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Old 21st May 2010, 02:47 PM   #1
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Default Headunit pre amp problem.

I have rca going from alpine HU to mmats mono amp. Each rca output on hu and input on amp work.

Problem is, with both rca connected it will play at the same loudness with just 1 rca connected.

If you lost me , rca should put out 2v to amp, then im getting 1v from 1 rca out and 1v from both rca outputs.
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Old 21st May 2010, 08:37 PM   #2
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The input may not add the signals, it may simply mix them. If both RCAs produce audio no matter which RCA jack on the amp is used, I don't think there is a problem.
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Old 21st May 2010, 11:35 PM   #3
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I tested different model mmats amp and it doubled output with the second rca input connected. Ill try to test it with a different audio source.
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Old 22nd May 2010, 09:50 PM   #4
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The head unit has rca rear/front. I tried connecting sub amp to the front rca output, had major difference 2-3 times louder. Could it be rear rca output is damaged or something?
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Old 24th May 2010, 12:55 AM   #5
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It may have an open shield (but that should have produced noise when the engine was running). Did you check the shield ground for continuity to the case of the head unit?
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Old 24th May 2010, 06:36 PM   #6
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Yes, i did check that, it was ok.
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Old 25th May 2010, 12:54 AM   #7
ppia600 is offline ppia600  United States
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The mono amp will have the same output with both rcas or 1, the input signal doesn't double. On the full range multi channel amps its different. Also be sure the rca output from the deck that you're using isn't high passed.
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