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 GXC-570D

Experience the utmost in operating ease and capability with this "top of the line" cassette deck.
This prestige tape deck is designed for the ultimate in convenience and recording and playback quality. Incorporates the world's most advanced engineering techniques, mechanisms, and parts including Akai's GX Head, 3 Motor double capstan drive system.
 GX 3 Head, 3 Motor, Double Capstan Drive System.
The GXC-570D is Akai's top front loading type cassette tape deck and, naturally employs Akai's renown wear-free GX recording and playback heads. Further, a new head arrangement assures perfect tracking so that clumsy azimuth alignment mechanism, beacons, etc. are completely unnecessary.
With this unique 3 head system, the recording and playback heads are mounted in a single head holder. This arrangement provides perfect parallelism of recording and playback head gaps and, because of the proximity of the heads, there is no phase deviation between recording and playback head tracks. Azimuth loss is also eliminated so that azimuth alignment, etc. is unnecessary. This new head positioning plus the professional characteristics of the GX heads themselves brings out the full capability of the tape. Also head-to-tap conect is improved and ideal head shielding reduces feed through of magnetic flux.

A new C.P.G. type AC Servo Motor and two completely new DC "slotless" rotor core motors constitute the superior drive system of this model. The AC Servo capstan drive motor is a C.P.G. (Center Pole Frequency Generated) motor with which a center magnetic pole is established for equal radiation. Merits of this motor include greater inertia and increased output for an extremely quiet motor with perfectly accurate motor revolutions. For reel drive, the GXC-570D employs two of Akai's brand new "slotless" DC drive motors. Because the core of this motor is cylindrical (has no concave or convex parts), there is no variation between the magnetic poles of the magnetic field. Thus, there is no torque unevenness. These unique features result in smooth motor rotation for the elimination of motor rotating noise and decreased woa and flutter.
Closed loop double capstan drive.
One each capstan and pinch roller positioned in parallel on either side of the head block provides perfectly stable tape tension and tape speed. This system shuts out the adverse influence from outside the "closed area" between capstans so that there is no tape vibration. This together withthe 3 motor drive system, extra large flywheels, and a specially designed head mounting plate with linear ball bearing mechanism assures complete stability, perfect head-to-tape contact, and reduces wow and flutter to 0,08% WRMS. So drop-out at recording time is also minimized.

Use low Noise, Chromium Dioxide, or ferri-Chrome Tape.
A 3-way Tape Selector Switch sets the machine to ideal bias and equalization according tothe tape being used. The ability to use quality tape compements the superior mechanism of this machine for the optimum in recording and playback quality.

Repeat playback plus memory Rewind.
When the repeat Button is depressed, at the end of playback or recording mode, the tape rewinds and the machine is automatically set to continuous playback mode. The Memory Rewind Button can be used together with the Index Counter and set to effect stop mode from rewind at any place on the tape. Memory Rewind can also be used together withthe Repeat Button for automatically setting the machine to continuous playback mode from memory rewind position.

Fast Forward and Rewind Speed Control.
Adjust Fast forward and Rewind time according to tape thickness. Prevents thin tape from being broken at high speed.

Pitch Control Playback
Modify playback musical tone as desired with Pitch Control adjustment. Musical interval can be changed by up to plus/minus 1 semi-tone (tape speed plus/minus 5%). Also convenient for precise adjustment of tape speed when playing back tapes recorded on another machine.

Double process Dolby And A-B Monitoring.
This machine incorporates the Double Dolby process system wherein low level signala are raised prior to recording and lowered proportionately at playback time. With this process, extraneous noise is eliminated, also eliminating tape hiss. The GXC-570D's 3 head system and Tape Monitor Switch facilitates A-B monitoring, and the Double Dolby process extends this feature to Dolby recording as well. Further, because there is no space between the recording and playback heads, ther is no time lag between recorded and played back signals during monitoring. Thus, truly professional results are attained.

Other Important Features:
Precise Recording Calibration
Akai's  A.D.R. (Automatic Distortion Reduction) System
Meter Selector Sets Meters for VU Meter or Peak Meter Indicator
Sound Mixing form Separate Sources
Smoothe Logic Circuit Operating Controls Feature Direct Function Change
Limiter Switch Cuts Distortion for Clear Recording at Close Range
Front Loading Convenience
MPX Filter Switch
Automatic Tape Setting Prevents Tape Slack and Assures Stable Tape Start
Double Action Oil Damped Cassette Eject
Instantaneous Full Release Automatic Stop
Automatic Door Opener

Pause Control and Output Level Control

Track System:  4-track, 2-channel stereo system
Tape:  Compact Cassette Type
Tape Speed:  1-7/8 ips (pitch control playback ±5%)
Wow and Flutter:  less than 0,06% WRMS (less than 0,17% DIN 45500)
Frequency Response: 
30 Hz to 15 kHz (±3 dB) :  using low noise tape
30 Hz to 16 kHz (±3 dB) :  using CrO₂ tape
30 Hz to 19 kHz (±3 dB) :  using Fe-Cr tape
Distortion:  less than 1% (1,000 Hz "0" VU) using low noise tape
Signal-to-Noise Ratio:  better than 52 dB
Erase Ratio:  better than 70 dB
Bias Frequency:  100 kHz
Heads:  GX recording head; GX playback  head; GX erase head
One  - AC Servo outer-rotor motor for capstan drive,
Two  - DC motors for reel drive
Fast Forward/Rewind Time:  60 to 80 seconds (variable) using a C-60 Cassette tape
Output Jacks: 
Line :  0,775 V ("0" VU)/ more than 20 k Ω
Phone :  50 mV/ 8 Ω
Input Jacks:
Microphone :  0,3 mV/ 600 Ω
Line :  70 mV/ 100 k Ω
Semiconductors:  110 Transistors; 159 Diodes; 12 FETs; 9 ICs
Power requirement:  110 V to 240 V, 50/60 Hz (switchable)
Dimensions (W x H x D):  440 x 255 x 255 mm )17,3" x 10,0" x 8,9")
Weight:  13,5 kg (28,5 lbs)
Optional  Accessories:  RC-17 or RC-18 Remote Control

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