i have a 1200 watt mtx thunder 4200 series amp..
just bought 2 10" kicker cvr10's (600rms) competition series..

my problem is when i hook the amp into my truck, the subs don't pound like there supposed to.. i had 2 10" infinity's that where pounding earlier in the day, which i took out and sold to a buddy of mine.

I have checked all connections, ran new RCA's, what could be the problem, there is also a crackling noise coming from the subs...

so i took out the 1200 watt mtx thunder, and changed it with my 800watt Sony explode amp..WORKS AND POUNDS PERFECT.. what could be the problem with my amp.. please help me! i want more BASSSSSSSSSSSSSSSSSSSS

Definitely need more info here. What are the coils? dual 2 dual 4 ohm? What box are you running? I can tell you that especially with the added power and change in subs, there's going to be a different box needed

sound like Ohm issues...

you must know the kicker crv 10" 600watt rms, 2ohm...
the problem didn't happen with these subs the h append with my other subs.
i removed the subs outta my truck with the amp running? cud that be a problem? The box is enclosed. no port holes. the 800 watt Sony amp is pounding, but i really want the 1200 watt one to be working..

amp not tune properly?
improper box?
wrong ohm configuration(could be running them at 8 ohms who know?)
could be many thing...
i mean 1 amp can probaly handle 1-2 ohms
does infinity could of been single 4 ohm voice coil and the crv are single 2 ohms?
lots to check (that my 2 cent don't flame me i had the same issues with friends)

everything on the amp is turned all the way up..
the crv are double 2 ohms. i got a wire going from neg to pos on both..
it works great with the 800 sounds like shit with the 1200

probaly the amp doesnt play 1200 at that ohm?

Definately sounds like an impedance issue.
How are you wiring the subs to the amps?
How do you have the subs wired? Use a DMM to verify the final load.

I've done a quick Google search to find out more about the MTX, but cant seem to find anything.
Maybe an exact set of model numbers will help us help you.

ive got the subs bridged to the amp..
ill give u a drawing of how there hooked up in the box.

also i think i might have posted the wrong model number to the amp..
this is the amp here

http://www.mtx.com/caraudio/products/amplifiers/TC4001.cfm