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





Akai 4000D tape deck

Three Head Stereo Tape Deck

A superb stereo tape deck enabling stereo fans to produce the ultimate in high fidelity recordings

High quality three head system embodying the latest techniques, featuring an exclusive one micron gap recording and playback heads plus erase head

All silicon transistorized pre-amplifier reduces hissing noise to a minimum

Strudy mechanism providing excelent durability

Fine oil-finished wooden cabinet matching furniture and / or stereo set

 

Outstanding Features

4-track stereo/monaural recording and playback. For playback, the 4000 D requires an external power amplifier and speakers

2 speeds - 3-3/4 and 7-1/2 ips

3 heads - One micron gap recording and playback heads plus erase head

All silicon trasistorized pre-amplifier

Shield type head for high Signal-to-Noise Ratio

Two lever system ensures dependable and durable sure operation

Track selector for simple selection between stereo and monaural

Sound on sound (by using an optional cord). Sound with sound

Automatic shut off, instant stop control

Tape cleaner

Tape speed equalizer

Tape lifter in fast forward and rewind operation

DIN Jack

Stereo headphone jack

3-digit index counter with reset button, 2 VU meters

Fine oil-finished wooden cabinet

Vertical and horizontal operation

Universal voltage selector (from 100 V to 240 V, 50/60 Hz)

 

Specifications

Recording System:  4 -track stereo- monaural system

Motor:  Induction motor

Semiconductors;  17 silicon transitors, 2 Diodes; 2 rectifiers

At 7-1/2 ips :  Frequency Response:  30 to 22,00 cps ±3 dB

At 3-3/4 ips :  30 to 16,000 cps ±3 dB

Distortion: within 2% 1,000 cps  0VU

Wow and Flutter:

At 7-1/2 ips :  less than 0,15% RMS

At 3-3/4 ips :  less than 0,20% RMS

Signal-to-Noise Ratio: better than 50 dB

Input Level:

Microphone:  better than 0,5 mV

Line :  better than 50 mV

Output Level:  0 VU (1,23 V RMS)

Equalization:  Correct equalization for playback of tapes recorded to the NARTS curve

Recording Level Indicator:  2 VU meters

Fast Forward and Rweind Time:  150 sec. Using 1,200 foot tape at 50 cycles. 120 sec. At 60 cycles

Max Recoding Time:

4 hours monaural recording at 3 -2/4 ips (1,200 foot recording tape)

2 hours stereo recording at 3-3/4 ips

Dimensions (W x H x D):  315 x 405 x 180 mm (12-3/8" x 15-7/8" x 7-1/2")

Weight:  11,5 kg (25,3 lbs)


 

Akai SW-150 speakers


 

Superb Hifi Stereo Sound Effect

Akai 3-way stereo speaker system with high and midrange level controls. SW-150 is design matached to high fidelity Akai stereo tape recorders. Enjoy perfect reproduction of pure sounds from exciting high notes, to mellow, vibrant low tones

 

Specifications

Speakers:

Low Frequency:  12" Woofer

Mid Frequency:  5,25" Midrange

High Frequency:  2" Tweeter (Horn Type)

Impedance:  8 ohms

Max. Power Input:  40 W

Frequency Response:  40 - 20,000 Hz

Dimensions :  25-1/4" x 16" x 11-3/4"

Weight:  35,2 lbs (each)

Philips GA312 turntable

Servo electronic turntable with integrated tone arm

Electronically controlled for smoother reproduction

 

 

Features

A free-floating sub-chassis is suspended independently over the main chassis. The rigid main chassis absorbs any vibration. The floating sub-chassis gives further protection to stylus and record

Electronic stop system eliminates stylus side thrust distortion, temporary cross talk, thumping and groove jumping.

DC motor is combined with a tacho generator. A mini-computer regulates its operation. The computer constantly monitors the running speed. Any deviation - such as changes in cycle current or cleaning brush drag - is instantly corrected.

The driven platter is isolated from motor vibration by a shock-absorbing, precision ground and stabilized polyurethane drive belt. Flutter and rumble are dramatically reduced.

Elastically decoupled counterweight balances the cartridge weight in all planes.

Electronic circuits adjust the speed for 33-⅓ and 45 rpm records. Each speed hasd its own fine adjustment control. All controls have a ligh indicator

Tone-arm cue control lets you raise or lower the arm at any part of the record. Tone arm cueing is feather light, viscous damped and extremely accurate.

Adjustable anti-skating device counteracts the centrifugal force of the spinning record.

 


Specifications

Controls: electronic lighted indicators for 33-⅓ rpm start, 45 rpm start,and stop. Rocker bar for tone arm lift and cue. Two independent potentiometers for speed calibration

Speeds:  3-⅓ and 45 rpm

Speed Calibration Range:  ±3%

Wow and Flutter: 0,1%

Total Audible Rumble:  -62 dB measured according to hearing curve DIN B

Stylus Force Range:  0 to 4 grams

Side Thrust Compensation:  Adjustable for elliptical and spherical styli

Tone Arm:  Integrally coupled with platter on a free-floating sub-chassis for shock isolation

Arm Resonance:  7 kHz

Cartridge Mounting:  Slide-out plate universal, 1/2" mounting centers. Stylus overhang gauge provided.

Platter:  11-1/2" with anti-static rubber mat, 60 Hz stroboscopic ring included

Automatic Stop:  frictionless photocell-electronic system

Motor:  72-pole electronic tacho controlled DC servo motor

System:  belt-drive

Power Supply:  120 Volts AC, 50/60 Hz without modification or convertor UL approved

Power Consumption:  4 watts

Dimensions (W x H x D):  15-1/2" x 6-1/4" x 13-1/4")including dust cover)

Weight:  13,25 lbs (net)


 

Dahlquist M909 loudspeaker

The Dahlquist "M Series" ends the need for compromise. Originally designed for recording and broadcast studios, several models can now be offered for home use because of new techniques. In the Dahlquist tradition, the M Series solves many of the problems that still degrade the sound of other speaker systems. The Dahlquist M Series loudspeakers are the first fully enclosed systems to reproduce all the of the subtle, low level details of the music in the midst of extremely high level music signals. The reproduction of such dynamic shadings makes music come startlingly alive.

The Dahlquist M909

The M909 is a unique blend of technologies. This three-way system has the Dahlquist Un-Box enclosure and critically matched loudspeaker drivers, as do the other members of the M Series. But, in an exciting departure, the M909's specially designed midrange driver shares the cylindrical loading originally developed for the DD-20. as a result, the M909 not only gives the listener superb performance throughout the audio range it gives an extra measure of performance in the critical midrange, where most of the music "happens".

 


By using two matched high speed woofers, the M909 is able to deliver exceptional power in the bass and mid-bass regions. This brings home the type of sound power felt at a live concert -  and typically missing from home listening. These dual matched woofers have the additional benefit of providing a seamless transition to that all-important midrange.

Further, the M909 recreates a sound image of exceptional fidelity. The M909's reproduction of soundstage height, width, and depth draws the listener into the performance. These outstanding capabilities are apparent as life-sized images in space.

Thus, for the first time, experienced listeners can have it all-from a single loudspeaker system that fits in almost any size room, be it an intimate studio with a modestly powered receiver or a living room of generous proportions with high-powered, state-of-the-art electronics.

One of the hallmarks of Dahlquist loudspeakers is the coherency of the total sound. The M909's four drivers blend together seamlessly. As a result, harmonic relationships are accurately preserved. Individual instruments, and especially the human voice, retain their own distinct characters.

Naturally, as is expected from a Dahlquist loudspeaker system, the M909 incorporates as advanced and remarkable anti-diffraction technique which enhances accurate stereo imaging and greatly contributes to open, spacius, and accurate sound reproduction.



 

Tannoy Albury SL105 Surrey Speakers

The Tannoy Dual Concentric principle has long been recognised as one of the great technological breakthroughs in loudspeaker design,

Leading musicians use Tannoy Dual Concentric loudspeakers in their live performances  and many recording and broadcast studios rely on the Tannoy Dual Concentric to monitor the quality of their output. This same "monitor" standard of sound reproduction is available to yoy in the Surrey Series of Time Compensated Dual Concentric Loudspeakers from Tannoy.

Look behind the grille of any Surrey Series loudspeaker and you will see what appears to be a single drive unit. This is in fact the "2-speakers-in-One" Dual Concentric drive unit.

Operating through the centre of the bass cone, and sharing the same chassis frame, is a compression high frequency driver. These two separate drive units provide a single axis for the production of sound at all frequencies. The audio signal is supplied  to each drive unit by a time compensated crossover, that aligns both high and low  frequency sound sources towards a single point on that axis.

Each Tannoy Surrey Series loudspeakers is, therefore, a virtual Sound source. This is widely accepted as the "ideal" loudspeaker type, as all Frequencies that make up the sound you hear will originate from the same point in Space and thus maintain their correct time relationships. The music is clearer and More natural, because the real harmonics and dynamics of instruments and voices remain , while your sound image of the original performance is sharper and more convincing.

If everybody listened to music with an average audio system in an average sized room, then we would make just one type of Dual Concentric loudspeaker. Your System and listening environment, however, are as individual as you; so Tannoy Offers you the choice of five Dual Concentric loudspeakers in the Surrey Series

You can choose from the compact Esher, which uses the smallest ever Tannoy Dual Concentric with an 8" bass cone; or two larger shelf or stand Models, the Darking and the Chartsey. Should you have the space for larger free-Standing loudspeakers, then the top-of-the-range Bradley and Albury models will Give you really outstanding performance. There is a loudspeaker in the Tannoy

Surrey Series that will match your system and enable you to enjoy all the sound Advantages of the Tannoy Dual Concentric System

 

Tannoy Surrey Series loudspeakers

Features:

Free-standing single point source loudspeaker with integral stand

Dual concentric drive unit with Girdacoustic reinforced cone

Overall frame size 420 mm (16,5")

Time compensated crossover

Bass reflex cabinet with walnut veneer finish

Power handling 350 W (peak)

 


Specifications

Recommended Amplifier Power:  50 W - 250 W

Peak Power handling:  350 W

Impedance Nominal/Minimum:  8   /6

Sensitivity Domestic / Anechoic :  95 dB / 92 dB

Frequency Response:  35 Hz - 20 kHz (±3 dB)

Phase Response:  90 Hz - 10 kHz (±12°)

Time Compensation:  better than ±10 µsec 90 Hz - 10 kHz

Dispersion at -6 dB points:  90 ° included angle conical

Crossover Frequency:  1,0 kHz

Crossover Type:  8 Element passive time compensated

Drive Unit:  Tannoy Dual Concentric 3839E, High compliance, Overall frame size: 420 mm (16,5")

Distortion (90 dB at 1 m):  less than 0,5%

Bass Loading :  Offset ducted port

Cabinet Construction:  18/25 mm high density particle board

Finish:  Real Walnut veneers with solid Walnut edgings to base

Grille:  2 piece detachable , Brown cloth on wood frame

Internal Volume:  105 litres

Dimensions (W x H x D):  1000 x 500 x 380 mm (39,4" x 19,7" x 15")

Weight:  33 kg (72,8 lbs)


 

Tannoy Bradley SL65 speakers


Tannoy Surrey Series loudspeakers

Features:

Free-standing single point source loudspeaker with integral stand

Dual concentric drive unit with Girdacoustic reinforced cone

Overall frame size 343 mm (13,5")

Time compensated crossover

Bass reflex cabinet with walnut veneer finish

Power handling 300 W (peak)

 


Specifications

Recommended Amplifier Power:  0 W - 180 W

Peak Power handling:  300 W

Impedance Nominal/Minimum:  8   /6

Sensitivity Domestic / Anechoic :  93 dB / 90 dB

Frequency Response:  38 Hz - 20 kHz (±3 dB)

Phase Response:  100 Hz - 8 kHz (±12°)

Time Compensation:  better than ±15 µsec 100 Hz - 8 kHz

Dispersion at -6 dB points:  90 ° included angle conical

Crossover Frequency:  1,2 kHz

Crossover Type:  8 Element passive time compensated

Drive Unit:  Tannoy Dual Concentric 3128E, High compliance, Overall frame size: 343 mm (13,5")

Distortion (90 dB at 1 m):  less than 0,5%

Bass Loading :  Offset ducted port

Cabinet Construction:  18/25 mm high density particle board

Finish:  Real Walnut veneers with solid Walnut edgings to base

Grille:  2 piece detachable , Brown cloth on wood frame

Internal Volume:  65 litres

Dimensions (W x H x D):  880 x 410 x 380 mm (34,6" x 16,2" x 15")

Weight:  27 kg (59,5 lbs)