The better 4 channel Fosgate is like $750, so I'd have to save up a bit before I went to splurge on that. I saw some guy selling a really old 4 channel fosgate amp for $175 on here in the buy/sell, what's the deal with getting a much older amp? Let me find the photo of it.. It's a 600a4 it says.



Better to just wait and buy a good new one, or would something more $200-400ish be okay used from a store or something? Seems like it's all about the brand and the size?

 

The chance you take on used is simple, is it as advertised, will it work and if it dies are you willing to walk away from it and purchase what you should have in the first place?

Figure out if you are a do it once and do it right kind of person or are a risk taker. I just had a demo Pioneer amp show up to my store, the PRSD4000F and it will deliver the performance you need in the budget you have to spend. It carries a full 2 year warranty on it as well. This will allow you to save some $ and put it towards a better set of front component speakers or add some rear fill speakers if you like.

 

I have a black grill Fosgate 400x4. You could offer me $300 right now, cash, and I wouldn't take it, even tho I know I could buy a brand new Fosgate that is the new version of the same amp.

That being said, you're not going to use the 4-channel you get now for subs in the future. Therefore there is no need to get the Power series, if you are going with Fosgate. The P400-4 is perfectly fine, whats the price on that? This is the same amp as I have now, just that mine is from 1995, lol. I'm very attached to mine tho and wouldnt' trade it to you even for the brand new one.

The P400-4 is rated at 4x50wrms @4ohm. Fosgate always under-rates their stuff, so expect more power still, but this doesn't make a diff as 50wrms is plenty.

Ideally, with any 4-channel amp (but using the Fosgate for the example), you can run two channels bridged into a 4ohm load for 200wrms, and run the front stage with the two other channels for stereo at 100wrms x2 @2ohm.

The way to get a 2ohm load in the front is either to get two 4ohm speakers per channel connected in parallel or get a set of 2ohm components/speakers.

My first setup was using the 400x4 I still have.
I had the rear channels bridged to two 10" 8-ohm subs wired in parallel for a 4ohm load.
The front channels were each wired in parallel to a 4ohm 5.25" Boston Acoustics components set and a 4ohm 6x9 coax speaker for a total `2ohm load. It was amazing really.

When I was ready to upgrade, I added a mono amp and powered the subs with that, and used the 4-channel just for the front stage.

What do you have so far?