Factory 4chnl JBL amp

[only1me]

I been doing alot of reading and studying up the past few days on stereos,speakers, amps, so on. I still have a couple questions though.

From what I have read and understand when you have an amp say rated at so many watts per channel and you switch to a lower ohm speaker it then produces more power to that speaker correct? Where as if you go to a higher ohm speaker it takes more power to push it,so the amp can't push as many watts to that speaker.

So my second question is the factory 4chnl JBL amp was rated at 15watts rms per channel using 6 ohm speakers ,so if say one kept the factory amp, but switched to 4 ohm speakers, would it produce more power per speaker and at how many watts?

I am debating whether using the pioneer's factory internal amp 45w x 4 and 22w rms, or using the preouts and just using the factory JBL amp and using 4ohm speakers front and rear which I planned on anyways either way.

 

[K-Dawg]

I've done it both ways. Realistically you'll never be able to tell the difference between the two.

 

[only1me]

So if rates at 15w x 4 at 6ohms, then what would it be at 4ohms? I know with any amp when you go down in ohms, the amp can produce more power to the speakers.Like switching from an 8ohm to 4ohm sub, there is a difference in power handling.

 

[baySHO_510]

Try it both ways and see what sounds better. I think you might end up with some distortion and/or bass cutting out at higher volume when you use the factory amp with an aftermarket headunit. I think the factory JBL amp needs a high signal so you might have to feed through your Pioneers speaker outputs. Note that all amps have a limit as to how low of an impendance they can go. Im sure the stock unit wont go too low. Most amps will only go to 2 ohms & some of the high end monoblock class D amps are stable down to .5 ohms.

I ended up throwing out the whole factory JBL thing and went with a new system. A Earthquake 60x4 rms amp for 2 Infinity Kappa Series 6 1/2" Fronts & Phoenix Gold 6x9" Rear... And a Alpine 400x1 rms@2ohms amp for 2 10" JL Audio subs. I did keep the stock head unit though. I just ordered about $2800 worth of MTX equipment for my 2 SHOs & a Nissan p/u for $812 (75% off!):woohoo:. Its good to work at Circuit City.

 

[only1me]

Wow thats alot of money, I just wanted to keep pretty much the stock sound, but use my pioneer headunit. Right now its bypassed the amps directly to the speakers and if you turn it up loud,it don't sound as good as the stock system did, but the stock radio and cd slave died.I know the factory amp though uses low level inputs,so I thought about just going thru the pioneers preouts to the amp, and try it that way, which I'm yet to do.

 

[only1me]

Well I tried it both ways, the pioneer thru the preouts to the factory amps, and it sounded ok, but wasn't very loud.Then I went back to the amp bypass and directly from the pioneers internal amp to the speakers and lots better. I did however use my pioneer's preouts to keep the subwoofer amp,so now its sounds alot better.Now all I need is to get better front and rear speakers.