Possible faulty amplifier channel

[wew lad 5,000+ posts]

I have a PAD40004 that seems to constantly blow the speaker I put on the FR channel. I've used two different speakers, both went bad (still not sure if I got unlucky manufacturer defect speakers or not, hoping this rules that out or in).

Anyways, what's the best way to check this amplifier? I've been trying to get in contact with someone with an oscilloscope, but I've had no luck. Testing the AC/DC voltage with my DMM doesn't show anything off, but I do read DC voltage (this DMM is known to be innaccurate so take that bit of information with a grain of salt). The AC voltage is correct when using a 1khz sine wave at 0db

If someone is in the Volusia county area (daytona beach) or greater orlando with a SMD DD-1 or oscilloscope or just has the knowledge to test a faulty amplifier I would be happy to make up for your time with a case of beer!

Click to read more...

 

[wew lad 5,000+ posts]

I spoke with polk audio and he said that it is likely a problem with the amplifier internal grounding that's causing the speakers to fail.

Any truth in this? I'm not well versed on the internals of amplifiers. He said I can send the amplifier to them and theyll send me a new one in about 10-14 days

 

[Jeffdachef 5,000+ posts]

i'd RMA it. If you want, you can use a DMM to test for shorts but it would require you to open up the amp and possibly void the warranty, so its safer to just send it in and get a new one.

 

[wew lad 5,000+ posts]

RMA? Return something authorization? sorry I'm kinda lost on that acronym lol. They dont have RA's though, I just have to send the amp in with my original receipt and address, according to polk. Might call the warranty center just to be sure

I wish I could go in the amp and check the circuitry, but that'd for sure void the warranty and I don't trust myself to not accidentally short something because I'm a noob when it comes to amplifier internals. I've only taken one digital circuit design class and it's more for flip flops and multiplexers, not for actual diagnostics of circuits.

based on your response, it's safe to assume that it's possible this is something that could happen? itd be nice to finally have an answer to this **** clusterf***