the subject says it all.
3 subs needing 175 rms and 400 max. need suggestions on how to wire and what kind of amp i will need.

 

How to wire depends on what kind of amp; how much power it has and if it is stable down to 1 ohm or not. Also, are they 4 ohm SVC subs?

 

yeah they are rockford fosgate 12's they are he. they take 200rms 400max. i was thinking a 500watt class d mono amp.

 

I would say run them parallel, and that should put you at a 1.3 ohm load, if not somebody will correct me. Then I would look for a good class D that is 1 ohm stable. I have a HiFonics Brutus in my truck and I know that line is 1 ohm stable, and they are good strong amps. I have the 1500 watt, but they make a 1000 and 500 as well. I would consider trying to go with 600 watts or more for what you are doing. The only time I have run into problems with my amps is when the subs could take more power than the amp could dish out. Usually what happens is people end running the amp at 100% to get the desired effect. Spend a little more now to get a bigger amp and let it with ease.

 

the subs are dual voice coil. will this make a difference on that ohm load?

 

The dual voice coils makes a huge difference. Wired in Series parralel your looking at 2.67 ohm and wiring them parralel will put you under 1 ohm. If it were me, i'd think about dropping one of the subs and would take a good look into hifonics class d amps. If you stick with the 3 12's, a 1500 D would push them plenty wired up as above. If your looking to stick with RF, take a look at P6001bd.

You got room for the three 12's in a truck?

 

yeah man i got plenty of room with no backseats. thanks a bunch. ive got a hifonics 1500 class d.

 

If you want something that will sound awesome I would suggest a jl audio 500/1 class D it will give you some really clean hard pounding power it is worth the $$$