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Thump THA-1000 compatability with GM stereo

Dear Guru,
We are trying to connect a Thump THA-1000 audio amplifier in between the rear speakers and the stereo output on my sons 2000 chevy blazer. When we just touch the center conductor of the RCA plug to the jack we get audio but when we press it in further and the outside of the plug touches the outside of the jack, we loose all audio, even the audio going to the front speakers which we haven't touched.
Do you think we have an impedance problem or could it be something else?
Are Thump amplifiers still manufactured? If so, do you know of a website for the manufacturers?
Thanks,
Rick

Posted by on

  • rmarkiewicz Oct 04, 2008

    Ended up purchasing a $20 Ground Loop Isolator from the local electronics store and placed that between the car stereo output and the amplifier input and that solved the problem.



    Thank you very much for sharing your wisdom!

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  • Master
  • 631 Answers

If you're using the speaker output of the head unit, you need to use either the high level input (if the amp has one) or use a Line Output Converter (LOC). The LOC is generally a better option.

I don't know if they are still in business.

Let me know if you have any other questions.


Posted on Sep 29, 2008

  • Perry Babin Oct 04, 2008

    The GLI is doing basically the same thing as the LOC would have done. They both have isolation transformers. The main difference is that the LOC reduces the output signal level from speaker level to preamp level.

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