I couldn't find this or get this answered in audio, but it's for my 3rd gen - the back speakers(bose), when not turned up too loud, but full bass boost, are froggy, like the singer is gurgling(from vibration). But I dont go enough to upgrade entire system. Could I put normal 6x9's in the back hooked up to the amp, and will it sound better - untill I can save up the rest for front speakers and a HU?
The sales people aren't very knowledgable at all on this one(the search here did help, but I'm not positive on the dif ohms effect)

 

sure cant...the bose stuff is picky n such...the only way i know 2 go is to replace everything...u simply arent gonna get any treble outa those back speakers, but who cares really...replace the HU and front speakers 1st and go from there...

 

You'd be better off just bypassing the amp altogether if you want to add more speakers. The OEM one's are optimized at 1 ohms, and putting a 4 ohm speaker (industry-standard for aftermarket speakers) is equivalent to letting me choke the life out of you while you give a speech on resistance to a crowd.

 

Actually its perfectly OK to replace the factory bose with aftermarket 4 ohm speakers. There is a pro and a con to doing this. When putting in a 4 ohm speaker in place of a 1 or 2 ohm speaker, the amplifier will put out less power (and it will actually have less of a load and will extend its life). But b/c the new speaker will be much much more efficient than the bose, this will help compensate the loss of amplifier output. I currently have 6 1/2 focal speakers in the rear deck and they sound awesome, the highs are bright and clean and the bass is very smooth. If you do not replace all four speakers it will be a bit difficult to balance the front to the rear (but its not really a big deal), b/c the fronts will be getting proportionally more power than the rear, but the efficency of the rear will also compensate.