What's wrong with this amp? PICS inside

[shizzzon 10+ year member]

it's a 1 ohm stable amp, i am giving you guys the DCR value, not the nominal value.

There is 2 dual 1 subs independently wired in series then both parallel at the amp.

Hence, resistance = 0.6DCR

I had the thought already if rise at the note being played was so low that it dropped below 1 ohm but i already tested that theory.

I got another amp and hooked it up to the subs and rise on that note is over 4.5 ohms so it wasn't that either.

 

[shizzzon 10+ year member]

Being that he says amp is irrelevent possibly means something cheap or unpopular

Nope, that means that i do not want a negative image on the company.

It's better to respect a company's reputation than to post ***** about a single problem compared to the 1000s that are fine.

 

[cx-7heaven 10+ year member]

Nope, that means that i do not want a negative image on the company.
It's better to respect a company's reputation than to post ***** about a single problem compared to the 1000s that are fine.

Fair enough, but from what I have seen in the past, blowing a rail like that is caused by impedance problems/ shorts.

 

[MakeshiftAudio 10+ year member]

How about tell me via PM the name of the amp so I have an idea of what I'm trying to diagnose...?

Edit: I've seen many rail problems like that from strapped amps as well.

 

[Grinder1989 5,000+ posts]

That looks like a Sundown 3000D

 

[shizzzon 10+ year member]

Fair enough, but from what I have seen in the past, blowing a rail like that is caused by impedance problems/ shorts.

You are right! that's why i'm confused...

It doesnt make sense. It has to be something internal and not user error since i was testing it the whole time.

We had great voltage input, yet we couldnt even make it to a clipped wave before it gave out...

Impedance rise was well over 4x rise resulting in a minimum of 2.4ohms seen by the amp which is 1ohm stable.

 

[cx-7heaven 10+ year member]

You are right! that's why i'm confused...
It doesnt make sense. It has to be something internal and not user error since i was testing it the whole time.

We had great voltage input, yet we couldnt even make it to a clipped wave before it gave out...

Impedance rise was well over 4x rise resulting in a minimum of 2.4ohms seen by the amp which is 1ohm stable.

Are you absolutely positive that your wiring was good, and not shorting to anything? I know when I am testing, usually my wiring is not set up to be anywhere near show worthy.

 

[slim2fattycake 10+ year member]

It was not show worthy but I made sure that it would not be able to short off anything.

 

[shizzzon 10+ year member]

i checked everything that the user had wired before and after it smoked.

Nothing was shorting anywhere outside the amp.

The amp was already installed in the vehicle and had been used once already but for a very brief period at low volume to ensure it worked. this was a week ago.

It was then permanently installed in the vehicle either yesterday or today and has been running at low volume levels until this afternoon when it went...

 

[cx-7heaven 10+ year member]

If it is a sundown as suspected earlier, you should have no problem getting warranty on it, or at least the 5 year discount replacement

 

[slim2fattycake 10+ year member]

It is not a sundown. Lets just say this is no where in the region of a cheap amp.

There is no more warranty on the amp either.

 

[cx-7heaven 10+ year member]

With my amazing p.i. skills I have deduced what amp you have there. I would still talk to the person, I understand they have very good customer sevice.

 

[Grinder1989 5,000+ posts]

Probably a Cactus.

 

[slim2fattycake 10+ year member]

Nope.

Someone suggested the PWM IC was defunct, replace with a TL494, and do the routine fet replacement. But he doesn't know why this happened.

 

[shizzzon 10+ year member]

Someone else just did some lookin and they believe that the pin that got destroyed on that chip, Pin #7 is definitely ground and that would normally be caused via a short in the amp.