swapped amps now have hum

[noble brown]

originally I had a kicker dx1000.1 and 2 swr12d2's with a crossover. yesterday I added a 2nd battery. the 2nd has the ground going to the chasis and ground from the amp to the same spot that the 2nd batt is grounded to (its a 07 buick Lucerne) . I ran the amp yesterday after install and no problems or hum. today I swapped out the kicker w/ a mtx 81000d. the amp is a mono but has 4 terminals, so I bridged. not sure if this can be the problem but it appears that using all 4 terminals giving em a 4ohm load the amp will see a 2ohm load since internally its a mono, is this correct? all batt wires are 1/0. from the distro block to amp is 4gauge. do I have a ground loop problem? it was fine before the amps were swapped out tho.

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[pickup1 5,000+ posts]

Swap the amp back in...probably the amp....or turn the gain down.

 

[noble brown]

it was the way I had the speakers wired. its a mono amp w/ four terminals just like a two channel so giving each pair of terminals a 4 ohm load presents the amp internally w a 2ohm load.

 

[BoomTaco64]

that amp is a mono block amplifier. cannot be bridged. there are more speaker terminals so you are not cramming wires into one spot if using multiple subs.