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





Technics SB-F2 speakers

SB-F2 
2-way speaker system
75 watt music power handling capacity
12 cm woofer unit with high energy magnet structure
Horn tweeter with 19 mm diaphragm and 2-piece horn construction
Specially designed crossover network for linear phase response
Mounting options; angle bracket (SH-S2)

Input Power:  75 W (music); 50 W (DIN)
Impedance:  8 ohm
Output Level:  88 dB/W/1m
Frequency Range:  48 Hz - 20 kHz (-16 dB)
Crossover Frequency:  3.500 Hz
Dimensions (W x H x D):  138 x 254 x 157 mm
Weight:  3,3 kg

Technics SB-F1 speakers

SB-F1 
2-way speaker system
60 watt music power handling capacity
10 cm woofer unit with high energy magnet structure
Horn tweeter with 13 mm diaphragm and 2-piece horn construction
Specially designed crossover network for linear phase response
Mounting options; tripod stand (SH-S1), angle bracket (SH-S2), suspension chain (SH-S3)

Input Power:  60 W (music); 40 W (DIN)
Impedance:  8 ohm
Output Level:  86 dB/W/1m
Frequency Range:  50 Hz - 20 kHz (-16 dB)
Crossover Frequency:  4.000 Hz
Dimensions (W x H x D):  118 x 210 x 126 mm
Weight:  2,3 kg

Jamo K-20 speakers

This small practical loudspeaker has been designed for use as an extension unit in the kitchen, bedroom, office or workshop, or as part of an intercom system. With muting device and volume control combined in one switch, it can be conveniently turned down when the phone or doorbell rings. Even this small speaker has an overload protection which allows it to be connected to a high power system without risk of burning out.

Technical Data:
System:  1-way
Frequency Range:  50 - 15,000 Hz
Impedance: 4 - 8 Ω
Overload:  15 W
Power Handling:  50 W
Dimensions:  300 x 200 x 110 mm
Weight:  2,2 kg

The Fisher XP-33 speakers


The Little Giant Speaker System is moderately priced, yet suitable for use with any high fidelity system. Its attracyive walnut frame and matching grille blend perfectly with any room decor. For those "problem" installations with severe space limitations, the Fisher Little Giant is unquestionably the first and only choice.
Here is a bone tide advancement of the state-of-the-art; the smallest high-efficiency speaker system ever designed. Into a space slightly larger than a shoebox, Fisher engineers have built a heavy-duty 6-inch bass speaker, a 2-1/2-inch treble speaker, and a capacitance-resistance-type network with crossover at 2,000 Hz.
The bass speaker has a 2-pound magnet structure, a half-roll surround and an aluminum core, one-inch-diameter voice coil. Free-air resonance is a low 35 Hz. The high-frequency speaker has a unique plasticized-surround and polyurethane center for precise definition of "highs", without the shrillness associated with compact systems using artificial correctives.

Specifications
Frequency Response:  38  - 18,500 Hz
Recommended Amplifier Power:  10 - 20 watts
Low Frequency Speaker:
Diameter :  6 inch
Resonance :  35 Hz
Magnat Structure :  2 pounds
Voice Coil Diameter :  1 inch
High Frequency Speaker:
Diameter :  2-1/2 inch
Voice Coil Diameter :  8/16 inch
Magnet Structure :  1/4 pound
Dispersion :  120 degrees
Crossover Frequency:  2,000 Hz
Impedance:  8 ohms
Dimensions (W x H x D):  7" x 13" x 6"
Wight:  10 pounds
Cabinatry:  Available in Walnut
Can be used Horizontally or Vertically

The Fisher XP-55 speakers

Compact Free-Piston Speaker System
Though it measures only 20" by 10" by 9" deep, the Fisher XP-55 incorporates a bass speaker that is very close to that of large speakers and at the same time free of artificial correctives like shaping networks that after the bass output of the amplifier.
This is an 8-inch unit with a magnet structure weighing 3 pounds, a flux density of 12,500 gauss and a totally new suspension system utilizing a long-throw jnverted half-roll surround. Free-air resonance is 33 Hz, an almost incredible figure for an 8" driver. The 2-1/2 inch tweeter has a new low-mass cone made of a combination of the usual fibrous materials resulting in peak-free response out to 19,000 Hz without coloration.
The completely enclosed baffle is heavily damped with Acoustiglas packing. The result is fundamental bass response down to 37 Hz, without doubling.

Specifications
Frequency Response:  37 - 19,000 Hz
Recommended Amplifier Power:  10 - 30 watts
Low Frequency Speaker:
Diameter ;  6 inch
Resonance ;  33 Hz
Magnat Structure :  3 pounds
Voice Coil Diameter ;  1-1/4 inch
High Frequency Speaker:
Diameter :  2-1/2 inch
Voice Coil Diameter :  8/16 inch
Magnet Structure :  1/2 pound
Crossover Frequency:  1,000 Hz
Impedance:  8 ohms
Dimensions (W x H x D):  10" x 20" x 9"
Wight:  20 pounds
Cabinatry:  Available in Walnut
Can be used Horizontally or Vertically

Bose Model 802 loudspeaker

Model 802 Loudspeaker System
The Bose Model 802 represents the most significant advance in professional loudspeaker systems since Bose first introduced its revolutionary Model 800. incorporating a number of major departures from traditional loudspeaker design, the 800 series has since become the standard among professionals who demand systems which produce the cleanest, most natural sound.
The Model 802 utilizes a multiple array of matched, full-range drivers. Their close acoustical coupling results in a smoothing and broadening of individual driver resonances, producing an unusually transparent and detailed sound. The full-range driver concept also eliminates the need for a crossover, thereby eliminating crossover coloration and yielding a sound which has exceptional clarity and realism.
In each Model 802 enclosure, the eight drivers are mounted on four separate facets for smooth dispersion. Dual reactive air columns greatly increase the bass output, while lowering distortion by reducing cone excursion at low frequencies. A unique impedance control circuit, internal to the cabinet, lowers the high-frequency power requirements by reducing the slope of the impedance - versus - frequency curve.

Excellent transient response is achieved though the use of relatively light cones powered by massive magnetic structures. The smooth frequency response and excellent spatial properties of the multiple-driver design also permit performers to work very close to the speakers without causing feedback problems.
Each driver incorporates an edge-wound, aluminum ribbon voice coil for exceptional efficiency and power-handling capacity.efficiency is further enhanced though the use of a 12-ounce ceramic magnet and a reinforced polymer frame, which reduces magnetic flux leakage.
Matched equalization not incorporated into other professional loudspeaker systems, is tailored to the acoustics of the Model 802 and assures full frequency range performance. The new Model 802-E active equalizer provides extremely detailed equalization for smooth, wide response. Phone jacks and XLR connectors allow a choice of unbalanced or balanced inputs. The 802-E's output circuit will drive high-impedance or 600 Ω lines.

Braun TG 1000 open-reel deck


The TG 1000 operates in any position, it has a space for a fourth head in its plug-in head assembly. The additional head can be used as 4-track play back head or be used for slide synchronizing. There is a remote control unit TGF3 available for all functions. All US-plugs. All headphones with impedances from 5 - 2000 ohms can be driven to full volume. Sound on sound; echo; tape monitoring are provided. The counter has 4 digits, and the unique new TB 1022 low noise, high output tape eliminates the need for 10,5" reels. The TG 1000 holds 3300 ft of tape om its 8-3/4" reels. The tape drive with the electronic tension control is so gentle and foolproof that even triple play tape may be used. The built in cable driver and the wide dynamic range input circuitry permit flexibility at the interfaces to amplifiers and microphones. The level meters are peak reading for fast response. The robust construction is very compact and fully modular. All circuitry is silicon solid state.

Features
3 motors (one brushless DC-servo motor, 2 AC-servo motors)
3 speeds: 7-1/2; 3-3/4; 1-7/8
2 track or 4 track
3 or 4 professional heads (chevron-technique in 2 track version)
Electronic tape tension control on both reels
Electro-mechanical brakes for fast smooth action
Pre-adjusted plug-in head assembly
Modular construction and all silicon circuitry
All functions relay controlled and solenoid actuated
Noisefree "pause" button for tape editing
Built-in tape solicer, 4 (2) input mixer, 4-digit counter
Feather-touch push-buttons, fully fool proof
Multiplay and "off the tape" monitoring
Built-in cable driver (1 volt, 600 ohms)
Slide synchronizer (optional0 and adjustable head phone outputdrive and brake system allows use of triple play tape.
Operation in any position
Optional remote control unit for all functions

Specifications:
Frequency Response (minimum DIN 45511)
20 - 25,000 Hz at 7-1/2 lps ±2,5 dB
20 - 15,000 Hz at 3-3/4 ips ±2,5 dB
20 - 8,000 Hz at 1-7/8 ips ±2,5 dB
Signal-to-Noise Ratio two track, DIN 45505)
60 dB at 7-1/2
60 dB at 3-3/4
57 dB at 1/7/8
Distortion at "0" dB (DIN 45405) VU-meter reading:
0,6% at 7-1/2
0,7% at 3-3/4
0,8% at 1-7/8
Wow and flutter 9din 45507)
Less than 0,05% at 7-1/2
Less than 0,09% at 3-3/4
Less than 0,25% at 1-7/8
Rewind time:  90 sec for 3300 ft
Dimensions :  17,7" x 12,6" x 5,3"
Weight:  44 lbs


Braun PS 600 turntable


Turntable Features
Motor - new electronically-controlled brushless DC motor with Hall commutator
Power transmission - direct rumble-free friction drive
Platter - dynamically balanced platter of 11-3/4" diameter and 5,5 lbs (2,5 kg) weight with rimmed record mat
Speed selector - 33-1/3, 45, 78 rpm
Mode selctor - 4 push buttons
Poitch control - ±3,5% of nominal speed
Stroboscope - illuminated strobe for all three speeds
Cueing control - hydraulically-damped, activated by lever, the smoothest in industry
Suspension - hydraulic suspension with very low resonance frequency for optimum resistance to shock and acoustic feed-back
10-record changer mechanism
Tonearm features
Construction - warp-free aluminum tubing with elastically-coupled counter weight
Bearings - precision instrument ball bearings for vertical and horizontal support
Balancing - tone arm balanced all three planes
Tracking force - adjustable from 0-4 grams by calibrated spring
Tone arm - resonance frequency less than 10 Hz
Antiskating control - separate calibraated dial for compensation of skating force
Tone arm length - 8-3/4" effective length
Tracking error horizontal - 0,2° maximum/cm tracking radiu
Caartridge shell - interchangeable with 4 pin precision quick connector. Suited for all 1/2" cartridges. Overhang adjustable.
Tracking angle Vertical - switch for error compensation on cartridge shell for single play or in changer use.

Specifications:
Rumble :  65 dB or better
Wow and Flutter:  0,07% or better
Semiconductors:  9 Transistors; 8 Diode;
Power Requirement:  117/220 V AC 50/60 Hz
Dimensions (W x H x D): 430 x 195 x 320 mm
Weight:  11,7 kg

Thiel CS.5 speakers

The CS.5 is a Two-way ported, floor-standing loudspeaker offering high performance in a compact, easy-to-place cabinet and at an entry-level price. Completely time and phase coherent, the CS.5 provides a dimension of clarity and realism that conventional speakers in its price class cannot achieve, making it ideal for both music and video sound.
The CS.5 incorporates many of the same design techniques used in other Thiel, speakers to achieve our goal of accurate musical reproduction in all areas of performance. The drivers are positioned along a sloping front baffle for correct time alignment, and the crossover is designed to provide phase accurate transitions between the drivers. These two design features alone result in an unusually high level of spatial and transient fidelity for a speaker of this price. A specially shaped grillboard decreases diffraction for more open sound, and the heavy cabinet construction reduces unwanted vibration to improve clarity and imaging.

Quality construction and materials.
The CS.5 uses the same quality materials as the more expensive Thiel models - a die cast magnesium woofer chassis, polypropylene or polystyrene capacitors, and rigid 1-inch thick cabinet walls.
Tweeter
The 1-inch metal dome tweeter uses a large magnet, vented pole, and reinforced rear chamber to allow a low resonance frequency and a wide bandwidth. The result is high frequency reproduction of great clarity and realism.
Woofer
The Thiel-designed 6,5-inch, treated paper cone woofer incorporates the same short coil/long gap motor design as other Thiel woofers for low distortion, very good midrange performance, and clean bass response. The woofer is magnetically shielded to prevent video image distortion.
Specifications
Recommended Power Amplifier:  30 - 150 watts
Driver Complement:
Woofer ;  6,5 " (5" radiating area) with treated paper cone, cast frame, 1" diameter voice coil. Underhung coil (short coil/ long gap) motor system. Linear travel 1,4" pk-pk. Two magnets with total weight of 1,4 lb. Copper pole sleeve
Tweeter :  1" aluminum dome with short coil, ferrofluid, vented pole to rear chamber, reinforced chamber cup.
Bandwidth:  55 Hz - 20 kHz (-3 dB)
Amplitude Response:  55 Hz - 20 kHz ±3 dB
Phase Response:  ±10° minimum
Sensitivity:  87 dB at 2,8 V/ 1m
Impedance:  4 Ω, (3,2 Ω minimum)
Dimensions (W x H x D):  8" x 31" x 11"
Weight:  35 pounds

Akai AA-910 receiver

Solid State FM/AM MPX Stereo Tuner Amplifier
Stereo Tuner Amplifier AA-910
The AA-910 receiver is the first release of Akai's new AA-900 Series. Smart and sleek, but robust styling gives this model a "dignified" look. Ideally positioned front panel controls for complete operating ease and efficiency. Space-age circuits for quality stereo sound  at 50 W music power.
Specifications
Amplifier Section
Output : 2 x 12 W at 8 Ω (distortion 1%)
Frequency Response:
Phono :  RIAA ±1,5 dB
Aux :  20 Hz - 50 kHz +1 -2 dB 
Input Sensitivity: 
Phono :  2m2 mV (-51 ±1,5 dB)
Aux :  110 mV (-17 ±1,5 dB)
Tape :  110 mV (-17 ±1,5 dB)
Signal-to-Noise Ratio: 
Phono :  better than -37 dBm
Aux :  better than -47 dBm
Tape :  better than -47 dBm
Residual Noise:  1,1 vm (less than -57 dBm)
Tone control
Bass :  ±9,5 dB at 100 Hz ±1,5
Treble :  ±10 dB at 10 kHz ±1,5
Loudness Control:  9 dB at 100 Hz ±1,5 ; 4 dB at 10 kHz  ±1,5
Cross Talk:  better than 50 dB  (Phono 1 kHz)
L-R Deviation:  within 3 dB Phono
Recording Output
110 mV (-17 ±2dB)  PIN
22 mV (-31 ±2 dB) DIN
FM Tuner Section
Frequency Raange:  75 to 91 MHz ±1 (J);  86 to 109 MHz ±1 (U)
Dial Tracking Error:  ±250 kHz
Sensitivity (IHF):  2 µV  (3,2 µV)
Sensitivity Deviation:  within 3 dB
Image Rejection Ratio:  65 dB ("J" better than 40 dB ; "U" better than 45 dB)
IF Rejection Ratio:  90 dB ("J" better than 85 dB ; "U" better than 80 dB)
Capture Ratio (IHF):  2,5 dB (less than 2 dB)
Limiting Sensitivity:  less than 10 dB
Selectivity:  65 dB (better than60 dB)
AM Suppression Ratio:  better than 45 dB
Signal-to-Noise Ratio:  70 dB
Stereo :  better than 45 dB
Monarual :  better than 60 dB
Distortion Factor
Stereo :  0,8% (less than 2%)
Monarual :  0,4% (less than 0,5%)
Frequency Response:  -13 ±1 dB at 10 kHz (J);  -11 ±1 dB at 10 kHz (U)
Stereo Sensitivity:  45 µV (33 ±3 dB)
Stereo Separation:  40 dB (better than 33 dB)
Rejection ratio:  better than 45 dB
L-R Deviation:  within 3 dB
Recording output:
150 mV (-14  ±2 dB) PIN
24 mV (-30 ±2 dB) DIN
AM Tuner Section
Frequency Range:  525 kHz to 1650 kHz
Dial Tracking Error:  within 2%
Sensitivty (IHF):  450 µV
Sensitivty Deviation:  within 6 dB
Image Rejection Ratio:  55 dB (better than 50 ad at 1 MHz)
IF Rejection Ratio:  better than 45 dB at 1 MHz
Selectivity:  better than 30 dB ±10 kHz
Signal-to-Noise ratio:  50 dB (better than 40 dB)
Distortion Factor:  1% (less than1,5%)
Frequency Response:  -15 dB at 3 kHz
Recording Output: 
150 mV (-14 ±2 dB) PIN
24 mV (-30 ±2 dB)  DIN
General Section
Semiconductors:  29 Transistors, 2 IC's; 12 Diodes; 2 Zener Diodes;2 Varistors; 2 Thermisters
Power Source:  100 to 240 V 50/60 Hz
Power Consumption:  100 W
Dimensions (W x H x D):  457 x 168 x 368 mm (18" x 6,6" x 14,5")
Weight:  10,5 kg (23,1 lbs)

Akai GX-635D reel-to-reel

Making It An Even Better System: A new GX head
A system that uses a head for each function as that of the GX-635D does would not be nearly as advantageous if the head were not of superb quality as well. With Akai's improved GX head, there's no worry on this point.
Made from low-noise crystal ferrite and superb-hard glass, the GX head is incredibly durable. And its new design has totally eliminated the contour effect, thus flattening frequency response at low ranges for much clearer bass sounds. The system as a whole maintains the ideal head gap for each function, improving head sensitivity and eliminating sound drop-out. What all these things add up to are  a better dynamic range and longer, trouble-free service life than possible with other heads. Not only do you get better performance, you receive economic savings as well.

Even the Transport System's new
A lot of study has gone into making this deck worthy of its top-line rank. Accordingly, one of the parts that has been radically changed is the tape transport system.
As you can see, its shape is different from that of other systems. That's because it has been made to conform to the optimum travel path of the tape. Thus the heads touch the tape at just the right spot, assuring the best recording and playback results. This improvement has been accomplished by the addition of two guide rollers, one on each side. And these rollers have been coated with rubber so that vibrations that would normally reach the head block are absorbed. The rubber also pre vents tape slip during transport. Which brings us to another plus of this system stable and steady tape travel. The parts that assure this-new, improved motor, GX heads and tension arms - are introduced hereafter.
One-way, Oil-damped tension Arms
The QX-635D employs one-way, oil-damped tension arms that assure normal transport speed is reached immediately after start. By the use of springs, they allow no tag that could damage your otherwise professional-style recordings. And, they feature a lock mechanism that makes it all the easier for you to thread the tape.

Three-motor, Direct Capstan Drive System
The best thing about this system is what you don't get rubber belts,idlers and other such parts that, in conventional systems, tended to produce vibration and wear. This, along with the fact that a separate motor is  used for each reel as well as for the capstan, ensures that the tape is transported smoothly at a fixed speed during both recording and playback. Longer service with a lower wow and flutter characteristic 9an incredible 0,03% WRMS) is the result.

The new C.P.G. AC Servo Capstan Motor
The capstan performsone of the most important functions in a tape deck, transpotrion of the tape. To guarantee this function is performed perfectly smoothly and steadlly. Akai has developed a new motor for the capstan drive. In the servo circuit of this motor, a Sample-and Hold circuit, is employed. The effect of this is to improve the response characteristics of the servo so that regular speed is always maintained and vibrations emanating from the motor are reduced.

Infra-red remote Control System
Unlike conventional remote control systems, the RC-70 poses no problems of distance or bothersome cords. Because it uses infra-red rays, it allows you to control the deck from across the room and is thus great for dubbing and air checking.
Dust Cover
To protect your tape and heads from harmful dust, this smoked dust cover accessory is available. Even with it attached total operation of the deck is possible.
Specifications
Track System:  4-track, 2-channel stereo/monaural system
Reel Capacity: up to 10-1/2: reel
Tape Speed:  19 cm/s ±0,8% (7-1/2"); 9,5 cm/s ±1,0% (3-3/4")
Wow and Flutter: 
Less than 0,03% WRMS (0,08% DIN 45 500) at 19 cm/s
Less than 0,04% WRMS (0,10% DIN 45 500) at 9,5 cm/s
Frequency Response:
30 to 27,000 Hz ±3 dB at 19 cm/s ( using WR tape)
30 to 21,000 Hz ±3 dB at 9,5 cm/s (using WR tape)
30 to 25,000 Hz ±3 dB at 19 cm/s ( using LN tape)
30 to 19,000 Hz ±3 dB at 9,5 cm/s (using LN tape)
Distortion:  less than 0,5% at 1,000 Hz, 0 VU
Signal-to-Noise Ratio:  better than 62 dB DIN 45 500 at 19 cm/s
Erase Ratio:  better than 70 dB at 1,000 Hz
Cross Talk:   better than 40 dB at 1,000 Hz
Channel Separation:  better than 55 dB at 1,000 Hz
Bias Frequency:  100 kHz
Heads:
Two  GX recording heads,
Two  playback heads,
Two  erase head
Motors:
One AC servo motor for capstan drive
Two AC eddy current motors for reel drive
Real Time Counter: up to 99 min, 59 sec. Less than ±15 %
FF & RWD Time:  120 sec. Using 550 m (1,800 ft) Tape
Output Jacks level/Impedance:
Line :  0,775 V (0 VU) Required load impedance more than 20 k Ω
Phone :  100 mV/8 Ω
Input Jacks Sensitivity/Impedance:
Microphone :  0,25 mV Required microphone impedance 600 Ω
Line :  70 mV / 100 k Ω
DIN Jack Input :  2,0 mV/10 k Ω
DIN Jack Output :  0,3V 
Power Requirement:  110 - 120 V, 220 - 240 V, 50/60 Hz
Dimensions (W x H x D):  440 x 483 x 256 mm (17,4 " x 19" x10,1")
Weight:  21 kg (46,4 lbs)

Akai GX-620 reel-to-reel

Stereo Tape Deck. Extended Recording/Playback Capability.
Have it either way, in mono for voices, or stereo for enjoying music at its best. Large 10-1/2" reel capacity permits maximum 12 hours recording/playback in mono  or 6 hours in stereo.

High-performance with GX Head
Akai's  GX head which symbolizes the company's lead in the industry, makes its appearance once again, in the GX-620. GX stands for glass and crystal and the head, in fact, is made of special low-noise crystal ferrite set in super hard glass. This durability, besides affording longer head life, also yields a better dynamic range and improved Signal-to-Noise ratio. Three separate heads - erase, reord and playback - enable off-the-tape monitoring. The contourless GX playback head reduces fluctuations in the playback level in the low frequency range and being focsed-field, the high-frequency characteristics are also improved.
Three-Motor, Direct Capstan Drive System
The GX-620 employs Akai's new C.P.G AC servo motor for the capstan drive. A Sample- and-Hold circuit is incorporated in the servo circuit which improves the response characteristics of the servo to maintain the speed accuracy and reduce vibrations emanting from the motor. A major result is that wow and flutter are reduced to a low 0,08% (DIN) 0,04% (WRMS).

Remote Control System
Operating the GX-620 becomes even easier if you use the RC-18 Remote Control Unit (with Cable) or RC-70 unit. Instead of a long cable which is easy to trip over, the RC-70 sends an invisible stream of infra-red rays to the deck to effect mode change. Connect the RC-18 to a timer and you can make unattended recording while you are out or set the timer for timed playback.
Specifications
Track System:  4-track, 2-channel stereo/monaural system
Reel Capacity: up to 10-1/2: reel
Tape Speed:  19 cm/s ±0,8% (7-1/2"); 9,5 cm/s ±1,0% (3-3/4")
Wow and Flutter: 
Less than 0,03% WRMS (0,08% DIN 45 500) at 19 cm/s
Less than 0,04% WRMS (0,10% DIN 45 500) at 9,5 cm/s
Frequency Response:
30 to 26,000 Hz ±3db at 19 cm/s (WR tape)
30 to 19,000 Hz ±3 dB at 9,5 cm/s (WR tape)
Distortion:  less than 0,5% at 1,000 Hz, 0 VU
Signal-to-Noise Ratio:  better than 62 dB DIN 45 500 at 19 cm/s
Erase Ratio:  better than 70 dB at 1,000 Hz
Cross Talk:   better than 40 dB at 1,000 Hz
Channel Separation:  better than 55 dB at 1,000 Hz
Bias Frequency:  100 kHz
Heads:
One GX recording head,
One playback head,
One erase head
Motors:
One AC servo motor for capstan drive
Two AC eddy current motors for reel drive
FF & RWD Time:  120 sec. Using 550 m (1,800 ft) Tape
Output Jacks level/Impedance:
Line :  0,775 V (0 VU) Required load impedance more than 20 k Ω
Phone :  100 mV/8 Ω
Input Jacks Sensitivity/Impedance:
Microphone :  0,25 mV Required microphone impedance 600 Ω
Line :  70 mV / 100 k Ω
DIN Jack Input :  2,0 mV/10 k Ω
DIN Jack Output :  0,3V 
Power Requirement:  110 - 120 V, 220 - 240 V, 50/60 Hz
Dimensions (W x H x D):  440 x 446 x 241 mm (17,4 " x 17,6" x 9,5")
Weight:  17,6 kg (38,9 lbs)

Electro-Voice Interface C speakers

E-V Interface:C Series II is the fulfillment of our six-year association with optimally vented speakers based on the theories of A. N. Thiele - speaker designs first introduced by Electro-Voice in 1973. the Interface:C offers you a unique combination of high efficiency and high power capacity - the only way to accurately reproduce the 120 = 120 dB peak sound pressure levels found in some types of live music.
The Super Dome tweeter, an E-V exclusive, and the VMR vented midrange driver, the first to apply optimally vented design to mid frequencies, ensure your music is reproduced without the coloration normally found in other high-efficiency drivers. An honest 30 Hz low end totally eliminates the need for expensive subwoofer assemblies.

Specifications
Frequency Response:  25 - 20,000 Hz ±2,5 dB
Recommended Amplifier Power:  350 watts maximum
Sound Pressure:  90 dB at 1W/1m
Crossover Frequencies:  400 Hz and 2,5000 Hz electrical; 42 Hz acoustic
Transducers: 
10" woofer
6-1/2" vented midrange VMR
1-1/2" Super-Dome tweeter with acoustic lens
Impedance:  4 Ω minimum, 6 Ω nominal
Dimensions (W x H x D):  20" x 31-1/2"" x 12-1/2"
Weight:   60 lbs

ADS model L630 speakers


This ADS tree-way speaker system, model L630, features a very high quality dome midrange that provides unusual clarity and openness in the human voice, according to the company. An acoustic suspension soft-dome 1-inch tweeter  with a single-layer, hightemperature metal voice coil, has a magnetic flux density of 1,65 teslas (16,500 gauss), and an operating frequency range from  4,000 Hz to 25,000 Hz. The acoustic suspension soft-dome mid-range 1-1/2 inch driver with high temperature metal voice coil has a magnetic flux density of 1,5 teslas (15,000 gauss), the same magnetic flux as the tweeter, and an operating frequency range from 650 to 4,000 Hz. The long-excursion woofer is 10 inches in diameter, with a 1-1/2 inch high-temperature voice coil and shallow Stifllite cone. The magnetic flux density is 0,90 Teslas (9,000 gauss0, the magnetic flux is 850,000 nW, he free air resonant frequency is 20 Hz, and the operating frequency range is 20 to 650 Hz. The overall speaker system has a frequency response of 33 to 20,000 Hz (±3 dB) or 22 to 22,000 Hz (±5 dB).

Specifications
Musical peak Power rating:  200 W
Recommended Amplifier Power:  20 W minimum, 200 W maximum
Frequency Response:  33 - 20,000 Hz (±3 dB)
Crossover Frequency:  650 Hz and 4,000 Hz
Efficiency:  91 dB SPL at 1W/1m
Impedance:  6 -8 ohms