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4. AMPLIFIER Section
i. AMPLIFIER Measurement Condition
(a) Power Output : Measure without pre-heating
(b) Source Impedance : Normally 600
(c) S/N : Measure the noise level without low frequency ( 80Hz) vibration
(d) Frequency Response : Measure at -10dBs output (1kHz) by adjusting oscillator output
(e) Difference of L/R ch : The output level difference between L ch and R ch at ± 3dB output
(f) Other : In case of no comment, set volume maximum and 4 load
ii. AMPLIFIER Specifications
Measurement Specifications Measurement Condition/Method/Remarks Measurement
Description Test Input Input Signal Output Vol. Method/Remarks
Point Selector Freq. Level Level
Power Output 15±3W SP out Line 1kHz Adjust Adjust MAX Both channel drive/
front THD 2% 4 load
Distortion Less than 2% SP out Line 1kHz Adjust 12W MAX Both channel drive/
4
load read best
value when indicator
of distortion meter is
changing
Line Input 200±50mV SP out Line 1kHz Adjust Adjust MAX
Sensitivity THD 2%
S/N ≥65dB SP out Line 4.7k
5W MAX
Terminate
Channel more than 30dB SP out Line 1kHz Adjust 5W MAX Measure a ratio of
Separation leak level of L
R,
R
L; Measured
channel input terminal
AUX: 4.7k Terminate
Frequency ±2dB SP out Line 80Hz Adjust +3dBs MAX Measure the level
Response 12.5kHz difference
Loudness +10dB±5dB H:10KHz Line 1KHz Adjust --- 30Bar Difference from 1KHz
L:100Hz out
Line Out 80±20mV Line out Line 1KHz Adjust Adjust MAX
Level THD 2%
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