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





Boston A150 loudspeakers

The new model A150 offers performance similar to our larger, more expensive A200 in a more compact, less expensive enclosure.
The three-way A150 employs a 10-inch acoustic suspension woofer, a 4-1/2" midrange with ferrofluid, and a 1-inch soft dome tweeter with ferrofluid in a 30-1/2" (high) x 16-1/2" (wide) x 8" (deep) cabinet finished in furniture-grade oak veneer.
A 1-1/2-inch black pedestal base is supplied for floor placement.
The tall, slim cabinet together with careful driver placement minimize out of phase reflections from nearby room surfaces (the flor and the wall behind the speaker) for exceptionally smooth response and precise stereo imaging.


Specifications:
Frequency Response:  36 Hz - 25,000 Hz ±3 dB
Crossover Frequencies:  550 Hz and 3000 Hz
Impedance:  8 Ω nominal
Sensitivity:  90 dB at 1 meter with 1 watt input
Dimensions (W x W x D):  32" x 16-1/2" x 8"

NAD 5325 compact disc player


Specifications
Decoding: 16-bit linear two channels
Frequency Response (Nominal):  8 Hz - 20,000 Hz +0,2 dB -2,0 dB
Deemphasis Error:  +0,5 dB -1,0 dB
Out[ut Level at 0 dB:  2 Volts ±0,7 dB
Total Harmonic Distortion (W/20 kHz L.P.F. at 1 kHz, 0 dB):  0,04% (Nominal); 0,07% (Limit)
Signal-to-Noise Ratio (2W/20 kHz L.P.F)):  96 dB (Nominal); 90 dB (Limit)
Channel Separation:  80 dB (Nominal); 70 dB (Limit)
Channel Balance (at 1 kHz, 0 dB):  0,1 dB (Nominal); 1,0 dB (Limit)
Wow and Flutter:  Unmeasurable (Quartz crystal accuracy)
Remote Control :  Yes
Power Requirements: 110 V, 220 V, 240 V AC 50/60 Hz
Power Consumption:   14 W (0,11A )
Dimensions (W x H x D):  420 x  87 x 231 mm (16,54" x 3,43" x 9,09")
Weight:  3 kg (6,6 lb)

NAD 6325 cassette deck


NAD Cassette Deck model 6325 features
Dolby B and C
CAR Circuit Optimizes Recording for Mobile Environment
Play Trim
Full Logic Transport

Specifications
Speed Accuracy:  +1%
Wow and Flutter: 
less than 0,06% (JIS wtd RMS)
less than 0,1% (DIN wtd. Peak)
Frequency Response:  35 Hz - 16 kHz +3 dB (Dolby NR Off)
Harmonic Distortion:  varies with recording level typically less than 0,3% at -10 dB
Total Harmonic Distortion at 0 dB:
Normal Tape :  less than 1,0 %
CrO₂, Metal Tape :  less than 1,5%
Signal-to-Noise Ratio (ref.3% T.H.D. at 333 Hz CC1R/ARM weighting):
Dolby off :  56 dB
Dolby B :  66 dB
Dolby C :  76 dB
Channel Separation:  40 dB at 1 kHz (35 dB broadband)
Erasure:  better than 70 dB at 1 kHz
Input Sensitivity /Impedance:  40 mV/10 k Ω
Maximum Input level:  25 V
Output Level at 0 dB:  500 mV
Output Impedance:  1000 Ω
Power Requirement:  120, 220, 240 V AC 50/60 Hz
Power Consumption:  23W at 120 V AC
Dimensions (W x H x D):  420 x 122 x 270 mm (16,5" x 4,8" x 10,6")
Weight (net):  4,4 kg (9 lb 13 oz)

Mitsubishi DT-10 cassette tape deck

Advanced Features and Superior Performance
The DT-10 offers both excellent basic performance and great ease in use combined with the attractive lines of the whole Mitsubishi Audio Component line0up. Ultralow wow and flutter - only 0,06% WRMS; are ensured by the use of a DC servomotor with large (2-7/8") flywheel, a capstan circular to within a 0,3 µ tolerance, and a high precision drive assembly.
Special circuitry and selected components help to realize the full advantages of Dolby noise reduction. Mitsubishi's own ultralow-noise PNP-type epitaxial transistors are used in the first stage of the recording equalizer amplifier.

Residual tape meter
The DT-10 has a special meter to tell you how much time is left before the tape will end. Often useful during playback, it is an invaluable aid to high quality home recording.

Recording Master Volume Control and Mixing Facilities
Like the DT-30 , the DT-10 has separate level controls for Mic and Line inputs, so that both can be mixed, and a master recording level control for professional-type fade-in and fade-out effects.

Other Features and Functions
Dolby noise-reduction system
Peak-level indicator plus VU meters
Memory rewind function to (000) on the counter.
Timer-controlled recording and playback possible
l-channel Mic input doubles as input for a mono Mic
Output  level control
Two position adjustment of both equalization and bias
Oil-damped gentle cassette-ejection mechanism.

Specifications
Tape Speed:  4,75 cm/sec (1-7/8 ips) ±1%
Wow and Flutter:  0,06% WRMS
Fast Forward/Rewind:  80 sec (C-60 tape)
Signal-to-Noise Ratio (+3 VU, weighted, 400 Hz)
Dolby Out :  56 dB
Dolby In :  64 dB
Erasure Ratio (1 kHz):  70 dB
Crosstalk: 
Between Channels (500 - 6,300 Hz) :  35 dB
Between Tracks (1 kHz) :  65 dB
Total Harmonic Distortion (400 Hz):  1%
Frequency Response:
Normal Tape :  40 - 12,000 Hz ±3 dB
Special Tape :  40 - 15,000 Hz ±3 dB
Sensitivity:
Mic Input :  0,24 mV
Line Input :  80 mV
Bias Frequency:  85 kHz
Dimensions (W x H x D):  425 x 170 x 379 mm (16-3/4" x 6-3/4" x 14-7/8")
Weight:  9,5 kg (21 lbs)