Suggestions for Amp/Install

[eyal8r 10+ year member]

Hey guys-

I just picked up a box with 2 - Rockford Fosgate P2 10" Subs. Their website says they are 250w RMS/500w Peak. I haven't been in the car audio realm for a LOOOONG time. I need a suggestion for a decent, but cheap, amp. I don't know how many channels/watts I need to look at. Can someone help me here? I see lots of amps for sale on craigslist- just wanna make sure I get the right thing and not blow my speakers!

I have a Kenwood deck, it has pre-amp outputs on it for a sub. I have factory speakers, which is fine for now as I might not keep this car very long.

Can someone direct me as to how may watts/channels/doohicky/thingamabobs I need to power these speakers decently?

Thanks!

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[john denver 10+ year member]

how many ohms are the subs

 

[eyal8r 10+ year member]

I was just reading about that. I have no clue- how do I find out?

 

[john denver 10+ year member]

if you have a digital multi meter just set it to check ohm load and put one probe on the positive the other on the negitive will give you the ohm load and you can pick and amp based on that number otherwise you will have to pull them out of the box and check the back of the magnet

P2D210 would be 2 ohm

P2D410 whould be 4 ohm

If its already wired up its either has a two ohm load or a 4 ohm load look for a amp that does 500 at 4ohm probably

 

[eyal8r 10+ year member]

ok, it says they're Dual 4 Ohm. PD2410.

 

[eyal8r 10+ year member]

btw- there's no polyfill inside the box. Do I need one? It seems to be some sort of bandpass box...

 

[john denver 10+ year member]

btw- there's no polyfill inside the box. Do I need one? It seems to be some sort of bandpass box...

you shouldnt need any polyfill are they already wired up

 

[eyal8r 10+ year member]

Yup- wired up just need an amp and hook them up to my deck... I have a pre-amp output for sub on my deck... What specs do I need to look for when looking for an amp?

 

[eyal8r 10+ year member]

sorry for the newbie question- but what's the difference between 1 ohm and 4 ohm? Do they hit harder/deeper/louder or something? Since I took these out of the box, I realized that only 1 side of the woofer is wired up. The other is not at all. So I assume that means my buddy was only running a single voicecoil on these things?

 

[Twisted_0912 10+ year member]

sorry for the newbie question- but what's the difference between 1 ohm and 4 ohm? Do they hit harder/deeper/louder or something? Since I took these out of the box, I realized that only 1 side of the woofer is wired up. The other is not at all. So I assume that means my buddy was only running a single voicecoil on these things?

4 ohm just means more resistance to the amp therefore less power. it doesnt make a sub hit deeper or harder. If he only had one coil wired up then thats not good lol

 

[Twisted_0912 10+ year member]

you need to look for an amp that does 500 watts at either 4 or 1 ohm and wire the subs accordingly

 

[Twisted_0912 10+ year member]

or a 2 channel amp that does 250 per channel at 2 ohm and wire the subs accordingly

 

[john denver 10+ year member]

Wire the sub up like this and get a mono block amp that does 500@4ohm

http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=3964

maybe this and then you can upgrade later their are cheaper though

 

[john denver 10+ year member]

Or like this and get a monblock amp that does 500@1ohm

maybe something like this

http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=4208

 

[eyal8r 10+ year member]

Is one way cheaper for amps than the other way???