Bose FreeSpace IZA 2120-HZ Service Manual page 113
Integrated zone amplifier / zone amplifier
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Also See for FreeSpace IZA 2120-HZ:
- Installation and operating manual (48 pages) ,
- Installation and operation manual (48 pages)
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TEST PROCEDURES
1.10 Verify that the output level is 120W from both channels and that the THD+N is <0.3%.
2. Frequency Response and Output Noise Tests
2.1 Set the front panel Input A / Input B switch to Input A. Apply a -30dBV, 1kHZ sine wave to the
input A RCA jacks. Adjust the Input A gain rear panel control to allow a 1W output level.
Reference the dB meter to this output level.
2.2 Change the input frequency to 55Hz. Verify that the output level is -3dBr +/- 1.
2.3 Change the input frequency to 18kHz. Verify that the output level is -2dBr +/- 1.
2.4 Turn off the signal generator output. Measure the noise level with a 20kHZ filter and
A-weighting. Verify that it is < -51dBV.
2.5 Repeat steps 2.1 to 2.4 for Input B.
2.6 Set the front panel Input A / Input B switch to Input A. Apply a -30dBV, 1kHZ sine wave to the
input A Euro block jacks. Adjust the Input A gain rear panel control to allow a 1W output level.
Reference the dB meter to this output level.
2.7 Change the input frequency to 55Hz. Verify that the output level is -3dBr +/- 1.
2.8 Change the input frequency to 18kHz. Verify that the output level is -2dBr +/- 1.
2.9 Turn off the signal generator output. Measure the noise level with a 20kHZ filter and
A-weighting. Verify that it is < -51dBV.
2.10 Repeat steps 2.6 to 2.9 for Input B.
2.11 Apply a -30dBV, 1kHZ sine wave to the Page Input jack. Adjust the Page Input gain rear
panel control to allow a 1W output level. Reference the dB meter to this output level.
2.12 Change the input frequency to 55Hz. Verify that the output level is -5dBr +/- 1.
2.13 Change the input frequency to 18kHz. Verify that the output level is -3.5dBr +/- 1.
2.14 Turn off the signal generator output. Measure the noise level with a 20kHZ filter and
A-weighting. Verify that it is < -48dBV.
2.15 Apply a -30dBV, 1kHZ sine wave to the Aux Input jack located on the front panel.
Reference the dB meter to this output level.
2.16 Change the input frequency to 55Hz. Verify that the output level is -3dBr +/- 1.
2.17 Change the input frequency to 18kHz. Verify that the output level is -2dBr +/- 1.
2.18 Turn off the signal generator output. Measure the noise level with a 20kHZ filter and
A-weighting. Verify that it is < -51dBV.
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