MTX ground issue

I have a MTX Thunder 421D mono block amplifier pushing one JL 10W6 V2 D4 wired in series presenting a 2 ohm load. I also half a one-half farad lightning audio cap. The problem I am having is with my amplifier and I think it may be due to the ground. Whenever I play music that has a sharp, fast, and not very deep beat the red power light on the amp flickers everytime the bass hits and when I turn it up loud when this is happening my system goes crazy. My sub just starts making all kinds of noise that isn't part of the music and sometimes the only way to get it to stop is to completely turn the entire system off. The amp is wired with 4 awg for the power/ground. I have played around with the ground a lot (moving it to various locations, making sure all the paint was removed from the metal, etc.) and I have had some success in reducing this problem, which is why I beleive that the ground may be the culprit. However, no matter what I do, I cannot seem to completely eliminate this issue. I am completely perplexed by it because I can play hip hop songs that have tons of bass with no problems, but when I try to play some techno, for instance, with a beat that doesn't even hit that hard everything goes to hell. If anyone could tell me some possible solutions to this problem, they would be greatly appreciated. Thanks.

Sorry, I meant to say that it is wired in parallel, not series.

No, the amplifier is not hooked up in a bridged configuration. The subwoofer is on the speaker 1 terminals.

What did you use for RCA wires ? Sounds like an inherent problem with noise coming through the RCA. Did you run the RCA along side any speaker wires or power wires ?Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

I have a triple shielded rca cable routed on the passenger side of the car and the power and remote wires are on the other side of the car. I used to have another 4 channel amp hooked up and the rca's were run right next to the speaker wires going the the amp from the receiver then, but this is no longer the case. However, the speaker wires are still in place even though they're not connected to anything. Is it possible that this could still be causing a problem?

Oh and when I said that the speaker wires were going from the amp to the receiver I didn't actually mean that they were connected to the receiver. I just spliced off the speaker wire there so I didn't have to pull the door panels again.

Darth_soul wrote: I have a triple shielded rca cable routed on the passenger side of the car and the power and remote wires are on the other side of the car. I used to have another 4 channel amp hooked up and the rca's were run right next to the speaker wires going the the amp from the receiver then, but this is no longer the case. However, the speaker wires are still in place even though they're not connected to anything. Is it possible that this could still be causing a problem?

Not likely then. I'm just throwing out possibilities of what may be inducing the noise into your system. What is the output voltage of the RCA's on the deck in comparison to the input sensitivity of the amplifier ?

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

My head unit is a Pioneer DEH-P7600MP. From what I was able to find all three sets of the rca preouts are 2 volts. As far as the input sensitivity on the amp, I'm not sure. It is a MTX Thunder 421D. All I was able to find is that the maximum input is 8Vrms.

Another strike for me. If the output voltage for the RCA's are only 2 volts, then your fine. I can't think of anything right now.Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA