bass drive unit, also present in the P6 but not the P4. It is in fact an extra bass-only drive unit; a 165mm dia Cobex® unit housed in its own separate reflex cavity within the cabinet.

The unusual thing about this unit is that the B&W engineers have deliberately taken the decision to select a lower bass drive unit which has different characteristics to the Kevlar® bass/midrange unit. This brings an extra degree of freedom to tailor the low-frequency response for the best possible combination of accuracy and extension which would not normally be possible
 Technical highlights
Kevlar®: B&W developed and patented the method of using Kevlar® for loudspeaker cones to reduce unwanted standing waves. DuPont originally created Kevlar® for use in bulletproof vests. 
B&W P5 Specifications
Systems:  3-way, twin 4 th order vented box system
Drive Units: 
High Frequency :  1 x 25 mm metal dome
Bass/Midrange Frequency :  1 x 165 mm woven kevlar cone
Bass :  1 x 165 mm Cobex cone bass
Frequency Response:  32 Hz - 20 kHz ±2 dB on reference axis
Frequency Range (-6 dB Frequencies):  28 Hz - 22 kHz
Dispersion (20 Hz - 10 kHz):
Horizontal :  ±2 dB over 60° arc
Vertical :  ±2 dB 10° arc
Sensitivity:  90 dB spl (2,83 V at 1m)
Crossover Frequency:  150 Hz, 3 kHz
Nominal Impedance:  8 Ω  (minimum 3,7 Ω)
Power Handling:  50 W - 200 W into 8 Ω on undistored programme
Dimensions (H x W x D):  905 x 200 x 301 mm
Weight:  14,5 kg net
Finish:  Black Ash, Rosenut, Cherrywood

Grille:  Black Cloth

B&W P4

 Floor-standing loudspeaker system
The P4 is the smallest speaker in the P Series, in order to achieve sufficient bass extension the design engineers at B&W came up with a unique solution.
The key difference, which is not visible from the outside, is the internal cabinet construction. A folded tapered duct has been used, which is selectively damped to give bass reinforcement similar to a reflex enclosure, without the danger of pipe resonances that would otherwise arise in the tall narrow enclosure. 
 Technical highlights
Kevlar®: B&W developed and patented the method of using Kevlar® for loudspeaker cones to reduce unwanted standing waves. DuPont originally created Kevlar® for use in bulletproof vests. 
 "The P4 is a two unit loudspeaker using a Kevlar coned bass/midrange driver crossing over at around 3,5 kHz to a new variant of B&W's long established light metal dome tweeter. This version, no wider than a matchbox, clearly demonstrates the size reduction that is possible through the incorporation of Neodymium in the magnet material without sacrificing the high flux density around the voice-coil which is required to maintain sensitivity and a fast response to transient sounds. In this application the only advantage of the reduced diameter is to enable closer proximity to the main unit, which can be an aid to cohesive integration. To this end the new unit is fitted with a bevelled escutcheon recessed into the front panel.

The 168mm outside diameter bass/midrange unit is of familiar B&W construction on a very open die-cast alloy chassis. This provides a very rigid mounting for the large ceramic magnet assembly, together with a firm seating in the recess provided in the baffle. The woven Kevlar cone is 120mm in diameter and is quite mildly tapered; it is fitted with a 30mm diameter voice-coil of 3.8 ohms DC resistance, centred in the magnet gap with the usual concentric bellows. The outer suspension is a convex rubber moulding providing a reasonably long throw and a sample unit showed a free-air resonance at 40Hz. ...
 The crossover filter components are fixed to a printed circuit board behind the input terminal panel which is recessed into the lower rear wall of the cabinet. Outwardly this displays four large gold-plated terminals with 4mm centres, each accessing one half of the filter for bi-wiring or bi-amplification; these are normally paralleled with the links provided. The bass/midrange section consists of only a single iron-dust cored inductor of I .75mFl; the treble section is a capacitor/inductor 'T' with a 1.5 ohms resistor to equalise the sensitivities of the two units."
Systems:  2-way, 4 th order tapered-line
Drive Units: 
High Frequency :  1 x 25 mm metal dome
Bass/Midrange Frequency :  1 x 165 mm woven kevlar cone
Freqqueny Response:  50 Hz - 20 kHz ±2 dB on reference axis
Frequency Range (-6 dB Frequencies):  37 Hz - 22 kHz
Dispersion (20 Hz - 10 kHz):
Horizontal :  ±2 dB over 60° arc
Vertical :  ±2 dB 10° arc
Sensitivity:  88 dB spl (2,83 V at 1m)
Crossover Frequency:  3,5 kHz
Nominal Impedance:  8 Ω  (minimum 3,7 Ω)
Power Handling:  30 W - 100 W into 8 Ω
Dimensions (H x W x D):  810 x 200 x 256 mm
Weight:  13,5 kg net
Finish:  Black Ash, Rosenut, Cherrywood

Grille:  Black Cloth

Pioneer SA-600

 A practically-prieced, medium-power solid state stereo amplifier with wide power bandwidth and frequency response.
This handsomely styled unit from Pioneer is perfect for the serious stereo enthusiast who is building his system within a stipulated budget. At a very practical price,  the SA-600 provides a host of imortant features and a lot of professional performance that will do musical wonders for any home stereo system. Its circuits use only long-life, low-noise silicon transistors, and thus the frequency response and signal-to-noise ratio are superb. The unit is also very versatile, in keeping with the Pioneer audio philosophy of giving the most for the consumer's money. You may use up to two tape decks or two speaker systems with the SA-600, and you may also adapt the unit for multi-amp use.
More for yo our money? The SA-600 is probably the finest value in a medium-power amplifier now available. Take a listen.
 Direct Coupling Preamplifer Section
The equalizer circuit of the SA-600 uses two-stage direct-coupling negative feedback circuits with low-noise silicon transistors. Use of these circuits means that the amplifier delivers an extra-wide dynamic sound range. Then the tone control section of the SA-600 employs low-noise silicon transistors. You may increase or decrease the audio signal delivered to the amplifier step by step with each click-stop. Rate of attenuation is indicated on the front panel. Finally, harmonic distortion with this amplifier is negligibly small, while signal-to-noise ratio is excellent and stable.
 Stable Power Amplifier Section
The power amplifier of the SA-600 is quasi-complementary design, single-ended push-pull circuit that insures virtually distortionless sound reproduction and a wide frequency response. Music power output of this unit is big compared to similarly-priced units, upp to 100 watts at 4 ohms, IHF. With both channels driven, continuous power output is 19 watts each channel at 8 ohms. And in the critical 20 to 20,000 Hz frequency range, both channels driven, the unit delivers 13 watts plus 13 watts at 8 ohms with THD measured less than 0,5%.
 Two Sets of Input Jacks and Output Terminals
The SA-600 is equipped with two pairs of Tape, Phono and Aux input terminals to permit ease of tape-to-tape duplicating and to allow comparison of different phono cartridges. You may use any two tape decks - open reel, cassette, 8-track cartridge, etc. - connected simultaneously with the amplifier. Additionally, you may use one microphone connected through the Mic input jack located on the front panel. The SA-600 is equipped to handle two sets of speaker systems which may be played simultaneously if desired to enable you to compare the tonal qualites of each system.

Pre/Main Amp Separator Switch
The preamplifier and main amplifier sections of the SA-600 can be used separately by using the pre/main switch. By adding an electronic crossover network (Pioneer model SF-700 or SF-500) and one or more power amplifiers, you may also adapt your music system to a multi-amplifier stereo system.

Other Features
The SA-600 has both high and low filters to eliminate unnecessary noises without tonal deterioration. The unit is also equipped with a loudness contour switch and mode switch.
Power Amp Section
Music Power Output (IHF):
100 watts at 4 Ω
70 watts at 8 Ω
Continuous Power Output (each channel driven):
31 watts/31 watts at 4 Ω
25 watts/25 watts at 8 Ω
Continuous Power Output (both channel driven):
20 watts + 20 watts at 4 Ω
19 watts + 19 watts at 8 Ω
Power Output ( in the Range 20 - 20,000 Hz both channel driven):  13 watts + 13 watts at 8 Ω (THD 0,5%)
Harmonic Distortion:  less than 0,5% (continuous power output)
I M Distortion:  less than 0,5 % (continuous power output)
Power bandwidth (IHF):  10 - 50,000 Hz (at 8 Ω, 0,5% THD)
Frequency Response:  15 - 70,000 Hz ±1 dB
Input Sensitivity/Impedance (1 kHz, continuous power output):  420 mV/7  k Ω
Speaker Impedance:  4 to 16 Ω
Daping factor:  30 (8 Ω, 1 kHz)
Semiconductors:  21 Transistors, 8 Diodes
Pre-amplifier Section
Output Voltage:  1 V (rated output), 3 V (max)
Harmonic Distortion:  less than 0,1%
Frequency Response:  20 to 30,000 Hz ±1 dB
Input Sensitivity/Impedance (1 kHz rated output):
Phono 1 and 2 :  2,3 mV/50 k Ω
Mic :  3,3 mV/20 k Ω
Tuner :  200 mV/95 k Ω
Aux 1 and 2 :  200 mV/95 k Ω
Tape Monitor 1 and 2 :  200 mV/95 k Ω
Recording Output:
Tape rec 1 and 2 (pin jack):  200 mV
Tape Rec (DIN connector):  30 mV
Tone Controls:
Bass :  -15 dB, +15 dB at 50 Hz
Treble :  -10 dB, +9,5 dB at 10 kHz
Loudness Contour:  +13 dB at 50 Hz ; +7 dB at 10 kHz (with volume control set at -40 dB position)
Low Filter:  -6,5 dB at 50 Hz
High Filter:  -8 dB at 10 kHz
Equalization Curve:  Phono RIAA standard
Hum and Noise (IHF): 
Phono : more than -80 dB
Tuner, Aux :  better than -95 dB
Channel Separation (1 kHz):
Phono :  more than 50 dB
Tuner, Aux :  more than 55 dB
Power requirements:  110, 120, 130, 220, 240 V, 50/60 Hz (switchable)
Power Consumption:  145 watts Max.
Dimensions (W x H x D):  430 x 145 x 337 mm (16-15/16" x 5-11/16" x 13-1/4")

Weight:  8,9 kg (19,lb 9 oz) [net]

Ariston RD 11

 The Ariston Audio RD 11 Transcription Turntable.
As with all good things, the Ariston RD 11 is very simple in concept - and in turntable design, simplicity is the essence of perfection.

A 24-pole synchronous motor, specially designed by Aristo engineers for the RD 11 minimizes wow and flutter. Its smooth running, combined with the high mass 9 ½ lb platter, have contributed to unquestionably excellent specifications. Wow and flutter is a mere 0,04%. Rumble is an exceptionally low -72 dB.
The main bearing elements consist of a precision ground mirror-finished shaft resting on a perfectly spherical ball-bearing, giving a single point of contact - and reducing friction to a bare minimum.
The tone-arm and platter are mounted on a shock absorber to achieve isolation from external vibrations. And two concentric  rubber rings provide positive record support with minimum surface contact, thus eliminating electrostatic build-up.
A slip-cluth mechanism on the belt drive prevents belt-stretching and, aided by the high-torque motor, ensures a swift and smooth build-up to playing speed.

Ariston Audio RD 11. brilliantly designed, precision engineered to bring you just one quality. Sound perfection. Available with either SME or Grace G940 tone-arms.

Type:  manual
Drive:  belt drive
Platter Mass:  9½ lbs
Speeds:  33  and 45 rpm
Wow and Flutter:  0.04%
Rumble:  -78dB
Power:  220 - 240 V, 50/60 Hz