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Old 14th February 2013, 04:26 PM   #1
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Question LM3875 Frequency Response

Hello, all!
I have been setting up a test bench for measuring audio equipment performance. I have been using my AudioSector LM3875 Classic Kit (built in 2010) as a guinea pig. It's a stock build, with a single rectifier board. It works perfectly, and sounds very good. However, I do have a question...

Attached is the Frequency Response chart, generated by PC software for the LM3875. As you can see, it's flat to about 1K and then rises steadily. Multiple test were ran, all with the same results. Bypassing the amp (loopback) shows a flat response as expected. My question is, does this graph look accurate? Or, is there some sort of problem in my test bench? I haven't had a chance to test a different amp yet. Hopefully I can do that this weekend, and post the results here.

Click the image to open in full size.

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Old 14th February 2013, 04:54 PM   #2
JMFahey is offline JMFahey  Argentina
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Sorry but your graph is unreadable small.
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Old 14th February 2013, 04:58 PM   #3
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Ah, sorry. The gallery has 3 links for posting images, and I always choose the wrong one.


I also just noticed a rookie mistake. The graph is in dbfs, which isn't terribly useful.

Last edited by acceler8; 14th February 2013 at 05:02 PM.
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