I'm planning on buying the same box and putting two MTX 6404s in it. (2001 F-150 4x4 OffR Extended cab)

Problem is where to store the amp.

I don't want to raise the seat any, since I have close to no headroom back there as it is.

I'm assuming that it's not good to bridge a 2 channel amp to two subs, although I did it successfully for 5 years in my 94 Ranger. Working on that assumption, most of the amps I find that will put out 250x2 bridged are seventeen freaking inches wide. Is this a faulty assumption I'm making that bridging an amp like that is no good? I'm planning on trying it anyway with the new subs since I'm going to continue to use the PA1002 if I can, at least for a while. I can fit this easily under the seat, but if for some reason I have to get a 4 channel amp I can bridge to those MTXs, I'm SOL.

On a side note, I was also using the line outs on my old Sony HU as well as the amped output (line outs went to the sub, amped output to the stock speakers with the bass turned all the way down). Was this bad? I oringinally had a 25x4 amp for the mid/highs but lost it along the way, and was broke.

 

Its fine to bridge a 2 channel amp to 2 subs if the amp's ohm stability is low enough, unless your subs are 2 ohm or 1 ohm subs, youll have no problem with most amps. I suggest a class D amp for your subs, they are very efficient and take up little space. An mtx class D amp that puts out about 650 watts rms im not sure at what ohm, probably 2 ohms, is small enough to fit under one of your front seats in your truck with no problem.

 

Since bridging two channels cuts the resistance load in half, that'd be parallel wiring, eh?

I kept trying to do it with math to figure it out, but since I don't know the circuitry inside the amp, it makes it kinda hard

 

Since space is such an issue, consider using a class D amp. They throw off less heat and provide a lot of power. I would recommend the MTX 4250D (400w@2ohm), JBL 300.1 (300w@2 ohm), and Memphis ST500D (500w@2ohm). The Memphis is the smallest and will do a great job on the MTX subs.

links www.memphiscaraudio.com
www.mtxaudio.com
www.jbl.com

 

One thing I'm confused about (let's take the 4250D as an example).. It says 250w x 1 at a two ohm load, which is where I'd be at. But I've got two speakers, and if I bridge them, aren't I still effectively using two channels?

(ok, just paid attention and apparently can't bridge the MTX Class D, if any D amps.)

Is it possible to get two speaker output of of this amp? How would I wire it? It'd ahve to be parallel to reduce the load to 2 ohms, but ....

 

Ok, looking at this diagram...

http://www.jbl.com/car/SubwooferWiring/2-4-2.asp

That's parallel wiring. What is the wattage difference between this and if I were to bridge both speakers? Is that what they're functionally doing here?