Here it goes the amp powers on and seems ok nothing happens for a second then it whines through the speaker and the led light goes down in brightness and it lites back up and does it again after a minute or two it does it again have been having a problem with the frequency control on the amp and last weekend it blew a 60 amp main fuse it is a mtx thunder 6500 d running a 10 inch thunder 5500 any advise?
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Do you have an amp or it's this running through an amp? If so sounds like it's a thermal issue to hot. If it's not hot check to see if it's got a good connection on power or ground. I've seen this happen where the radio turns it on for a couple seconds the sees an issue and shuts back down. With or with out amp, could also be blown speaker shorting out. Can unplug one speaker at a time till radio stays on or check each speaker with an ohm meter, should read 4ohm with no current going into speaker. I've seen that happen also with bad RCA cables going to amp. If is an amp you can check the light on the amp to see if going on and off, unhook Rca cables then check to see if amp stays on. Hope that helps
Yep, chalk that one up to poor design...The amplifiers are going out of balance during power up and down. Two seconds is pretty long... Try turning down the gain during power on and see if that affects it.
The pop on turning off is normal... None of these have speaker disconnecting hardware that is necessary for very high power amps. The biggies have hardware that checks amplifier is balanced before connecting the speakers and a relay also cuts the speakers immediatley on power down. As power goes up and down the circuitry comes to equilibrium and until it does, strange things happen.
I would investigate the CONDITION of the filter caps for the main power because if they age to a higher internal resistance that COULD cause the high freq oscillation on power up... Two seconds is MUCH too long.
There should also be some non-electrolytic caps NEAR the power output transistors to handle high frequency supply power bypassing.
Check the power bypasses that service the preamp stages. Look for pregnant electrolytic caps that have failed.
Ultimately, you MAY need an oscilloscope to isolate the high freq problem.
Overload maybe. If the amp is run at an improper impedence, the amp will shut down. If you are "CLIPPING" speakers / subwoofers the light will blink to indicate a hard clip . Example: 4ohm/2ohm stable amp with 4 ohm subs wired at 1 ohm.
check your output stage for bad speakers cable or bare wire of cable touch the body of amp----short circuit speaker cable----bad speaker it self------ bad input cable or defective input device . disconnect all and check if it is ok---start to connect one by one from input to outputs------if all above failed you must contact service center for help.
This is common when the output transistors have failed. The amp powers up and the amp senses a problem and goes into protection mode. Generally, there is a protection LED but not all amps have them.
To be sure that the problem is not installation related, check the DC voltage across B+ and ground when the amp tries to power up. If the voltage remains above 11 volts, the problem is almost certainly due to a failed component in the amplifier.
Disconnect the signal lines and all speakers (disconnect the wires from the amp terminals) and try to power it up. If it powers up, you could have a defective speaker or defective wiring. If the amp still fails to power up, the amp should be checked by a qualified tech.
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