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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





Fostex A-4 tape recorder


Introducing the A-4.
Four tracks on quarter-inch tape (a format our engineers pioneered) at a price that's as irresistible as we could make it. The A-4 drives 7" reels at either 7½ ips or 15 ips. So you can decide between the ultimate in multitrack economy or push for those extra dB's of sound quality.
Like its 8-track big brother, the A-4 has a transport system built from the ground up specifically for multitrack recording. Three low power consumption D.C. motors are used to eliminate the heat problems typical of A.C. motors. And an FG servo controls the capstan motor to prevent line voltage fluctuations from playing havoc with your sound.
The A-4 is a classic three-head design. Separate heads are used for recording, playback and erasing. We;ve even designed a new specially contoured head that gives you extended frequency response and fewer low frequency head bumps.
Operation is fast and easy, too. Select the tracks you want to record on. Then enter the record mode . The A-4 is set up to record where you want to record and automatically play back the other tracks. It also lets you punch in or out at the touch of a botton with no cliks or pops.
You can buy an optional remote foot-switch that gives you a third hand for punching in and out. Just play along with your song, then tap the footswitch to start recording. You'll be able to concentrate onn your music instead of your machine.
The A-4 brings you the kind of convenience we introduced on the A-8. easy to use digital tape counter with bright LED readout. And the Return To Zero memory function for fast tape checks. There's a ±10% pitch control for special effects, optional Dolby C noise reduction system, easy to use. Edit mode with tape dump capabilities and modular electronics for fast economical servicing.
It all adds up to an easy to use, easy to afford multitrack recorder. That's the A-4.

Specifications
Tape:  1/4 inch tape width, 1 mil base
Format :  4 track, 4 channel
Heads:  4 track record; 4 track reproduce, 4 track erase
Reel Size:  7 inch
Tape Speed:  15 and 7½ ips (38 and 19 cm/s) ±0,5%
Pitch Control:  ±10%
Line Input:  -10 dBV (0,3 V) / impedance 30 k Ω unbalanced
Line Output:  -10 dBV (0,3 V) load impedance 10 k Ω or higher unbalanced
Record Level Calibration Equalization:  0 VU referenced to 250 nWb/m of tape flux NAB
Wow and Flutter: 
±0,06% peak (IEC/ANSI) wtd., at 15 ips
±0,10% peak (IEC/ANSI) wtd., at 7½ ips
Fast Wind Time:  130 seconds typ typ. for 1800 ft of tape
Overall Frequency Response: 
At 15 ips :  40 Hz - 20 kHz ±3 dB
At 7½ ips ;  40 Hz - 18 kHz ±3 dB
Signal-to-Noise Ratio (Sync/Reproduce)
At 15 ips ;  65 dB wtd.
At 7½ ips :  referenced to 1 kHz , 3% T.H.D. level
Total Harmonic Distortion:  less than 1% at 1 kHz 0 VU
Crosstalk (Reproduce):  50 dB (at 1 kHz)
Erasure:  better than 70 dB at 1 kHz
Power Requirements:  120 V AC 60 Hz , 35 W
Dimensions (W x H x D):  360 x 340 x 170 mm (14" x 13-1/2" x 6-3/4")
Weight:  13 kg (29 lbs)



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