Hooked up mtx thunder 5604 and when the bass hits the speakers flex all the way out then thell go and flex all the way back in and thell do that,with the bass down

if you turn the bass setting in your radio down it will take the bass out, but may take some of the bass out of the subs as well, if this occurs and you still are not satified, you either have to get a car receiver with a non fading subwoofer preout, or you could get bass blockers for all the speakers you dont want the bass in

Ok, what is the problem ?

Inspect speaker for loose wires/broken wires. Check inside box for loose connection. Blown fuse on amp. Ive literally pulled the wires out of the speaker. The little mesh ones from the terminal to the cone. Look for that. If you do find something broken or bad. remember you can call MTX and fix for a flat rate on most evrything they carry. Ive sent several amps there. normally around $100

Usually a power rating is a power rating, 1000watt rating is a thousand watt rating. The amp will put out 900 watts at 2 ohms.

http://www.mtx.com/caraudio/archive/NDM185.pdf .... go to this link for more help, it is the owners manual

Sounds like your sub is overextending itself, and possibly losing contact at the voice coil. Overextending will make a weird rattling sound, losing contact at the voice coil will make a popping sound.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

I am guessing the bass control is just a potentiometer that you plug in. It could be open and that is why the bass dies. As far as the switch goes, I am not familiar with the amp but it sounds like a crossover between low frequency and subsonic frequency.

the amp is under to much pressure get a bigger 1

okay u will have to troubleshoo the amp.....dose the amp light up?...when u have the radio on? also check your sub wires.going to the amp....make sure the rca'sare hooked up to the radio rear out puts are the radio sub out puts...and then test your amp gain adjustment...let me know if that work's

could be bad mosfets or outputs, needs replace