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9. Bass Performance Tests
Note: Refer to table 13 for the following
tests.
9.1 Set up the unit under test as listed in
the Test Setup Notes section.
9.2 Apply a 31.5mVrms, 1kHz signal to the
Signal Input jacks at J1.
9.3 Reference a dB meter to the output
level. This is the reference level.
9.4 Perform the Bass 20Hz, and 100Hz
tests as listed in Table 13.
10. High Pass Filter Test
Note: This test checks the response of the
150Hz high pass filter.
10.1 Set up the unit under test as listed in
the Test Setup Notes section.
10.2 On the main PCB, place the High
Pass Filter switch (S4) to the HPF IN
position.
10.3 Apply a 31.5mVrms, 1kHz signal to
the Channel 1 Source Input (J1).
10.4 Reference a dB meter to this output
level.
10.5 Apply a 31.5mV, 50Hz signal to the
Channel 1 Source Input.
10.6 Measure the output at Channel 1 (J6).
It should be -22.0dBr ± 3dB (balanced
inputs), or +12.5dBr ± 3dB (unbalanced
inputs).
AMPLUS™ 50 TEST PROCEDURES
11. D.C. Offset Test
11.1 Set up the unit under test as listed in
the Test Setup Notes section.
11.2 With both inputs terminated, and with
no signal applied, measure the D.C.
voltage at the Channel 1, 4Ω Speaker
Output.
11.3 It should be 0mVDC ± 10mVDC.
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