Test Procedures; Frequency Response Test Table - Bose 1600VI Service Manual

Figure 11. EQ Card Placement
Test Setup Parameters:
1. In order to test these amplifiers at full
power, you will need at least one 4Ω, 500W
load and one 8Ω, 500W load.
2. Set up the amplifier under test as shown
in the Test Setup Diagram, Figure 12.
3. For the following tests it is recommended
that you apply balanced signals for all input
levels. If you do not have the ability to
provide balanced signal inputs, you may
use a single-ended input signal. Be sure to
connect the negative leg of the wiring to
ground for proper gain levels.
4. You will need input cables with either
XLR, TRS, or the 3-pin connectors (Bose
part number 182769) in order to be able to
apply an input signal to the amplifier. Refer
to section 2.1 of the Theory of Operation for
the wiring scheme.
5. The input levels shall be the actual level
as measured at the input jack, not the
signal generator open circuit level.
6. If you have an amplifier with the Bose
ACM-1 Amplifier Control Module installed,
you will need to replace it with a standard
Input Module in order to be able to test it.

TEST PROCEDURES

®
31
Only if you are connected to a Bose control
network using the required Bose software
will you be able to pass audio through an
amplifier with a Bose ACM-1 Amplifier
Control Module installed. Refer to the
ACM-1 service manual part number
199746 for more information.
Audio Signal
Generator
dB Meter
Amplifier
Inputs
rear panel
Input Module
Figure 12. Amplifier Test Setup Diagram
1. Gain Test
1.1 Apply a 41 mVrms, 1 kHz signal to the
input of the amplifier channel under test.
1.2 Reference a dB meter to the input level.
1.3 Measure the output level for the
channel under test. For the 1600VI ampli-
fier, it should be +27.6 dB ± 0.5 dB for low
sensitivity units, and +33.3 dB ± 0.5 for
high sensitivity units. For the 1800VI
amplifier, it should be +30.3 dB ± 0.5 dB for
low sensitivity units, and +36.0 dB ± 0.5 for
high sensitivity units.
2. Frequency Response Test
2.1 Apply a 16 mVrms, 1 kHz signal to the
amplifier channel under test.
2.2 Reference a dB meter to the output
level. This is the reference level.
2.3 Measure the frequency response. It
should be 0.0 dB ± 0.75 dB from 20 Hz to
20 kHz.
Loads
Outputs