Alright so I've got a 121m xtant amplifier feeding a 10" sub. It worked until recently. I've checked the rca cables and connections, they're good. The red light is on and no orange or yellow lights are on. I checked the voltage on the power supply and continuity to ground, all good. The confusing part is that when I check the voltage across the speaker outputs I don't get anything on my multimeter (in the mV range). I do get a varying mV voltage across the postive (or negative) terminal with respect to ground...
Not sure what is wrong here, checked the jumpers and everything looks good...
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check your subs by connecting them straight from the stereo. If they work then there is an issue with the signal comming from the stereo through the rca cables to your amp, check those. Try another amp if you can with those rca's or test the amp with a friends car, either way try to rule out everything until it points to the problem.
Disconnect the wire from the speaker and meter it out. check it for a dead short, the meter would read 1..... You can also check the action of the sub by pushing on the center lightly, moving the cone. If it's blown, it will not travel smoothly. If your meter reads ......1 then you've really done it and totally cooked the wire clean thru, thus no resistance. Hope this helps.
Does it happen at all volume levels?
What is the gain setting on the sub amp?
Have you checked for 12V @ remote turn on after problem occurs?
Sounds as if the remote turn on relay inside the amplifier is losing signal, or has become damaged. If the protection light does not light up, the problem is not thermal, shorting, or high/low voltage.
The amplifier is in need of repair. This is not an end-user fix. Looking at about $50 to repair.
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You can plug into the left channel and it will feed both the left and right channels.
To confirm that it's feeding both channels, connect the speaker to one channel at a time. With signal fed into the left channel only, you should get sound when you connect the speaker to either channel.
hi, first disconnect the rca input, then switch on headunit and if the amp produces a constant bass thump it then means it has an internal fault. if the amp idles quietly then replace the rca cable, or try connecting the headunit lineout feed directly to the bass amp, in this way you cud find out if your fault is coming from the headunit or the equaliser. cheers
here is a short test you can try, remove the rca audio cable from the amp & connect a diskman or toher audio o/p device that you can hook up with the same rca wires, turn on the amp & see if you have sound. you can also remove the speaker wires from the sub & using multi meter read the ohm's of the sub, most subs are 4 ohm. Hope this help locate your problem