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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 SD-L50 cassette deck


 Stereo Cassette Deck

A front-loading model with all the features of full-sized units, the SD-L50 nonetheless is an incredibly compact 25 cm wide by 10,7 cm high, making it one of the most compact cassette decks currently available.

Circuitry and head design have been reinforced to give superb sound quality from the new high performance metal tapes.  IC logic controls with a stroke of just 0,3 mm contribute to the positive feeling of operation, while the dual motor drive transport holds wow and flutter to below 0,04% (WRMS). The deck can also be set to perform automatic rewind/repeat play of one side of a tape up to 8 times or until halted manually. For accurate record level settings, 2 rows of 12 LEDs display peaks in 3 colors from -20 to -2 dB (green), 0 to +4 dB (yellow) and +6 to +10 dB (red)

By adding the optional MT-50 timer, the unit can be set for unattended recording, and in the timer's Tape Time mode, digital countdown display of the time remaining on the tape facilitates recording operations. The RC-R300 remote control system (another recommended optional) can be utilized for operation of all deck transport functions from up to six meters (20 feet) away.

Features:

Dolby noise reduction system

Smooth oil-damped cassette eject

Rec-sync operation with Aiwa turntable

Front panel mic and headphone inputs

Digital tape counter

 


Specifications

Track Type:  4-track, 2-channel

Tape Speed:  4,8 cm/s ±1,5%

Wow and Flutter

DIN 45500 :  less than 0,1%

WRMS :  less than 0,04%

Automatic Stop System:  Full Auto Stop

Automatic Shut-Off Action Time:  3 ±1 s

Pinch Roller Pressure:  350 ±30 g (3,43 ±0,29N)

Take-up Torque:  50 ±10 g-cm (490 ±98 mN-m)

FF and Rewind Torque:  155 ±65 g-cm (1520 ±637 mN-m)

FF and Rewind Time:  90 s (C-60 cassette)

Playback Output:  0,58 ±0,05V (Line, DIN)

Playback Noise: 

Cr02 Dolby NR Off/On :  less than 2,0/1,5 mV

LH Dolby NR Off/On :  less than 2,5 /1,5 mV

Rec/Pb Distortion: 

Metal :  less than 1,1%

CrO₂ :  less than 2,0 %

LH :  less than 1,2%

Rec/Pb SN Ratio (1 kHz, Unweighted, Dolby NR Off/on) :

Metal :  more than 45/45 dB

CrO₂ :  more than 45/47 dB

LH :  more than 42/43 dB

Channel Separation (1 kHz, 0 VU):  more than 35 dB

Crosstalk (1 kHz, 0 VU):  more than 65 dB

Erasing Ratio (400 Hz, 0 VU, +10 dB ):  more than 60 dB

Bias Frequency:  85 kHz

Frequency Response:

Metal :  25 -17,000 Hz

CrO₂ :  25 - 27,000 Hz

LH :  25 - 15,000 Hz

Motor: 

Capstan :  DC Servo Motor

Reel :  Dc Motor

Inputs Sensitivity/Impedance:

Mic :  0,3mV (max.)/200 Ω  - 10 k Ω  suitable)

Line In :  50 mV (max.)/50 k Ω

DIN :  0,1 mV/2,7 k Ω

Outputs Level/Impedance:

Line Out :  0,41V (0 VU)/50 k Ω

DIN :  0,41 V (0VU)/50 k Ω

Phones Output Impedance:  8 Ω

Semiconductors:  11 ICs; 66-69 Transistors; 39-40 Diodes; 29 LED

Power Requirements:  AC 220 V, 50 Hz or AC 240 V 50 Hz

Power Consumption:  18 W

Dimensions (W x H x D):  250 x 105 x 260 mm

Weight:  4,5 kg

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