Jensen SG-300 Sigma speaker

 Jensen brings you an advanced 12" version of the famous Triaxial loudspeaker

Many years ago Jensen introduced the G-610 Triaxial 3-way loudspeaker, three acoustically and electronically independent loudspeakers in one unitary assembly. It made history as the first 3-way system and embodied the first horn-loaded compression driver supertweeter to be used in a commercial high fidelity loudspeaker. When this 15" speaker was installed in a large enclosure,, the sound was truly awe inspiring.

Now Jensen has created the SG-300 Triax® . It is scaled down in dimensions and will go in a compact shelf-size enclosure. It retains all of the important original concepts, is even more advanced in its use of the Flexair® high-compliance long-travel surround and Syntox-6 magnetic structure in the woofer. 

The Jensen Sigma Series  of  high fidelity unitary loudspeakers offers a comprehensive range of six 12" and three 8" models to suit most every unitary application. This brilliant Series of loudspeakers embodies every advance in acoustic design, every wanted feature of convenience, performance and high reliability.

SG-300 Triax® 12" 3-way unitary loudspeaker

Jensen's newest exclusive, a true 3-way 12" unitary hi-fi speaker. The Flexair® woofer and Syntox-6® magnet structure produce rock-bottom bass to 20 Hz. A low-distortion compression midrange uses the woofer cone as its horn mouth. The cast support bar contains a new horn-loaded compression super-tweeter which delivers response well past 20 kHz. 

Specifications:

Nominal Size:  12”

Power Rating:  30 watts

Frequency Range:  20 – 20,000 Hz

Impedance:  8 ohm

Crossover:  600 Hz, 4000 Hz

Balance Control:  Mid/High Frequency

Woofer Resonance:  25 Hz

Dimensions:  12-3/8” diameter;  8-1/8 deep

Connections:  Push Type Binding post

Weight:  15 lbs (shipping)

Jensen HS-2 headphones

 Jensen HS-2

These unique stereo headphones bring an exciting new dimension to your favorite mono or stereo recordings. You’ll marvel at the smooth, full range, undistorted output.

comfortable to wear, easy to listen to.

Soft foam cushions provide feather weight comfort and preserve the undistorted bass response without pressure. Add pleasure to your personal stereo listening.

Jensen Model HS-2 Stereo Headphones bring an exciting new dimension to your favorite recordings. Unusually smooth full range undistorted output set these headphones apart. Soft foam cushions provide feather weight comfort and preserve the undistorted bass response without pressure. Response is true, complete, distortion-free from below 20 to 17,000 cycles.

HS-2 Stereo Headphones may be connected to any stereo or mono system. A full 8-foot input cable is conveniently located to the rear of the left phone. Of course, it carries the Jensen 5 year hi-fi guarantee. Suggested resale price $24,95.

Specifications

Drivers:  High-Compliance, Maisture resistant diaphragm

Frequency Range:  Below 20 Hz to 17,000 Hz

Power Requirements:  comfortable listening with 1 milliwatt; loud listening with 10 milliwatts

Impedance:  4 Ω  each channel (may be connected to 4- , 8- , or 16- Ω  amplifier outputs)

Terminals:  Standard 3-conductor headphone plug

Cord:  8’ long

Weight:  16 oz (Net); 2 lbs (Shipping)

AKG K-240 headphones

 AKG K-240

Among AKG patents, none is more significant than the Passive Diaphragms found in K-240 (K-340, K-3) models. Mounted within each earpiece, they perform two distinct functions when activated by sound waves. – They are acoustically transparent above 200 Hz, and one listens in a virtually “free field”. Unwanted mid- and high-frequency peaks and valleys of conventional circumaural (closed) headphones are eliminated. Sound enters the ear in a “normal” manner as in supra-aural (open) headphones. –Below 200 Hz, combined with acoustical “screens”, they form a controlled, damped vent to flatten out any bass peaks, thus eliminating boominess common in most circumaural headphones, and extends linear response lower than would otherwise be possible in supra-aural headphones. The result is pure listening pleasure, you hear tone gradations often lost in loudspeakers or in the listening room environment.

The Complete Free-Field Headphone

The K-240 is the first totally sound and comfort engineered headphone incorporating all the features necessary for complete listening enjoyment; accurate stereo imagery, outstanding fidelity of reproduction at all listening levels, extreme comfort with virtually no fatigue under prolonged use, and uncomplicated ease of use.

The Passive Diaphragms

in the K-240, the compliance of the passive diaphragms, combined with acoustical resistances, forms a controlled, highly damped vent to counteract and flatten out the resonant peak. This eliminates boominess down to a lower frequency than would otherwise be possible

The K-240’s unusual construction improves wearing comfort, reduces weight, and totally eliminates annoying user adjustments. Its soft, perforated support band shapes easily to the head and simultaneously self-positions the headphone driver elements comfortably on the ears. At the same time, AKG’s exclusive Cardan (universal-joint gimbal) earpieces automatically, independently, and correctly self adjust to each ear for optimum listening contact.

K-240 utilizes Passive Diaphragms and acoustic “screens” for controlled response and “free field” realism. Dynamic transducers provide accurate reproduction and high output. Universal gimbal (cardan) suspension for each earpiece with self-adjusting headband is comfortable to wear over long periods. Favourite of recording and broadcast studios.

Common to all AKG headphone designs, the circumaural K-240 possesses outstanding features which increase wearing comfort, fit and flexibility of the headphone. Unique self-adjusting headband and cardan-swivels locate the earpieces precisely and accurately regardless of head or ear shape, long-term wearer fatigue is eliminated. Weight is distributed uniformly over wide headbands. In environments where noise could be a problem, circumaural headphones are an ideal selection. And remember, the patented “Passive Diaphragms” yield qualities equal to the most natural listening environment.

Specifications:

Operating Principle:  Dynamic moving coil

Frequency Range:  15 – 20,000 Hz

Sound Pressure Level  (thd 1,0%)

108 dB (at 100 – 2,000 Hz)

112 dB (at 1,000 Hz)

Sensitivity:  20 µb/V

Normal Listening-Level Requirements:  0,5 V (0,4 mW) for 94 dB SPL (=10 uv b)

IHF Sensitivity:  4V (27 mW) for 112 dB SPL (=80 µb)

Nominal Impedance:  600 ohm per system

Maximum Continuous  Input:  11 V (200 mW) =121 dB SPL (per channel)

Total harmonic Distortion:  (at 95 dB SPL):  0,3%

Weight:  224 g (7,9 oz) without cable

Cable Length:  3 m (10 ft) ¼ inch phono plug

Audio Technica AT-701 headphones

 Products of one of the world’s best equipped laboratories for the development of audio and acoustic devices, Audio-Technica headphones bring entirely new levels of reproduction quality and listening enjoyment to the headphone user. Beginning with the acoustic fundamentals, Audio-Technics engineers have brought refreshingly new insights into every aspect of headphone performance.

It is important at the beginning to understand that the design of most conventional headphones is fundamentally incorrect. Most headphones seem to be designed first from a visual standpoint. They are provided with large, impressive ear cups and elaborate-looking headbands. The result is considerable unnecessary weight, an extreme sense of discomfort after only short listening intervals and, most importantly, an unnatural, highly colored sound. The large impressive-appearing ear cups, alas, contribute to severe resonant peaks in frequency response and closed-in-effect.

Audio-Technica headphones are dramatically different from conventional  headphone designs. First, much attention has been paid to keeping total weight extremely low. Likewise the headband is designed to keep the earphones securely in place, yet imparting a minimum of pressure to the head. As a result, Audio-Technica headphones may be worn in complete comfort for any desired period of time.

The acoustic properties of Audio-Technica headphones are likewise highly advanced. The diaphragms are bi-polar radiators. The ear cup provides no restriction to the free movement of the diaphragm; there is no trapped volume of air behind the diaphragm. As a result, higher diaphragm velocities are attained, providing improved transient response and reduced distortion. An “open” feeling is immediately experienced when listening to this type of headphone making conventional, closed-back headphones seem closed-up by comparison. Ambient noise is reduced, permitting complete involvement with the program material, yet the listener is never totally out of contact with the outside world.

Audio-Technica headphones may be used with any standard amplifier or receiver, and dynamic models are provided a convenient coiled cord. Ear pads may be detached readily for replacement if desired.

Model AT-701 Dynamic

Unusually Flat, wide-range response is provided in a model AT-701, also employed a dynamic driver unit of 47 mm diameter. The non-resonant, thermos-formed, polymer diaphragm material offers both stiffness and extremely low mass. Copper plated aluminium wire is used for the voice coil, for minimum mass and excellent electrical characteristics.

Specifications

Frequency Response:  30 – 20,000 Hz

Impedance:  4 – 16 ohms

Sensitivity:  97 dB ±2dB/mW at 1 kHz 

weight:  6,3 oz

Yamaha P-1250 monaural power amp

Yamaha P-series Professional Power Amplifiers P1250 

The power amplifier shall have an input sensitivity of +4 dBn, requiring no more than 1,23 volts RMS to be driven to rated output into a 4 ohm load. The maximum continuous average sine wave power output over a 20 Hz to 20 kHz bandwidth for a single channel shall be (150 watts, 250 watts) onto a minimum 4 ohm load impedance, or (100 watts, 170 watts) into an 8 ohm load with no more than 0,05% thd.

Total harmonic Distortion measured at half rated power, from 20 Hz to 20 kHz, shall be no more than 0,01% . maximum intermodulation distortion, measured using the SMPTE method of 60 Hz and 7 kHz tones mixed in a 4:1 ratio, shall be no more than 0,01% measured at rated power output. Power bandwidth shall be no less than 10 Hz to 50 kHz at half rated power output, and frequency response shall be +0 dB, -1 dB from 10 Hz to 50 kHz. s/n as established by comparing the maximum output with signal to the minimum output noise with a shorted input, shall be no less than 110 dB measured with a -6 dB/octave low pass filter at 12,47 kHz (equal to a “brick wall” filter at 20 kHz), and no less than 115 dB measured with an IHF “A” weighting network. Residual output noise, measured with the input attenuator set at infinite attenuation, shall be no more than _80 dBm with a -6 dB/octave low pass filter at 12,47 kHz, or no more than -90 dBm with an IHF “A” weighting network. Slew rate shall be at least 50 volts per microsecond, full swing.

The amplifier input(s) shall be equipped with both an XLR-3 type connector and a pair of Tip/Ring/Sleeve ¼-inch phone jacks, wired in parallel. The input shall be of the electronically balanced, differential type, with an input impedance of no less than 15 k ohm presented to either balanced or unbalanced sources. The amplifier output(s) shall be equipped with a set of 5-way binding posts for positive, high-current connections, and with parallel-wired Tip/Sleeve 1-4-inch phone jacks for wiring convenience.

Input level shall be adjustable by means of (one or two) detented input attenuator(s) calibrated in 32 steps of from zero to infinite attenuation. The attenuator(s) shall be recessed, and shall be designed so as to be easily adjustable by hand, without any tools. To avoid casual or accidental setting changes, a security cover for the attenuator(s) shall also be provided.

Protection for the speaker load shall be established by means of an output-disconnect relay that is timed out when power is first applied to avoid transients from reaching the load, and that immediately disconnects the load and turns on a front-panel protection indicator in the event that more than 2 volts DC appears across the output. Further protection for the amplifier and load shall be provided by VI limiting circuitry which automatically reduces the power output in the event the load impedance is below 2 ohm for a single channel, (4 ohm for a dual-channel model in bridged mono configuration). The amplifier shall also include a full-time 2-speed fan which operates at high speed under severe thermal stress, and automatically resets to a lower speed as appropriate. Cooling air shall be drawn through a removable cleanable front-panel filter, and exhausted via ports in the tip and side panels of the amplifier.

Signal level indication (per each channel on dual-channel models) shall be provided by two LEDs, one of which turns on when the output THD is equal to or above 1%, which would indicate the onset of clipping, and one which turns on when the output level is equal to or greater than 2 volts RMS, which would indicate the presence of program signal.

Specifications P1250

Power Output Level (THD =0,05%)

20 Hz – 20 kHz :  170 W (at 8 Ω ); 250 W (at 4 Ω )

1 kHz:  185 W (at 8 Ω ); 265 W (at 4 Ω )

Frequency Response:   10 Hz – 50,000 Hz (8 Ω ) +0 -1 dB

Power Bandwidth (THD = 0,1%)

10 Hz to 100,000 Hz (85 W) at 8 ohm

10 Hz to 100,000 Hz (125 W) at 4 ohm

Total harmonic Distortion: 

Less than 0,007% ( 85 W, 20 Hz – 20 kHz, 8 Ω )

Less than 0,003% ( 85 W, 1 kHz, 8 Ω )

Less than 0,005% ( 125 W, 1 kHz, 4 Ω )

Less than 0,01% ( 1255 W, 20 Hz – 20 kHz, 4 Ω )

Intermodulation  Distortion (60 Hz : 7 kHz = 4:1)

less than 0,005% (85 W, 8 Ω )

less than 0,01% (125 W, 4 Ω )

Damping Factor

Better than 110 (1 kHz , 8 Ω ); >55 (1 kHz  , 4 Ω  )

Signal-to-Noise-Ratio: 

Better than 110 dB (Input Short; 12,47 kHz , -6 dB/octave LPF)

Better than 115 dB (Input Short, IHF A Network)

Slew Rate

± 50 V/µsec (8 Ω , Full Swing)

Sensitivity :  +4 dB (1,23 V rms) for nominal output (4 Ω  load)

Voltage Gain:  28,3 dB

Input Impedance:  better than  15 k Ω , Balanced or Unbalanced (Att. Max)

Residual Noise (Input Att. Minimum)

Less than -80 dBm, -6 dB/oct. LPF at 12,47 kHz 

Less than -90 dBm, IHF A network

Indicators

Signal:  Green LED(-20 Hz to 20 kHz, Vo> 2 V

Clipping:  Red LED Total harmonic Distortion: better than 1%

Protection: Red LED (during the protection or muting is on)

Pilot:  Red LED Power ON

Protection Circuits

Muting:  6 ± 2sec After Power ON

DC Sense:  DC ± 2 V Ouptut Voltage

Thermal:  better than 85°C Heat sink temperature

PC Limiter:  ON RL less than 2 Ω 

FAN Circuit

Better than 60°C High speed run, Heat sink temperature

Less than 45°C Restoration of a low speed run, Heat sink temperature

Front Controls:  32 step Input Attenuator (0 to -20 dB in 1 dB steps, -20 to -30 dB in 2 dB steps, then -33, -37, -42, -50, -60 dB, and infinite attenuation

Push ON/Push Off Power Switch

Power Requirements

220/240 V AC 50/60 Hz (General model) 120 V AC, 60 Hz (US and Canada models)

Power Consumption

600 W (General mode); 400 W, 450 VA (US and Canada model)

Dimensions (W x H x D):  480 x 132 x 423 MM (18-7/8” x 5-1/4” x 16-5/8”)

Weight:  15 kg (33 lbs)

 

Yamaha P-1150 monaural power amp

Yamaha P-series Professional Power Amplifiers P1150 

The power amplifier shall have an input sensitivity of +4 dBn, requiring no more than 1,23 volts RMS to be driven to rated output into a 4 ohm load. The maximum continuous average sine wave power output over a 20 Hz to 20 kHz bandwidth for a single channel shall be (150 watts, 250 watts) onto a minimum 4 ohm load impedance, or (100 watts, 170 watts) into an 8 ohm load with no more than 0,05% thd.

Total harmonic Distortion measured at half rated power, from 20 Hz to 20 kHz, shall be no more than 0,01% . maximum intermodulation distortion, measured using the SMPTE method of 60 Hz and 7 kHz tones mixed in a 4:1 ratio, shall be no more than 0,01% measured at rated power output. Power bandwidth shall be no less than 10 Hz to 50 kHz at half rated power output, and frequency response shall be +0 dB, -1 dB from 10 Hz to 50 kHz. s/n as established by comparing the maximum output with signal to the minimum output noise with a shorted input, shall be no less than 110 dB measured with a -6 dB/octave low pass filter at 12,47 kHz (equal to a “brick wall” filter at 20 kHz), and no less than 115 dB measured with an IHF “A” weighting network. Residual output noise, measured with the input attenuator set at infinite attenuation, shall be no more than _80 dBm with a -6 dB/octave low pass filter at 12,47 kHz, or no more than -90 dBm with an IHF “A” weighting network. Slew rate shall be at least 50 volts per microsecond, full swing.

The amplifier input(s) shall be equipped with both an XLR-3 type connector and a pair of Tip/Ring/Sleeve ¼-inch phone jacks, wired in parallel. The input shall be of the electronically balanced, differential type, with an input impedance of no less than 15 k ohm presented to either balanced or unbalanced sources. The amplifier output(s) shall be equipped with a set of 5-way binding posts for positive, high-current connections, and with parallel-wired Tip/Sleeve 1-4-inch phone jacks for wiring convenience.

Input level shall be adjustable by means of (one or two) detented input attenuator(s) calibrated in 32 steps of from zero to infinite attenuation. The attenuator(s) shall be recessed, and shall be designed so as to be easily adjustable by hand, without any tools. To avoid casual or accidental setting changes, a security cover for the attenuator(s) shall also be provided.

Protection for the speaker load shall be established by means of an output-disconnect relay that is timed out when power is first applied to avoid transients from reaching the load, and that immediately disconnects the load and turns on a front-panel protection indicator in the event that more than 2 volts DC appears across the output. Further protection for the amplifier and load shall be provided by VI limiting circuitry which automatically reduces the power output in the event the load impedance is below 2 ohm for a single channel, (4 ohm for a dual-channel model in bridged mono configuration). The amplifier shall also include a full-time 2-speed fan which operates at high speed under severe thermal stress, and automatically resets to a lower speed as appropriate. Cooling air shall be drawn through a removable cleanable front-panel filter, and exhausted via ports in the tip and side panels of the amplifier.

Signal level indication (per each channel on dual-channel models) shall be provided by two LEDs, one of which turns on when the output THD is equal to or above 1%, which would indicate the onset of clipping, and one which turns on when the output level is equal to or greater than 2 volts RMS, which would indicate the presence of program signal.

Specifications P1150

Power Output Level (THD =0,05%)

20 Hz – 20 kHz :  100 W (at 8 ohm); 150 W (at 4 Ω )

1 kHz:  105 W (at 8 Ω ); 165 W (at 4 Ω )

fr:  10 Hz – 50,000 Hz (8 Ω ) +0 -1 dB

Power Bandwidth (THD <=0,1%)

10 Hz to 100,000 Hz (55 W) at 8 Ω 

10 Hz to 100,000 Hz (75 W) at 4 Ω 

Total harmonic Distortion: 

Less than 0,007% ( 55 W, 20 Hz – 20 kHz, 8 Ω )

Less than 0,003% ( 55 W, 1 kHz, 8 Ω )

Less than 0,005% ( 75 W, 1 kHz, 4 Ω )

Less than 0,01% ( 75 W, 20 Hz – 20 kHz, 4 Ω )

Intermodulation  Distortion (60 Hz : 7 kHz = 4:1)

less than 0,005% (55 W, 8 Ω )

less than 0,01% (75 W, 4 Ω )

Damping Factor

Better than 110 (1 kHz , 8 Ω ); better than 55 (1 kHz  , 4 Ω )

Signal-to-Noise-Ratio: 

Better than 110 dB (Input Short; 12,47 kh z, -6 dB/octave LPF)

Better than 115 dB (Input Short, IHF A Network)

Slew Rate

± 50 V/µsec  (8 Ω , Full Swing)

Sensitivity :  +4 dB (1,23 V rms) for nominal output (4 Ω  load)

Voltage Gain:  26,0 dB

Input Impedance:  better than  15 k Ω , Balanced or Unbalanced (Att. Max)

Residual Noise (Input Att. Minimum)

Less than -80 dBm, -6 dB/oct. LPF at 12,47 kHz

Less than -90 dBm, IHF A network

Indicators

Signal:  Green LED(-20 Hz to 20 kHz, Vo better than  2 V

Clipping:  Red LED Total harmonic Distortion: better than 1%

Protection: Red LED (during the protection or muting is on)

Pilot:  Red LED Power ON

Protection Circuits

Muting:  6 ± 2sec After Power ON

DC Sense:  DC ± 2 V Ouptut Voltage

Thermal:  better than 85°C Heat sink temperature

PC Limiter:  ON RL less than 2 Ω 

FAN Circuit

Better than 60°C High speed run, Heat sink temperature

Less than 45°C Restoration of a low speed run, Heat sink temperature

Front Controls:  32 step Input Attenuator (0 to -20 dB in 1 dB steps, -20 to -30 dB in 2 dB steps, then -33, -37, -42, -50, -60 dB, and infinite attenuation

Push ON/Push Off Power Switch

Power Requirements

220/240 V AC 50/60 Hz (General model) 120 V AC, 60 Hz (US and Canada models)

Power Consumption

400 W (General mode); 250 W, 300 VA (US and Canada model)

dimensions (W x H x D):  480 x 132 x 423 MM (18-7/8” x 5-1/4” x 16-5/8”)

Weight:  13 kg (28,6 lbs)

 

Yamaha A-420 amplifier

Center Defeat Bass and Treble Tone Control

The bass and treble controls provided on A-420 are specially designed with a center defeat position. When set to their center positions, tone control response is perfectly flat, with no influence on the original signal. When tuned for either a boost or cut, they provide smooth, accurate response over a conveniently wide range.

Subsonic Filter

A switchable subsonic filter is provided on the A-420, a subsonic filter is built into the phono equalizer amplifier stage, providing the same performance benefits automatically, whenever the amplifier is reproducing a phono source.

Independent Speaker A/B Selectors

The A-420 provide rear panel connectors and front panel selectors for two separate pairs of speakers. They can be driven independently or simultaneously, allowing you to drive two remotely located speaker pairs together, or to drive a dual speaker pair setup in a single listening environment, for more listening flexibility.

Specifications

Minimum RMS Output Power per Channel:  50 Watts (8 Ω ) from 20 to 20,000 Hz at no more than 0,015% thd

Dynamic Power per Channel (IHF) :  85 W (8 Ω ), 115 W (4 Ω ), 120 W (2 Ω )

Power Bandwidth (Half Rated Power, 8 Ω ):  10 to 50,000 Hz  (0,05% THD)

Damping Factor (1 kHz, 8 Ω ):  no more than 50

Input Sensitivity/Impedance

Phono MC :  160 µV/100 Ω 

Phono MM :  2,5 mV/47 k Ω  

CD, Video, Tape :  150 mV/30 k Ω 

Maximum Input Level

Phono MC :  11 mV (0,02% THD)

Phono MM :  155 mV (0,02% THD)

Output Level /Impedance

Rec Out :  150 mV/600 Ω 

Headphone Jack Rated Output/Impedance (8 Ω ):  0,7 V (0,015% THD)/220 Ω 

Frequency Response: 

CD, Video, Tape :  20 to 20,000 Hz +0 dB -0,5 dB

RIAA Equalization Deviation (20 to 20,000 Hz)

Phono MC RIAA :  ± 0,8 dB 

Phono MM RIAA :  ± 0,5 dB 

Total harmonic Distortion: 

Phono MC to Rec Out (3 V) :  0,01%

Phono MM to Rec Out (3 V) :  0,007%

CD, Video, Tape  to Sp Out :  0,01%

Intermodulation Distortion (8 Ω )

CD, Video, Tape :  0,005% (1 W), 0,01% (half Rated Power)

Signal-to-Noise-Ratio:  (IHF-A Network)

Phono MC (500 µV  input Shorted) :  74 dB 

Phono MM (5 mV  input Shorted) :  90 dB 

CD, Video, Tape (input Shorted) :  100 dB 

Signal-to-Noise-Ratio:  (new IHF)

Phono MC (500 µV  input Shorted) :  72 dB 

Phono MM (5 mV  input Shorted) :  76 dB 

CD, Video, Tape (input Shorted) :  85 dB 

Tone Controls

Bass Boost/Cut :  ± 10 dB at 20 Hz

Turnover Frequency :  350 Hz 

Treble Boost/Cut :  ± 10 dB at 20 kHz

Turnover Frequency :  3,5 kHz

Loudness Control (Level Related Equalization):  -20 dB

Dimensions (W x H x D):  435 x 112 x 327 mm (17-1/8” x 4-3/8” x 12-7/8”)

Weight:  5,9 kg (13 lbs)

 

Yamaha A-520 amplifier

Yamaha A-520 amplifier

Rec Out Selector with Tape Copy Function

The Yamaha Rec Out Selector is another extremely useful feature which greatly extends the source control capability of the A-520. It allows you to record one source, selected by the Rec Out Selector, while monitoring another completely independent source selected by a front panel input selector. And the Rec Out Selector also allows you to copy tapes between the two tape inputs, in either direction, eliminating the need for complicated re-connections when dubbing tapes between two decks.

Accessory Output Loop

The growing use of graphic equalizers and sound processors in an audio system presents the need for extra connection capability, and a simpler way to make the right connections. The A-520 is prepared for this need with a rear panel accessory output loop. Serving the same role as a tape loop which would otherwise have to be used, it routes a line level signal out to an external graphic equalizer or sound processor and back in to the amplifier. This frees both existing tape loops provided on the amplifier for their intended purpose, and allows easy connection of an external component without interfering with existing rear panel input/output connections.

Heavy Duty Speaker Connection Terminals

the rear panel speaker connection terminals on the A-520 are specially designed to accept speaker cable of maximum thickness with a simple, solid connection. This allows the use of the heaviest gauge speaker cable for maximum signal transmission purity without having to cut or squeeze the cables in, and provides a solid electrical connection that can’t be pulled out. Normal gauge speaker cables can also be used with the same terminals.

Center Defeat Bass and Treble Tone Control

The  bass and treble controls provided on A-520 are specially designed with a center defeat position. When set to their center positions, tone control response is perfectly flat, with no influence on the original signal. When tuned for either a boost or cut, they provide smooth, accurate response over a conveniently wide range.

Subsonic Filter

A  switchable subsonic filter is provided on the A-520 front panel, allowing you to filter subsonic frequency content such as turntable rumble out of the signal, thereby protecting both amp and speakers and preventing needless power drain.

Independent Speaker A/B Selectors

The  A-520 provide rear panel connectors and front panel selectors for two separate pairs of speakers. They can be driven independently or simultaneously, allowing you to drive two remotely located speaker pairs together, or to drive a dual speaker pair setup in a single listening environment, for more listening flexibility.

Specifications

Minimum RMS Output Power per Channel:  75 Watts (8 ohm) from 20 to 20,000 Hz at no more than 0,01% thd

Dynamic Power per Channel (IHF) :  97 W (8 ohm), 169 W (4 ohm), 160 W (2 ohm)

Power Bandwidth (Half Rated Power, 8 ohm):  10 to 50,000 Hz  (0,03% THD)

Damping Factor (1 kHz, 8 ohm):  no more than 50

Input Sensitivity/Impedance

Phono MC :  160 µV /220 ohm

Phono MM :  2,5 mV /47 k ohmn

CD, Video, Tape :  150 mV/47 k ohm

Maximum Input Level

Phono MC :  10 mV (0,01% THD)

Phono MM :  150 mV (0,01% THD)

Output Level /Impedance

Rec Out :  150 mV/470 ohm

Headphone Jack Rated Output/Impedance (8 ohm):  0,7 V (0,01% THD)/270 ohm

Frequency Response: 

CD, Video, Tape :  20 to 20,000 Hz +0dB -0,5 dB

RIAA Equalization Deviation (20 to 20,000 Hz)

Phono MC RIAA :  ± 0,3 dB 

Phono MM RIAA :  ± 0,2 dB 

Total harmonic Distortion: 

Phono MC to Rec Out (3 V) :  0,007%

Phono MM to Rec Out (3 V) :  0,003%

CD, Video, Tape  to Sp Out :  0,005%

Intermodulation Distortion (8 ohm)

CD, Video, Tape :  0,005% (1 W), 0,01% (half Rated Power)

Signal-to-Noise-Ratio:  (IHF-A Network)

Phono MC (500 µV  input Shorted) :  75 dB 

Phono MM (5 mV  input Shorted) :  92 dB 

CD, Video, Tape (input Shorted) :  100 dB 

Signal-to-Noise-Ratio:  (new IHF)

Phono MC (500 µV  input Shorted) :  74 dB 

Phono MM (5 mV  input Shorted) :  78 dB 

CD, Video, Tape (input Shorted) :  84 dB 

Tone Controls

Bass Boost/Cut :  ± 10 dB at 20 Hz

Turnover Frequency :  350 Hz 

Treble Boost/Cut :  ± 10 dB at 20 kHz

Turnover Frequency :  3,5 kHz

Loudness Control (Level Related Equalization):  -40 dB

Dimensions (W x H x D):  435 x 136 x 338 mm (17-1/8” x 5-3/8” x 13-3/8”)

Weight:  7,5 kg (16 lbs 8 oz)

 

Scientific Fidelity Tesla loudspeakers

Scientific fidelity Tesla

Tesla’s Name

Tesla is named after Nichola Tesla, the only man to understand electricity in his soul. He was the inventor of A/C electricity, making transformers and therefore long distance energy transmission possible. George Westinghouse gave him his start, Thomas Edison took credit for most of his inventions, and J. P. Morgan ( the owner of General Electric at the time) crushed him.

He died a broken and forgotten man.

this speaker is dedicated to him.

Tesla’s woofers

The woofers that are used in Tesla are Scientific Fidelity’s own Design, employing many unique features.

Long throw-soft suspension design

To avoid dynamic compression (the problem of having less and less relative bass the louder you turn it up), which is caused by the woofer’s increasing stiffness as it gols through its travel, a very long voice coil and a soft compliant suspension have been selected.

R.I.D.S.

the aforementioned system simply consists of two foam gaskets (one in front of the woofer frame and one behind it), and a compression ring to hold the woofer against the cabinet so that no part of the woofer frame touches the cabinet.

Carbon Fiber Cone

carbon fiber is very strong, yet lightweight, when woven into cloth, soaked in resin and then pressed into a cone shape it becomes an extremely rigid piston.

Aluminum Phase Plug

by extending the pole-piece completely through the voice coil to the front of the speaker, heat is conducted away from the voice coil in both directions (providing a highly conductive material, such as aluminum, is used) and power handling is greatly increased.

High Loss Norsorex Surround

a high loss surround not only flexes freele at low frequencies but also absorbs energy at high frequencies so that it damps any edge ringing norsorex is currently one of the best materials for this purpose

Edge-Wound Copper Ribbon Voice Coil

ribbon wire is superior for conducting heat away from the center of the voice coil. It also puts more conductor in the gap than any other type of wire.

Tesla’s Finish

Tesla’s beautiful wood finishes (Rosewood, Teak and Ash) are all obtained using obiche wood. Obiche is a fast growing tree from the country of Cameroon, which has some of the best forest management in the world. In Cameroon, 80% of their forests are protected by law. Only 20% are open for commercial production, and in that 20% only one obiche tree is allowed to be cut per acre per year, and that tree must be over 200 inches in circumference.

This is a sustainable process so long as the trees are cut in this manner three will always be obiche trees.

Specifications

Type:  floor-standing , two-way, reflex-loaded,

Speakers Configuration:  D'Appolito- type, woofer-tweeter-woofer configuration.

Drivers:

Low  Frequency :   two 6.5" bass-midranges

High Frequency : 1" Vifa aluminum-dome tweeter

Frequency Response:  32 Hz – 35 kHz +-3 dB

Sensitivity:  88 dB (1 W/1 m)

Impedance:  8 Ω 

Crossover Frequency:  1000 Hz

Power Requirements:  20 Watts or more

Dimensions (H x W x D):   49” x 8” x 13”

Weight:  22,68 kg (50 lbs)

 

Elac 1 Series 105 speakers

Good style has a name, and costs almost nothing.

For µsec, music is an indispensable part of life, happiness. Joy, relaxation, social medium. In your living room, it is not only musical excellence that makes quality, but also the physical presence of the loudspeakers; they must be beautiful, modern and easy to integrate, and  - affordable.

The new 1 Series unites all the virtues of loudspeaker culture:

Natural sound, individual design, advanced technology.

For the 1 Series, new drive units have been developed : tweeters whose wave guide models especially the horizontal dispersion and lends the loudspeaker a dynamic outward appearance; woofers that show the Elac design classic - the aluminum membrane - in an anodised version for the first time.

Graceful floor standing speakers and compact monitors provides adequate set up options for any room - as a home theatre set, or as a classical stereo set.

Elac 105

Graceful 2-way floor-standing speaker with elegant driver style through anodised aluminium woofers and dynamically curved wave guide of the tweeter.

Specifications

Type: 2-way bass reflex d'Appolito configuration

Drivers:

low Frequency :  2 x 140 mm Midrange-Woofer

High Frequency :  1 x 24 mm tweeter

Crossover Frequency:  3,800 Hz

Nominal Power:  80 W, 

Music Power:  120 W

Impedance: 4 Ohm

Frequency Response:  40 - 22,000 Hz

Efficiency:  86 dB

Recommended Amplifier Power:  20 - 150 W

Dimensions (W x H x D):  900 x 180 x 252 mm

weight:  11.4 kg

Finishes: matt black, silver, cherry