so the amplifier is actually amplyfing the pop so its all up to what the input gain of your car amp is set to.Go to the "FAQ" section of this BBS and look for a thread about "common installation problems" or something like that. There is a section on how to properly tune your car amplifiers' input gains.
Right now, when you play the Empeg in your car, what it the absolute loudest you would ever turn up the Empeg's volume under normal circumstances? If it's anything less than 0db, then you need to go tune your amp's gain properly.
After you've done that, if you still get a pop, then we need to look at other possible problems.
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Tony Fabris