Marantz 3600 - Turnover Frequencies; Volume Tracking; Loudness Contour

+15
+10
+5
0dB
- 10
20 Hz 100 Hz
Figure 8. Tone Control/Turnover Network Characteristics
M.
12
TURNOVER FREQUENCIES (Figure 8.)
1.
2
w
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Set generator frequency to 50 Hz. De-
press 250 Hz TURNOVER pushswitch.
Slide BASS Control up to maximum
boost. Output signal level should increase
6 dB + 1 dB. Slide BASS Control down
to maximum cut. Output signal level
should decrease 6 dB + 1 dB. Center
BASS Control. Depress and release 250
Hz TURNOVER pushswitch.
. Set generator frequency to 17 kHz. De-
press 4 kHz TURNOVER pushswitch.
. Slide TREBLE Control up to maximum
boost. Output signal levél should increase
6 dB + 1 dB. Slide TREBLE Control
down to maximum cut. Output signal
level should decrease 6 dB + 1 dB. Center
TREBLE Control. Depress and release 4
kHz TURNOVER pushswitch.
5. Set TONE control to OUT.
VOLUME TRACKING
1 . Connect generator to AUX INPUT. De-
press AUX Selector pushswitch. Rotate
VOLUME Control CW to maximum. Mon-
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1 KHz
10 KHz 20 KHz
itor signal at PREAMP OUTPUT with
AC VTVM.
. Set generator frequency to 1 kHz. Set
generator output for a O dB output
level at VT VM.
. Reduce volume in 5dB increments while
monitoring both outputs of the preamp.
Right and left channel output levels should
be within + 3 dB of each other down to
- 40 dB. Output levels should be within
+ 4 dB of each other from — 40 dB to
~50 dB.
P. LOUDNESS CONTOUR
1.
Connect generator to AUX INPUT. De-
press AUX Selector pushswitch. Monitor
output at PREAMP OUTPUT with AC
VTVM.
. Set generator frequency to 100 Hz, 10 dB
at PREAMP OUTPUT.
. Reduce generator output to —30 dB at
the VT VM.
. Depress LOUDNESS pushswitch. Signal
level should increase 6 dB (+ 1 dB).
. Repeat test with generator frequency set
to 10 kHz. Output signal level should
increase 4.5:dB (+ 1.5dB).