pnthr30

Can someone please explain how I should wire my new sub to get the most out of both the sub and the amp? Thanks a lot.

Sub: 10" Alpine Type R Dual Voice Coil (2 ohm each) (SWR 1021 d)

Amp: Rockford Fosgate 250a2 (2 channel)

ziggdoggaroni

you can only go 4 ohm or 1 ohm on that sub. unfortunately, if you wire it in series for a 1 ohm load, your poor fosgate amp will fry (those models are piss). if you wire it series for a 4 ohm load, you'll only be getting about 200 watts of power out of the amp. those 10's need about 450 watts of clean power to move. you may want to look at a pair of single voice coil 8 ohm subs (see JL audio 10w08) or a dual voice coil 4 ohm sub (kicker 02s8L541). you'll then be able to present your amp with a 2 ohm load... which is still not good to do to those amps. as long as you put an in-line fuse on the amp, you shouldn't kill it.

ziggdoggaroni

sorry about the last post, i meant single voice coil 4 ohm subs. (jl 10w04)

SumAccordGuy94

wire each channel of the amp to each voice coil seperatly. You'll run the amp in stereo, with 2 ohms per channel..... Which will roughly double the power from its 4 ohm rating.

ziggdoggaroni

why would you run a sub in 1 ohm stereo, off an amp that is not 1 ohm stable? the amp can't handle that ohm load. you're telling a guy to do something that will fry his electronics....

lindsj

Seems like SumAccordGuy is saying to put each amp channel on a seperate voice coil. That sounds like it would put 2 Ohm to each channel. The only question then is the amp truley stable at 2 Ohm on each channel. If it is stable at 2 Ohm (which I don't know the answer to) then the idea is sound. If it is NOT stable at 2 Ohm on each channel, then couldn't pnthr30 wire each coil in series (to give a 4 Ohm load) and use his amp bridged? This was your origional suggestion, I understand, but given the units we are talking about, is this really all that bad of an idea. Seems like the 'safest' bet in terms of frying anything.

acuradriva

2 ohm stereo is basically the same thing as 4 ohm mono. you will get the same power. but with mono it ensures the sub gets the same signal.

pnthr30

This is the way that I was thinking it should work.......

bridge the amp (positive from the left channel and negative from the right channel) and then making the following connections.





This should show the amp a 4 ohm load (which it is stable at) and get the most out of my amp, correct?

acuradriva

correct