The adventure continues.

I went to the auto parts store where I had bought my Polk subwoofer and spoke to Mr. Car Audio Expert. His spot diagnosis was just about spot on. He asked if the existing front door speaker that I am piggybacking signal off (in fact, wiring the ribbon tweeter parallel with) had a tweeter itself. It does- it is a Kenwood KFC - M1632A, a current model.His comment was that if it did, adding another tweeter would upset the woofer in that speaker assembly. He described the symptoms well.

On paging thru a very helpful car audio site ( http://www.bcae1.com/) and examining the section on Series-Parallel Basics, it seems that although I wired in parallel to avoid halving the impedence and thus putting the head unit amp at risk, I was wrong about this principle. It looks like the connection I had made was resulting in a total 2 Ohm load. Seems I should wire in series instead. Thus the negative side of the door speaker should be connected to the positive side of the ribbon tweeter, and the negative sisde of the ribbon then sent back to the head unit. Total impedence should then be 8 Ohms as each unit is 4 Ohms.

Is this correct and a safe option for extended use?

Thanks,

J.