Originally Posted by mdaudioguy
Yes, it will be interesting to hear what people think of their MFWs with new amps. I'm especially interested to hear from those who have an older model that also pick up a newer "fixed" model. I've been considering adding a second one and would hope (or expect) that the performance would be identical to earlier models. It is also interesting to hear, however, that future models might
not be using the same driver (as suggested by craigsub), although I was unclear how he was in a position to know that.
That's a good question about the driver. The current Eminence driver is a great one. And, we all have to admit, a Mark Seaton designed sub isn't something you take lightly.
Amp issues aside (which I know is hard to do), I would be curious how the "new" amps affect performance, if at all.
There's a person over at "tweakcity" (Lance) who actually took apart the amp. He qualified his findings by stating he wasn't familiar with Class D. I'm not an EE, so much of what he said went over my head.
But, taking a look at some of the wire winds on some components (inductors), were sloppy and their coating literally "flaked off, it tracks with what MLS mentioned. That is, the amp supplier started using some inferior/not-to-spec parts. As a result, he also said that the inductors "oversaturated", putting an extreme load on the FETs. Again, confirming what MLS said about the "bad parts".
I'll say that's at least part of the reason that some of the amps seemed to get "hot", too. Would a bigger heat sink avoided the problem? Again, I'm not an EE, so I don't know. That said, my amp barely gets warm to the touch....even after a hard workout.
I'm going to make an assumption and a couple of questions. If the inductors seem to be the culprit, as has been reported, why not just rework the current amp with new inductors?
That's probably a lot of manual labor and may not be cost effective. That gets to the core of why this has taken so long to get a "fix" in place. First, AV123 doesn't know which amps have the bad components. And #2, even if you did know which ones were bad, does it make more sense to just redesign the amps, and find a better supplier?
Again, this is one guy taking apart one bad amp. And, it's another guy (me) wondering the which plan of action I WOULD TAKE.
Bottom line, seems like MLS decided to redesign the amps. And, doing that has taken a little while.