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i have a fosgate 801x, which is 4-channel and

100w x 4 @ 4 ohms RMS, and
400w x 2 @ 2 ohms RMS

if i'm wiring this to four 4-ohm single voice coil 12's, is there any way I can wire them so that the amp is bridged, thus giving 200w x 4 RMS (double the power)

...basically, I need to know if it's possible to have the amp bridged @ 2 ohms w/ all 4 speakers

 
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the amp is 100w x 4 at 4 ohms and 400 w x 2 at 4 ohms, not 2

basically theres no way for you to do what you want. youre stuck at either 4 channels, each at 100 watts, or 2 channels, bridged at 8 ohms, giving you 200 each..
regardless, with your wiring youre stuck at 400 watts

 
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arggh, i was afraid of that. I'll probably just keep my old amp too (was gonna sell it for some extra $$). That way, I'll have a:

500x bridged to 250x2 RMS on the ts-w304c's (300W RMS each)
and a
801x bridged to 400x2 RMS on the ts-w305c's (400W RMS each)

...should be a nice improvement

 
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not really...

to begin with, having 2 diff kinds of sub never sounds all too good. you get cancellations and phase issues (some bass notes come out louder than others)

on top of that, running 2 diff amps to 2 diff kinds of subs is just another way to as for more cancellation and phase issues.

my reccomendation:

the 801x you could probably sell on ebay for 200-250ish

the 500x you could probably sell on ebay for 150 to 200ish

thats 350 to 450 dollars youd be making

then go to ebay buy a hifnonics brutus 1500 (sell for 301 shipped brand new on ebay)

youll have almost 400 watts per sub from one amp.

that will kill one of your 2 possible sources of cancellation, phasing, and sh*tty sound

 
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hmm, a very helpful person you are!

I might just do that

 
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he not help full HE IS GOD