My friend has a Power Acoustik sp4x-600 amp. It does 70w x 4 and can be bridged to 175x2 rms. He has a sub to power and the person he got the setup from apparently was using this amp to power the sub. I don't see how you could do this, but maybe it's possible? I"m only familiar with 2-channel and mono amps for sub.
http://www.cardomain.com/item/POWSP4X600
Here's the specs:
* Amplifier Type: Multi-Channel
* RMS Power @ 4 Ohms: 70W x 4
* THD at 4-Ohm RMS Power: 0.02 %
* Bridged RMS Power @ 4 Ohms: 170W x 2
* Speaker Level Inputs: yes
* Preamp Outputs: no
* Built-In Crossovers: HP/LP
* Bass Boost: 0 or 18 dB
* Frequency Response: 20-30,000 Hz
* Signal to Noise Ratio: 97 dB
* Fuse Rating: n/a
http://www.cardomain.com/item/POWSP4X600
Here's the specs:
* Amplifier Type: Multi-Channel
* RMS Power @ 4 Ohms: 70W x 4
* THD at 4-Ohm RMS Power: 0.02 %
* Bridged RMS Power @ 4 Ohms: 170W x 2
* Speaker Level Inputs: yes
* Preamp Outputs: no
* Built-In Crossovers: HP/LP
* Bass Boost: 0 or 18 dB
* Frequency Response: 20-30,000 Hz
* Signal to Noise Ratio: 97 dB
* Fuse Rating: n/a
