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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





AIWA AD-A70 (1986)

Two of the most versatile auto reverse decks on the market still wouldn't give you the multifunction operation possibilities available from just one of AIWA's new Auto Sorting double cassette decks. Totally in class by itself, the exciting new AD-A70 pffers quic reverse recording and playback in BOTH decks to allow a wide variety of automatic, microprocessor controlled operations like normal or double speed dubbing from up to 5 cassettes to 1 and random programmable playback from up to 5 cassettes. It's a fact: no other deck available gives you this much convenience and versatility.

What's Auto Sorting?

The answer can be found in Deck I. Inside there's an entirely new system that holds up to 5 cassettes in a special cassettee block. Following the commands input with the front-panel controls, the mechanism actually "sorts" the tapes for random programmed playback and sequential timed recording.

Features

Quick Reverse Recording and Playback

15 Selection Random Programmed Playback

Sequential Playback of 5 Tapes

Automatic Programmed Synchro-Dubbing; Normal or High-Speed

Continous Timed Recording of up to 5 Cassettes (Deck I)

Plus:

AIWA's flat keyboard operation panel with feather-touch full IC logic controls.

Dolby B and C noise reduction system

Electronic Tape counter

Blank skip

Auto/manual Rec-mute

Auto tape selector (Metal/CrO₂/Normal)

Music Sensor (Deck II)

Specifications

Track: 4-track, 2-channel

Tape Speed: 4,8 cm/sec. (1-7/8 lps)

Frequency Response (-20 VU):

Normal: 20 - 14,000 Hz; 30 - 13,000 Hz

CrO₂: 20 - 15,000 Hz; 30 - 14,000 Hz

Metal: 20 - 16,000 Hz; 30 - 15,000 Hz

S/N Ratio: 78 dB (Dolby C, Metal)

Wow and Flutter: 0,06%

Forward and Rewind Time: 90 sec

Head: REC/PB: DX Head x 2; Erase: Double-gap Ferrite Head x 2

Motors: DC servo motor x 2 DC motor for Auto Sorting mechanism x 2

Input Sensitivity/Impedance: 50 mV/47kΩ

Output Level Impedance:

Line Out: 0,38 V/47 kΩ

Headphone: 0,5 mW/8Ω

Power Source: AC 120/220/240 V, 50/60 Hz

Dimensions (W x H x D): 330 x 107 x 348 mm (13" x 4¼" x 13⅝")

Weight: 6,0 kg (13,2 lbs)

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