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Re: Question for the stereo gurus (archive)

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Posted by AC on December 09, 2001 at 13:35:47:

In Reply to: Question for the stereo gurus posted by Confused on December 09, 2001 at 10:21:22:

I have an '88 with the non-infrared HU. The system is completely stock right now. I only want to replace the HU with an aftermarket one and still use the existing speakers. The stereo shop I went to said it could not be done because of the factory amp and the fact that the front speakers run at different ohms than the rears, something the factory amp handles. They said if I bypass the amp and try to run the fronts off the HU's amp that I may damage the new HU. I did not have this issue when I replaced the radio in my 320 nor have I had this issue with other cars, but no factory amp was involved either. Does this make sense or am I being fed a load of crap? Is there a way to use the existing speakers with a new HU without damaging anything? I am installing a Nakamichi CD-45z if that makes any difference.

Thanks for the assistance.

There should be no problem with using the existing speakers as far a damaging the amp. Check with Nak.factory. However there may be difference in sound level since all four speakers are not the same. This is not related to impedance but simple efficiency of the speakers themselves. If you can adj the level individually there should be no problem (P=I square x R)A transistorize amp will match the impedance it is presented. Any amp would prefer a 8 ohm load rather than a 4 ohm since 4 ohm is closer to a short circuit than 8 ohm.

If you chose you can run the front with your Nak. and the rear with the factory amp. The Nak. has four pre outs. If the factory amp has four inputs to four separate amp there should be no problem with replacing the Head unit with the Nak.

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