need help with 4 channel bridging for 2 subs

[chrismredblack]

i have a pioneer gm-x524 400 watt amp. i want to bridge the amp to my 2 12" polk audio subs. but i dont know how please help:dunno:

[Simple]

Originally posted by chrismredblack
i have a pioneer gm-x524 400 watt amp. i want to bridge the amp to my 2 12" polk audio subs. but i dont know how please help:dunno:

chrismredblack, I see the specs of your amp are as follows:

Continuous Power (20Hz-20kHz, 0.08% THD)
4 ch: (4 Ohm) 50Wx4
4 ch: (2 Ohm) 60Wx4
2 ch: (4 Ohm) 120Wx2
Frequency Response: 10Hz - 50kHz (0,-1dB)
Total Harmonic Distortion: 0.004% (1kHz, 4 Ohm)
Signal-to-Noise Ratio: 105dB (IHF-A Weighted, at 1kHz)
Bridgeable 2/3/4 Channel Capability
1-Ohm Stable Operation


The fact that it is reported to have 1-Ohm Stable Operation is a good thing, but I am not sure it will do you much good...

What model of 12" polk audio subs do you have?

[chrismredblack]

2 polk gxrs 365watt max

[Simple]

Okay - I think your amp is going to limit the possibilities here. Being that it is a 4 channel amp, you can make it the most useful in bridged 2 channel mode; giving you 120w x 2 into a 4 Ohm load.

Unfortunately, if you wire your subs in parallel, then you will get a 2 Ohm load, and series will give you an 8 Ohm load - neither of these options is good for the amp you have.

Best bet would be to bridge the amp into 2 channel mode, and run a channel to each sub (left channel ‘+’ and ‘-’ to one sub, right channel ‘+’ and ‘-’ to the other sub) - giving you 120w into each sub.

Hopefully you can make the signal mono into the amp and out to the subs too. I hope that helps…

(Of course the best course of action would be to get a mono Sub amp that can drive one channel at 2 Ohms, and wire your subs in parallel to give you a 2 Ohm load into your amp)