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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-65D cassette deck

From Akai new sound in cassettes

Akai gives you the most perfect cassette recording in the world today.

That's a mighty big claim. But we can prove it. Our GXC-65D Stereo Cassette  Recorder is innovatively engineered with ADRS. This exclusive system eliminates almost all high frequency distortion above 8,000 Hz.

But we didn't stop there.

We combined ADRS with Dolby, and then added Akai's exclusive GX (Glass and Crystal ferrite) head.

The clear, undistorted signal is a pleasure to behold. And a greater pleasure to hear. What's more, the GXC-65 D is equipped with Akai's Invert-O-Matic - automatically reverses the cassette inside the recorder for continuous repeat/reverse. And the Invert-O-Matic mechanism is unconditionally guaranteed for two years - parts and labor.

So you can stop sitting around waiting for perfect cassette recording. Listen to the GXC-65D - your ears will make up your mind for you.

 


Illustrated below are the actual output curves of 13,000 Hz signal from a Dolby equipped cassette deck without ADRS, and a comparable curve from the new Akai GXC-65D.

 


Specifications

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

Tape Speed:  1-78 ips ±2%

Wow and Flutter:  less than 0,12% RMS

Frequency Response:

Chrom Tape :  30 to 18,000 Hz

LN Tape :  30 to 16,000 Hz

Signal-to-Noise Ratio:  better than 58 dB with Dolby

Distortion:  less than 2% at 1,000 Hz "0" VU recording

Crosstalk:  better than 25 dB

Erase Ratio:  better than 70 dB

Bias Frequency:  61 ±3 kHz

Bias Leak:  less than -50 VU

Outputs:

Line :  0 ±1,5 dB (0,775 V) using a 333 Hz pre-recorded tape

DIN :  0,4 V

Phone :  30 mV at 8 Ω

Speaker :  6 W each channel at 8 Ω

Inputs:

Mic :  more than 0,4 mV / 4,7 k Ω

Line :  more than 50 mV/ 200 k Ω

DIN :  more than 7 mV (low), 70 mV (high)

Recording Capacity:  1 h stereo recording using C-60 cassette tape

F.Fwd and Rwd Time :  68 sec (C-60)

Heads:

Recording/Playback:   P4-330, 4-track, 2-channel GX rec/playback head

Gap /  Impedance :  1,4 - 1,9 microns/1,200 Ω  ±20% at 1 kHz

Erase Head :  E4-150, 1-track, 1-channel erase head

Gap  /Impedance :  0,3 mm / 195 Ω  ±10% at 100 kHz

Motor:  Hysteresis Synchronous Outer-roter motor

Typ :  HM-12CS

Revolutions :  1,500 / 1,800 rpm at 50/60 Hz

Power Supply:  100 to 240 V AC 50/60 Hz

Power Consumption:  50 W (recorder type), 20 W (deck type)

Dimensions (W x H x D):  415 x 180 x 290 mm (16,6" x 7,2" x 11,6")

Weight:  9,2 kg (20,2 lbs)


 

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