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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-325D tape deck

Dual Monitoring Cassette Stereo Tape Deck

With taped music, as in five card stud, you'll always get the results you want when you play with a deck that always delivers what you want. Take this deck, one of the new cassette decks from Akai.

The GXC-325D. It comes stacked with features to make your music sound clearer, and richer. It has a three head function, with separate recording and playback heads for wider frequency response. It comes with a closed loop double capstan, which maintains proper back tension, and perfect tapw and head contact.

 

The recording and playback heads of this new 3-head system are Akai's revolutionary GX Heads and are joined for perfect parallelism of recording and playback head gaps. This combined with the Closet Loop Double Capstan system and AC Servo Motor of this model clearly makes it the leader in the field of cassette recording.

Two each capstans and pinch rollers are used, one each of which is positioned in parallel at either side of the head block for stable tape speed and tape tension. This shuts out the adverse influence from outside the "closed" area between capstans so that there is no tape vibration and head-to-tape contact is perfect. Some of the other merits of this system include:

Perfect tracking and the elimination of azimuth alignment adjustment mechanisms, beacons, etc.

Better Signal-to-Noise Ratio and a wider dynamic range

Wow and Flutter reduced to 0,55% WRMS and sound drop-out minimized

3-head system facilitates Dual Monitoring and because of head portioning, there is no time lag between recording and playback signals during monitoring

Intermodulation suppressed for clearer playback

C.P.G. [Center Pole Frequency Generated] system of AC Servo Motor results in greater inertia and increassed output for extremely quiet operation and accurate motor revolutions

Performance not influenced by cassette unevenness

Completely stable operation and incomparably clear recording and playback tone quality

Lasting new machine performance

 


Features:

New 3-Head Cassette System

Individual recording/Playback Glass & X'tal Ferrite Heads

Closed-Loop Double Capstan Drive Mechanism

Amazingly Low 0,055% WRMS Wow and Flutter

Newly Designed C.P.G. AC Servo Motor

Akai's exclusive A.D.R. Plus Double Process Dolby Noise Reduction System

Memory Rewind

Peak Level Indicator

Limiter Circuit Prevents Over-Level Recording

Instantaneous Full Release Automatic Stop

Output Level Control Mic/Line Mixing

Tape Run Indicator

Self-Lock Pause Control

Direct Function Change Control

 


Specifications

Track System:  4-track, 2-channel stereo system

Tape Speed:  1-7/8 ips

Wow and Flutter:  0,055% WRMS

Frequency Response:

Low Noise Tape :  30 Hz to 15,000 Hz (±3 dB)

CrO₂ Tape :  30 Hz to 16,000 Hz (±3 dB)

Fe-Cr Tape :  30 Hz to 19,000 Hz (±3 dB)

Distortion:  less than 1% (1,000 Hz "0" VU)

Signal-to-Noise Ratio:  better than 51 dB (measured via tape with peak recording level of +5 VU. Dolby switch On, Improves up to 10 dB above 5 kHz)

Erase Ratio:  Better than 70 dB

Bias Frequency:  100 kHz

Heads:  three head system includes One Glass and Crystal Ferrite Rec/Power Bandwidth, combination head, and One Ferrite Erase head

Motors:  AC servo outer rotor motor

Fast Forward and Rewind Time:  75 sec. (C-60 cassette Tape)

Output jacks:

Line :  0,775 V ("0" VU) Required load impedance , more than 20 k

Phone :  30 mV/ 8 k

Input Jacks:

Microphone :  0,3 mV/8 k

Line :  70 mV/100 k

DIN Jack:  0,775 V/2 mV

Semiconductors:  60 Transistors; 51 Diodes: 4 FET's; 1 IC.

Power Requirements:  110 to 120 V , 220 to 240 V, 50/60 Hz

Power Consumption:  30 W

Dimensions (W x H x D):  442 x 142 x 301 mm (17,4" x 5,6" x 11,9")

Weight:  8,6 kg (18,9 lbs)