Best way to hook up my subwoofers?

Question

I have 2 AudioBahn 10" Subwoofers, and together at 1800 watts Peak Power and 900 watts RMS Continuous Power . SO individually there 900 watts peak and 450 watts RMS. The Subwoofer is a 4 Ohm Single Voice Coil. Now I haven't bought an amp yet, but I found a 1000watt Nitro amplifier. It is a four channel amp at mono bridgeable and stable at 4 ohms heres the other Specification for the amp ONLY.
Number of Channels: 4
RMS Power (4 ohms): 40 watts x 4 chan
RMS Power (2 ohms): 75 watts x 4 chan.
RMS Power (1 ohm): Not Stable
Bridged RMS Power: 150 watts x 2 chan.
Peak Power Output: 1000 watts
Min. Impedance Unbridged: 2 ohms
Min. Impedance Bridged: 4 ohms
THD @ Rated RMS Power: 0.03%
Speaker Level Inputs: Yes
Amp Preamp Outputs: No
Built-in Crossover: HP (50Hz - 1kHz), LP (30 - 250Hz)
Bass Boost: 0 - 18 dB
Signal-to-Noise Ratio: 95 dB
Fan Cooled: No
Fuse Rating: 40A
Warranty: 1-year Manufacturer's

Answer 1

M S is a little off. You can't get 300 watts to each sub with Bridged RMS Power: 150 watts x 2 chan. Impossible.

The only way to wire this system up is bridge the amp to two channels and put each sub on each bridged channel. Each sub will only get 150 watts RMS.

This is because the amp is only 4 ohm stable in bridged mode, since the subs are 4 ohms each...there's your answer.

You actually better off with a bigger mono amp that can push those subs a little better. Something in the 400-900 watt RMS range @ 2 ohms. Thus wiring the subs like so http://i81.photobucket.com/albums/j230/sparky3489/PARALLEL.jpg for 2 ohm operation.

Answer 2

Set the two speakers up to two amp hookups "channels" in PARALLEL wiring.

In theory 150watts*2 channels (all this power through one channel, in parallel to make it 2 ohms resistance) = 600 watts RMS total, 300 per speaker...double the output of a serial/"bridged" setup.
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Note: the below answerer was indeed right about the 2 OHM set-up being for parallel....I was assuming your speakers were of 8 OHM resistance (like my PA speakers) rather than 4 OHMs (like your car audio subs).

The equation for a parallel setup is

1
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(1/resistance speaker 1)+(1/resistance speaker 2) =

1
------
(1/4OHM speaker)+(1/4OHM speaker) = 2 OHMs

You said "Subwoofer is a 4 Ohm Single Voice Coil", that's where I got that from...so by "bridged", they appear to mean PARALLEL wiring not serial wiring (so you can't get the extra multiple of 2 for power, it's only 300 watts RMS output).

Here's an explanation and diagram of how to do it
http://www.installdr.com/TechDocs/999016.pdf
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You will probably want to check your manual for advice on parallel wiring...judging by the specs as I read them I believe this setup gives 2 ohms output (not 1 ohm, which would be dangerous), but if I were you I would double check to be sure.

Answer 3

First of all, for subwoofers you want a 2 channel amp, a 4 channel amp is usually for your midranges and tweeters. But if you're gonna' get the 4 (which I don't recommend) than you should wire the speakers parallel and bridge them. That's the best that you can get from it.