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Measure the gain (relative to the input signal) at each amplifier output in turn, at the follow-
ing frequencies:
3.6.1 100Hz gain
3.6.2 15KHz gain
3.7
L,C,R,LS,RS channel noise (A-weighted RMS)
Apply +5V to the mute inputs to un-mute the amplifiers.
Disconnect the 8W load from the output of the L,C,R,LS,RS amplifiers.
Short each channel input to ground.
Measure the A-weighted output noise:
3.7.1 L,C,R,LS,RS channel output noise
3.8
Bass channel signal distortion (loaded)
Apply +5V to the mute inputs to un-mute the bass amplifier.
Connect the 4W load across the output of the bass amplifier.
Apply a 100Hz sine wave to the bass amplifier input.
Measure the TND+N at the 4W load with the following output power:
3.8.1 100mVrms in, 0.5W delivered to 4W
3.8.2 1.35Vrms in, 65W delivered to 4W
Do NOT deliver power to the load for any longer than necessary; the output transistors are
not heat-sunk. Remove the input signal as soon as the measurement is complete.
3.9
L,C,R,LS,RS channel signal distortion (loaded)
Apply +5V to the mute inputs to un-mute the power amplifiers.
Connect an 8W load across the output of the amplifier under test.
Apply a 1KHz sine wave to the amplifier input (J700 pin 10).
Measure the TND+N at each amplifier output in turn with the following output power:
3.9.1 533mVrms in, 0.5W delivered to 8W
3.9.2 4.1Vrms in, 30W delivered to 8W
Repeat for each of the remaining signal channels (C,R,LS,RS). Do NOT connect the 8W
load to more than one output at once. Do NOT deliver power to the load for any longer than
necessary; the power amplifiers are not heat-sunk. Remove the input signal as soon as
the measurement is complete.
Framingham, MA 01701-9168
11.5dB ± 2dB
11.5dB ± 2dB
SIZE
FSCM
CLASS
A
32108
< 300uV
less than 0.4%
less than 0.3%
less than 0.3%
less than 0.3%
DWG NO.
TS
197297
SHEET
REV.
56
00
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