Hey av8ter
yes I have the dsc480.
The 480 & 4125 difference is wattage.
For the 4125
1) 500x2 bridged will give you 500 per side in Mono channel
2) if you bridge the amp into 2 channels you need to put
amp in 2 channel mode( 2 or 4 channel).
3) if you want stereo into 2 channels you need to use a Y-adapter.
4) if you use the amp in a 3 channel mode you still need a y-adapter.
You can use channels 1-2 for the front & 3-4 plus the mono out puts
as the sub out puts into 4 ohms.
The reason I asked who made these amps was because I called maxxsonics asking for spec,
which there tech support didn't have much info on this.
I needed to know what is the rated power @ 12 volts which they don't know,
& they don't give these specs in there manual, website or any place.
I did ask them one other question, I asked them where was channel 1-2 on the amp.
I was told channel 1 was on the left top & channel 2 was left bottom.
They say all there amps where set up like that, not ture.
Channel 1 is bottom left & channel 2 top left.
I mean this doesn't mean anything, but I ask questions at times to see if the
company that makes there products know there own gear.
I think the dsc amps are built very solid, nice HP xover, nice warm sounding amp.
Very very great buy of amp, I like this amp better then my pheonixgold amp.