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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





NAD 4225 tuner

 

NAD FM/AM Tuner, features:

Ultra, linear LF Filters

Switchable Blend Circuit

14 Random AM/FM presets

 


Specifications

Input Sensitivity

Mono (-30 dB , T.H.D. +N) :  11,3 dBf (2,0 µV/300 Ω)

Mono (50 dBS/N) :  15 dBf (3,0 µV/300 Ω)

Stereo (50 dBS/N) :  37 dBf (40 µV/300 Ω)

Stereo (60 dBS/N) :  47 dBf (120 µV/300 Ω)

Capture Ratio: (45 and 65 dBf):  less than 2,0 dB

AM Rejection (45 and 65 dBf) :  better than 65 dBf

Selectivty, Alternate Channel :  65 dBf

Image Rejection:  90 dB

RF Intermodulation:  65 dB

IF Rejection:  100 dB

SCA Rejection:  60 dB

Spurious Rejection:  100 dB

Subcarrier Suppression (19 and 38 Hz):  60 dB

Output Impedance:  600 Ω

Total Harmonic Distortion (at 100% mod.)

Mono (1 kHz) :  0,09%

Mono (100 Hz - 6 kHz) :  0,2%

Stereo (1 kHz) :  0,09%

Signal-to-Noise Ratio (65 ddb, IHF Weighted)

Mono :  80 dB

Stereo :  75 dB

Frequency Response:  30 Hz - 15 kHz ±0,5 dB

Stereo Separation:  50 dB (11 kHz)

FM NR off (30 Hz - 15 kHz) :  35 dB

AM Section

Usable Sensitivity:  5 µV

Selectivity:  35 dB

Image Rejection:  30 dB

IF Rejection:  35 dB

Signal-to-Noise Ratio (30% mod. 50 mV input):  45 dB

Total Harmonic Distortion :  0,3%

General

Power Requirements:  100, 120, 220 or 240 V AC, 50/60 Hz

Power Consumption:  10 watts

Dimensions (W x H x D):  420 x 762 x 250 mm (16,5" x 3" x 10")

Weight (net):  3,2 kg (7 lb 1 oz)

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