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Old 09-01-2015, 01:34 PM
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Default prevent output blowing??

Okay do you guys know of any way to help prevent an amplifiers speaker output from going out?
Back in the day I remember buying an earthquake amplifier and in the instructions manual under speaker wiring to the amp they showed a fuse on the + side of the speaker wire?? I believe it was like 10a or 20a fuse
I recently put in a DD M45 amp 500x1 and in 3 days the output was gone then I put in another DD M45 both new, and in 1 day the output was dead? Then I put in a new crossfire 600d a week later no output but this time 1 sub was burnt out the other sub was fine, so I put 2 new subs D4 down to 1ohm and no out put i guess when that 1 sub blew the output went too? what the hell 3 new amp
Help me please.

DD said that the power supply to both new M45 amp were blown I asked how this is possible they said the gain was a bit low? and that the customer probably put to much boost or loudness through the stereo and blew the power supply.
I dont get it all 3 amps showed a green light still just the output went out I dont get it
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Old 09-01-2015, 01:51 PM
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Power supply is not output. Power supply blowing is usually low voltage or clipping
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Old 09-01-2015, 01:52 PM
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What's your electrical system consist of?
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Old 09-01-2015, 02:03 PM
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I just talked to DD again the tech guy said that because the low pass filter was set to low and that the subsonic was to high straight up 20-50hz, thats why it blew the amps, low pass starts at 50hz all the way back and ends at 250hz all the way front he said i should set it around 1 o clock, that 80hz is right there doesnt seem correct idk?
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Old 09-01-2015, 03:11 PM
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80hz is common for subs
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Old 09-01-2015, 04:06 PM
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Quote:
Originally Posted by korey_hofer View Post
80hz is common for subs
I know that the position of the adjustment at 1 o clock doesnt seem like its 80hz looks like 175hz there is 9 total dots starts at 50 then i calculated 25 per dot and ends at 250hz
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Old 09-01-2015, 05:20 PM
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Quote:
Originally Posted by djscrubb View Post
Power supply is not output. Power supply blowing is usually low voltage or clipping
Bingo. What was your voltage like under load? I assume you were using the same wiring for each amp, and there could be a poor connection somewhere (loose fuse, ground/power wire, etc) or simply not enough capacity in your alternator and battery. If you were clipping the signal you could have dropped your voltage very quickly under a heavy load like a loud, extended bass note.

You can fuse the speaker wire if you want, although it won't help you in any way. I think Boston Acoustics put fuses in some of their subs to protect the coils in case of overpowering.

Whoever is giving you advise on why the amps have blown doesn't know what they are talking about.
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Old 09-01-2015, 05:30 PM
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Originally Posted by SPLEclipse View Post
Bingo. What was your voltage like under load? I assume you were using the same wiring for each amp, and there could be a poor connection somewhere (loose fuse, ground/power wire, etc) or simply not enough capacity in your alternator and battery. If you were clipping the signal you could have dropped your voltage very quickly under a heavy load like a loud, extended bass note.

You can fuse the speaker wire if you want, although it won't help you in any way. I think Boston Acoustics put fuses in some of their subs to protect the coils in case of overpowering.

Whoever is giving you advise on why the amps have blown doesn't know what they are talking about.
I was running 8g ofc with a 60a fuse, ground was on point 4g ofc, and no pinched wires, I took the power wire out now and checked it replaced it with 4g ofc,
Yeah DD said that because the low pass filter and the subsonic filter were almost cancelling each other out it created resistance and that why the power supply blew,

Said the customer was at fault but then they fixed the 2 amps for free
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Old 09-01-2015, 06:55 PM
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Quote:
Originally Posted by shaker1 View Post
I was running 8g ofc with a 60a fuse, ground was on point 4g ofc, and no pinched wires, I took the power wire out now and checked it replaced it with 4g ofc,
Yeah DD said that because the low pass filter and the subsonic filter were almost cancelling each other out it created resistance and that why the power supply blew,

Said the customer was at fault but then they fixed the 2 amps for free
Either you misunderstood what he said or he's not qualified to run support lol.

What he might be eluding too is the if the subsonic and lpf were overlapping you might have been raising the gain or boost too high to compensate but that wouldn't blow the power supply. Power supply blows from too low of voltage or too low of impedance/too much power or vibration damage. Filters wouldn't cause the amp to blow.

EDIT: that's really on the small side of wiring.. Especially for a long run or if you have a bad connection. Definitely think voltage was to blame.
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Old 09-01-2015, 07:57 PM
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hell it is 500w.... if he had no rise!!!
8awg is fine for that.
i would say bad ground somewhere, even if you have a great ground to metal it may not make a great ground back to the batt/block.
maybe even a bad fuse/loose connection.
any chance you are over driving the rca input with like 6v?
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