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okay. I thinking of getting rid of audiobahn 12" 400 watt sub cannot bridge to 4 ch only mono; and replacing it with a pioneer 12 " TS-W306R 400 watt sub so I can get 4 ohms and bridge it into a 4 channel amplifier. I prob need an 800 watt 4 ch right. RE: I need an amp for the 6/9s cause front is amped, and wanted to add a little rear fill.

Brad, 500 watts will kill your 6/9s.

Here is a rule alot of SQ guys try to follow, and one I think your missing.
K I S S (keep it simple stupid)

What we mean by that is less is normaly better. I only have 5 speakers in my car. 2 mids and 2 tweets in the front, and a single sub. Anything more, and you start geting into cancelation and phasing issues. Read Golemons link, and the rear fill thread in the FAQ section. They both cover these problems very well.

Something else for you, factory headunits don't have near enough power. Even factory systems with amps, only sound so so compared to some of the other options on the market.

Yes you can keep the factory deck, but you need a decent amp for the fronts and the sub. The only way you would need an amp for the 6/9s is if you all ready had the front amped, and wanted to add a little rear fill.

One more question, why 6/9s? They aren't really the best design for a speaker. A nice set of 6.5s will sound much better (also covered in the FAQ section, hint, hint)

the 7 speakers came with the car. They have lots of power from the HU. I only need power to the trunk. will an 1000 watt amp do? 4 channel. 2 to one sub and other two to speakers. Should be over enogh juice right. 500 to sub 500 between the 2 6 by 9's.

[quote]go to the FAQ section.
read the thread of rear fill speakers[/quote]

x2 half of those speakers you dont even need. So dont waste money on them. Look into a decent quailty comp set for your front stage, and thats all you'll need. Unless you really want speakers back there. Just run them off the HU, and get an amp for the fronts.

go to the FAQ section.
read the thread of rear fill speakers

I have a 2006 pontiac pursuit I am Canadian I upgraded the car with a 7 speaker stereo. 2 speakers are already below the back window. So i think i should make a speaker box and put the speakers around the sub. I have 60/40 seats so Im hoping int won't dull the sound to much from the trunk. RE: so does that mean I combine 400 watts + 80 watts + 80 watts = Around a 600 watt Amp to power my stuff?

[quote="BRadGfromMalibu"]The 12" sunbwoofer is a AW1251T Audiobahn
...impendance is dual 4 ohms [/quote]

Just saw this...
You won't be able to use a 4 channel amp, or else you'll end up with an insignificant amount of power for your sub, compared to the power you will be sending the 6x9's.

What you need is a single 4 ohm sub.

If you wish to keep this subwoofer, what I would suggest is a mono amplifier for the subwoofer - you want one that'll make it's full power at 2 ohms (a stereo amp, or multi-channel amp won't, unless it's rated down to 1 ohm stereo, which 99% of them aren't).

Then, I'd rethink this whole "power the 6x9's" thing through.
Read that link I posted.

I'd suggest you'd be better off running the 6x9's off your deck - keep them at "ambient" levels, for rear "fill" - unless sound quality isn't really a focus of yours.
I'd pick up a small stereo amp to power your front speakers - you want those well overpowering your rear speakers (or, maybe you are setting up a 1980's retro car - like big bro might have had - 6x9's sitting up in the rear deck... maybe the only speakers in the whole car... :D ).

Hopefully this helps- selling that sub might be the most practical option, if a 4 channel amp is what you seek - and I wouldn't personally hold Audiobahn to be high on the performance value chart... maybe you want it to show off some chrome? :confused :

I assume you are in Spain?

I never understood the European's obsession with rear speakers... 6x9's in particular. :D

Anyway - that comment really pertains more to a larger design question... more an issue of fundamentals... of acoustics... of sound quality:
Why not invest in your FRONT speakers instead - THEY should be your main speakers, they are what defines your soundstage.
Rear speakers are actually a complex, advanced subject.
Why? Check this out:
[url]http://www.betteraudio.com/geolemon/phasing/phasing.htm[/url]
...now you'll understand my initial comment. :D

But ignoring ALL of that for the moment:

A 4 channel amp can do what you want (or think you want) quite well.

If you bridge channels 3 and 4 of the amp to a sub, while running channels 1 and 2 to your 6x9's, you'll have roughly twice the total power going to the sub as you have to the 6x9's - which generally is actually a nice balance of power, really. Many systems I've done that were a simple component set up front, and a sub in the rear - and one 4 channel amp running just like this. :cool:

However, most 4 channel amps are 2 ohm stable (per channel) which means if you bridge two channels together, you'll end up with one more powerful channel that is only stable to 4 ohms, not two.
...so, your subwoofer needs to be a 4 ohm subwoofer... or if a dual voice coil subwoofer, those voice coils each need to be 2 ohms, and you need to wire them together in series to get the 'final' 4 ohm load that the amp actually sees.

That's critical!

I assume you are in Spain?

I never understood the European's obsession with rear speakers... 6x9's in particular. :D

Anyway - that comment really pertains more to a larger design question... more an issue of fundamentals... of acoustics... of sound quality:
Why not invest in your FRONT speakers instead - THEY should be your main speakers, they are what defines your soundstage.
Rear speakers are actually a complex, advanced subject.
Why? Check this out:
[url]http://www.betteraudio.com/geolemon/phasing/phasing.htm[/url]
...now you'll understand my initial comment. :D

But ignoring ALL of that for the moment:

A 4 channel amp can do what you want (or think you want) quite well.

If you bridge channels 3 and 4 of the amp to a sub, while running channels 1 and 2 to your 6x9's, you'll have roughly twice the total power going to the sub as you have to the 6x9's - which generally is actually a nice balance of power, really. Many systems I've done that were a simple component set up front, and a sub in the rear - and one 4 channel amp running just like this. :cool:

However, most 4 channel amps are 2 ohm stable (per channel) which means if you bridge two channels together, you'll end up with one more powerful channel that is only stable to 4 ohms, not two.
...so, your subwoofer needs to be a 4 ohm subwoofer... or if a dual voice coil subwoofer, those voice coils each need to be 2 ohms, and you need to wire them together in series to get the 'final' 4 ohm load that the amp actually sees.

That's critical!

When you say 'splitting' I'm guessing you mean you want to maintain your factory deck and add an amp and the sub right? not sure of the car, but most of the time you can do this with a line level converter. Basically it converts speaker level, to RCA and you run that to your amp.

Cons of this is, the results are never really that good.

What do you mean by putting 6x9's in the trunk? I hope you don't mean lying on the floor (lol).

Another thing, when looking at specs of speakers and amps. Just ignore the Max ratings, and only looks at the RMS ratings. Max is basically a worthless spec that many manfactures put on the box to make you go 'wow'.