Bose PowerShare PS404A User Manual

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9. AmpLink Output Level and Frequency Response Test
9.1 Connect a 32 ohm load to the amplier output channels. Set the rear panel 70V/100V dip switch to
100V. All other dip switches should be set to the LEFT. On the UUT rear panel, set the Input Select rotary
switch to position 3, AmpLink inputs 1-4.
9.2 Connect a shielded RJ45 ethernet cable from the AmpLink connector on the ESP-880 to the AmpLink
input on the amplier (UUT).
9.3 Using the ControlSpace ESP-880 (or similar) as an AmpLink signal source, set the output of the
ESP-880 to supply a 1kHz, 0dB signal.
9.4 Verify that the output level from the PS404A or PS604A amplier is 25.5dBV + 1dBV.
9.5 Reference a dB meter to the output level.
9.6 Change the input frequency to 20Hz. Verify that the output level is 0dBr +1dBr.
9.7 Change the input frequency to 20kHz. Verify that the output is level 0dBr +1dBr.
10. AmpLink THD+N Test
10.1 Set the ESP-880 output level to get a 100W per channel output at 1kHz from the amplier.
10.2 Measure the THD+N level at the UUT amplier outputs. Verify that it is < 0.1%.
11. Output Noise Test
11.1 Connect a 4 ohm load to the amplier output channels. Set the rear panel output 1-4 dip switches
to Low-Z (right). All other dip switches should be set to the LEFT. On the UUT rear panel, set the Input
Select rotary switch to position 3, AmpLink inputs 1-4.
11.2 Using an Audio Precision AUX-0025 digital lter (or equivalent) with a 20kHz lter and A-weighting,
measure the output noise level at the amplier’s output jacks. Verify that it is < 62dBV.
12. Output Gain Control Range Test
12.1 Set the Output 1 - 4 DIP switches to Hi-Z mode (left). Set the GLOBAL OUT DIP switch to 100V
(right). Set the SENSITIVITY DIP switch to 4 dBu (left).
12.2 Connect 32 Ohm, 250W loads to the channel 1 - 4 outputs.
12.3 Apply a 1 kHz, -19.3 dBV input to the channel 1 - 4 input jacks.
12.4 Measure the output level at the channel 1 - 4 output jacks. It should be +19 dBV +/- 1 dBV.
12.5 Decrease the signal input level to attain a 0 dBV output from channels 1 - 4.
12.6 With the above signal applied, rotate the channel 1 - 4 OUTPUT ATTEN controls from zero to -
innity. Verify that the output level decreases from 0 dBV to innity.
TEST PROCEDURE

Bose PowerShare PS404A Specifications

General

Purpose	-
On/off switch	Yes
Product color	Black
Connectivity technology	Wired
Audio output channels	4.0 channels
Peak power per channel	400 W
Signal-to-Noise Ratio (SNR)	100 dB
Total Harmonic Distortion (THD)	0.04 %
Ethernet LAN (RJ-45) ports	1
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (standby)	14 W

Weight and Dimensions

Depth	414 mm
Width	483 mm
Height	44 mm
Weight	6400 g