front right speakers very quiet?

Alright, I got the head unit out finally without buying those stupid keys and without damage, thankfully.  I was able to take some trim off and depress the tabs that hold it into the tray.  Anyway, I reset the wires back to how they should be, and then noted which speakers/jacks are working.  I then swapped those jacks to the non working speakers both on the head unit and amp.  The non working speakers then worked perfect on the RCA ports that shouldn't have worked if the head unit was faulty.  I suppose that narrows it down to the RCA cables!  Thank you all very much for your help!  I really appreciate everyone who uses this forum and adds useful information to it, this has been a lifesaver!

bigbangs wrote: The polarity is reversed. Check to make sure you have the positive going to the positive of the speaker and the negative going to the negative

Ummm... Yeah, NO! That's NOT the issue. I just read this entire thread, but that was not the issue, ever. Reversing the leads on a speaker WILL NOT cause what was described.It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."