Ive got
2 8" subs 1 MTX 300rms N 1 RF 300rms (4 ohm SVC)
1 kenwood 8405 700watt 4 channel amp
2 Alpine 5" speakers 90RMS
2 Sony 6 x 9 130 RMS each.
1 kenwood deck 6 pre outs

whats the best way to wire them and would it be better if i bought another Mono block amp for the second sub. This is my first build and im also alittle confused on my amps specs. which state it can only handle 180 watts x 2 bridged@ 4 ohm even though its 700 watts rms not max.... also would running my alpine and sony speakers off the decks pre outs satisfy them?
Thanks for any and all help guys

 

First off I wouldnt run two different brands of subs together regardless if the rms rating is the same and even if it's in separate boxes.

That 700 watts you are talking about it's max.

Buy a mono block amp to run the sub stage when you figure out what you will be using, and you can use the 4 channel for your front stage.

 

Agrees with Sonic

 

Best way to wire with a monoblock is simple. Run the sub preouts to the monoblock, and use ONE of the subs (mixing different subs is usually a bad idea)

Then use the other 4 preouts to run to the Kenwood amp and wire each speaker to each channel, giving them each 60w RMS (I assume all of your speakers are 4 ohm)

If you want to use the Kenwood for everything, then wire the speakers in parallel to the two channel (Alpine left and Sony left on channel 1, Alpine right and Sony right on channel two), giving them 45w RMS each, and then bridge the last 2 channels to run 180w RMS at 4 ohms to ONE of the subs. You will then only use 4 of the pre outs (front and sub) and lose the ability to fade from front to back speakers.

I suggest you try to trade one of the subs for an amplifier. Doesn't have to be a monoblock, a decent two channel (150w x 2 at 2 ohms) would work great bridged.