Car amplifier and subwoofer impedence question.

[cjchaps]

Here is my setup:
Pioneer GM-X702 amplifier.
Bandpass Subwoofer Box
2 - Orion XTR 4 ohm subs 12" subs.

The amp specs are below. The amp has 1 stereo input, and two speaker outputs. For right now I have each sub hooked up to each output. I know this is not good because you don't want stereo in a sub. The amp has a little picture of which terminals to use for mono. I tried wiring both subs up to the mono setting on the amp and that didn't work because the amp kept cutting out. How should I be hooking the speakers up? It's been a while since I had an electronics couse


Specs:
Bridgeable 2-Channel Power Amplifier Built-In Crossover Continuous Power: (20-20kHz, 0.04% THD): 2 ch: (4 Ohm) 75W x 2 2 ch: (2 Ohm) 100W x 2 1 ch: (4 Ohm) 200W x 1Maximum Power: 2 ch: (4 Ohm) 150W x 2 (EIAJ)1 ch: (4 Ohm) 400W x 1 (EIAJ)1/2/3 Channel CapabilityNo Current Limiting Signal-to-Noise Ratio: 105dB Frequency Response: 10-60,000Hz RCA Input Level: 500mV

 

[tigerbait]

Since your amp cannot handle a 2 ohm bridged load, your only options are 4 ohm stereo like you have been using, or wire the subs in series to get an 8 ohm bridged load. However, this would only result in getting 100x1 (50W for eachs sub), instead of 200x1 @ 4 ohms. You could get some y-adapters and feed the same input signal into both the left and right inputs and then each sub would get 75W.


But really, I'm sure those XTR are hungry for some power. If you can afford it, a new amp will a great improvement. Either get a 4 channel amp, so you can run two separate bridged loads, or get a high current amp that can handle 2 ohm bridging.

 

[Viperoni]

Exactly, the amp cut out because it couldn't handle the low impedance load.
Leave it wired (correctly) in stereo mode, 1 sub to each output.
That's as good as it gets, unless you upgrade your amp to one that can handle a 2ohm bridged load....

I wouldn't really waste time on the y-adapter method to give the same signal....but you can if you want to.
And I'd definetely give them more power; my 10inch Orion XTR (original) in a bandpass box sounds good with my Kicker impulse 352xi amp (35x2/100x1 watts RMS) and then I hooked it up to my home theatre plate amp that's 272watts @ 4ohms.....man what a difference!