Phoenix Gold Phorum

A guy I work with brought me a Power Acoustik LT980.2 today to repair. It is his son's amp, and he had it running some 12s. Supposedly one day it just quit...

What a laugh. I opened the amp up and the power supply was toast. It uses some nice parts, but is just funny to behold.

There are 6 MOSFETs for the power supply, and 8 output BJTs. This puts it along the lines of a M100, or ZX350 as far as what it should do.

Well, it has 4 fuses, and he had 25A ones in all of them. I dug around online and found it should have 15A fuses.

Now for the funny part, one of the 4 fuses was not internally connected to anything. This is part of the amp's design. The fuse holder was wired to nothing. So, if you blow all your 15A fuses running the amp, one will remain to help you keep going. Truly funny stuff.

Also of note, the bass boost, gain, and all other controls were all the way up. Go figure?

Anyway, I got a chuckle from this so I had to post it.

Also, I put 6 new MOSFETs in it, and the amp is back in action. I also desoldered and removed 2 of the 4 fuse holders and then fashioned an internal plastic plate to cover the holes. At least now the most he will likely stick in there will be around 50A instead of 75A as before (thinking he had 100A).

Thats funny that it had 1 fuse that was not hooked ot anything. I wounder if he had the right fuses if it would of blown.

Some people evaluate amps by how much fuses they have. They have learned at school that max power = 12V x amp fuses. So putting in more and bigger fuses gives you more power.
I've seen amps with metal lumps inside to make them heavier and thus seem solidly built.

Powa acoustic LT980/2: 560W RMS, 980W max, M'kay

that equation of amp current and voltage works as long as the amp is maxing out its current rating and performing at 100% effeciency. I have seen some cheap amps with big fuses in them as well to throw it off. Honestly you can normally tell just by the weight of the amp. Cheap shit is light, too light generally speaking...

its sad they own ppi and soundstream now

I pray P-Acou doesnt own Soundstream that has to be a lie.

Eric D wrote:he had 25A ones in all of them.

the bass boost, gain, and all other controls were all the way up.

You don't get it Eric, these are mods for MORE POWER. How else will you get all the watts?

stipud wrote:

Eric D wrote:he had 25A ones in all of them.

the bass boost, gain, and all other controls were all the way up.

You don't get it Eric, these are mods for MORE POWER. How else will you get all the watts?

Easy, you chrome the som'bitch.

I had/still have the "Kole Audio" version of that amp, Q2-980.
Ran a 12" Shiva...great amp for my high school years, couldn't beat it for $80.