Could this plate amp really do 400W RMS??

[sm31]

I'm replacing a blown cap on a plate amp that I got (for free) off an "Acoustic Audio HD-sub12" subwoofer. I'm no electronics wiz, but I can read the side of a capacitor and I can solder...

The vendor claims 400W RMS and 800W peak. The amp does perform reasonably I suppose, but I don't really have anything to compare it to.

While replacing the capacitor, I decided to research the chip. The code on it is TDA7264 (datasheets are all over the net). To me it looks like this chip can't go over 50W RMS (@ 8 ohms), but I really don't know what I'm looking at. And I don't know whether the sub vendors claim is for 8 ohms or 4 (but I think it's 4).

Also, I've heard that the narrower bandwidth (20 - 240 hz or so) increases the power rating for an amplifier. But again, I have no idea how that works or whether it's a true statement.

Can you guys help an ignorant noob and see whether this amp can perform as claimed? Thanks!!

By the way... I posted the same question at Hometheatershack, but haven't received a reply yet. I don't like double posting, but I figured this one may be tough to answer.

 

[sm31]

Hmm... Looks like this may be the wrong place....

Anyone have a suggestion as to where I could find some answers concerning the TDA7264 chip? I found a few sites that discuss the technical aspects of it, but they're way over my head.

My hope is that, when integrated into a sub amp this thing can churn out well in excess of 50 watts RMS . I'm planning to build a little box to stick it in, but I don't want to go to the effort if it's weaksauce.

 

[GranteedEV]

That chip sounds like some sort of early stage opamp or something. You're probably not looking at the right amplifier module.

 

[sm31]

Thanks! That is entirely possible... I'll do some more checking.

 

[audiofox]

The output is probably a discrete transistor or FET (probably one or more per channel) and would most likely be mounted to a heat sink and be close to the end of the audio signal path-that might help you locate it. Good luck