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I have a 15" mtx thunder sub( 300 rms) WITH A kenwood (460 rms) sub. When I first connected everything, I had no problems. After a day or two, when I stopped for a traffic light, the bass would cut out, but the amp light would stay on..Once I started driving again, the bass would come back on....Then today the bass cut out again, but never came back on. Where would I start looking to troubleshoot the problem??? Both amp fuses are good??? I have no clue....thanks!!

 
Rep Power: 400

which light would come on? but right now it sounds like a connection is loose. ground is always a good place to start. always make sure its against bare metal. also recheck your crimping.

 
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What is "crimping"? <--- n00b @ audio

 
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If you have a stock electrical system, then i'd say it's a power issue. When you stop, the alternator is not putting out as much power for the sub. Once you start driving again, the alternator would produce enough to power your sub. A 15" sucks up a lot of power. I'd say, you get a capacitor. It would solve your problem.

This is a cimping tool. Crimping is the process of connecting wires by using crimps.

 
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Thanks!

 
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Thanks...I will try these tonite

 
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I doubt it's that the car cannot provide enough power to the amplifier.

Could be numerous things..

signal cutting out (less likely)

bad ground (somewhat likely.. the amp has capacitors in it, and the LED indicator light can stay on for many, many seconds after power is cut)

The amp could also be going into thermal overload or another form of overload protection.

Sub could be blown, wires could be loose leading up the sub (this one just might be it!!) Check your speaker wires inside the enclosure and between the amp & enclosure.

Swap your amp with another amp, or swap the sub and run it off your current amp. Test and eliminate possibilities.

 
Rep Power: 285

I highly doubt its an alternator problem as well. A capacitor will most likely not help you out in this situation.

My vote goes for bad ground, as I've seen it so many times, and its very common. It could be the other issues that "A03" stated as well.

 
Rep Power: 292

thanks, it seems like every ground I choose is bad...lol...ive tried 3...:-(

 
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are you grounding to points with paint??? if so, you need to sand off the paint, and ground it to bare metal.

 
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your subs could be presenting a low ohm load to the amp, putting it into protect mode.

 
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Fix it yet?

 
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im gonna play with it today and ill post my results.......

My sub is a dual voice coil sub, but its wired to 4 ohms

 
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Update** I guess I didn't wire the sub correctly...lol...I downloaded the wiring instructions from mtx and it looks nothing like what i have now....lol......so im gonna rewire it today and see. I thought a dual voice coil sub could be wired to 4ohms, but I guess it can only to 2ohms for a single sub.

 
Rep Power: 262

it can be wired for 4 or 2ohms try this, on one coil connect the positiveand negative, then connect a wire from the negative to the negative on the other voice coil, and then run the positive to the positive of the other VC, this will be 4ohms. 2ohms just connect the positive and negative to one vc and then same thing on the other side.

the grounding makes alot of diff, but if you drilled a hole in the trunk to use a screw to ground the amp, it really wont make a difference if there is paint or not because the screw will just ground the wire. Circuit City solders Sh*t stay away from there