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These amps do not have protection relays!
If you have nice speakers, I would think hard about continuing
to use these amps without some type of protection for your speakers..
I have Infinity Epsilons, and the woofers are extremely hard to find
and very expensive. These are the ones with the servo drive..
Hope this helps
Follow Ups:
I call Shenanigans.
Hey Pass Labs, did you fire someone recently? I think he's posting all over the place.
sans means "without" in French, withoutAudio seems to be correct.
My Pass X250.5 destroyed my woofer as well, when I was't paying attention and accidentally connected my CD player to the pass instead of the pre-Amp.
My own stupid, expensive mistake, did I say stupid?
Guys on the Agon thread said the OP was responsible for the damage to his speakers. Not the amp.
The thread was removed from Agon altogether.
Yes.https://forum.audiogon.com/discussions/pass-labs-amplifier-blew-my-speakers
Edits: 05/18/16
Feedback controlled woofers are sometimes a problem for amps. It's way better in this case if the amp/feedback woofer were an integrated package.
Just thinking out loud. Most(all?) Pass amps don't employ overall feedback. And the speaker is now trying to put feedback into the amp. Could this be a problem. Can anyone who knows amps better than I do comment?
If this was a long-term setup that had been working normally, then all of a sudden something happened while the system was not operating under particular stress (extremely high volume level), then yes, it could be the amp, or other upstream components (the source component) that is at fault. But, more information is needed. Was there a loud noise generated by the speaker before it got "cooked"?
If this was something that happened immediately after some change in the setup, that would be particularly relevant information. If you changed out one amp for the Pass amp and the problem happened shortly thereafter, that would suggest that the amp IS involved in the problem. More information is needed before the Pass amp can be implicated.
Your Infinity speakers are bi-amplified, with the owner supplying both the amp feeding the top end and the amp feeding the woofer. The woofer/amp combination is servo controlled. A signal from a sensor on the woofer cone provides information to a control unit that then sends a corrected signal to the amp. It is absolutely critical that the switch on the controller which determines the phase of this signal be set correctly. If the amp inverts phase, the switch must be set to account for that. If the phase is wrong, the "corrected" output of the amp will be actually providing the diametric opposite of what is needed to correct the behavior of the woofer cone, which in turn, will cause the sensor to send back a signal calling for more correction, which will, cause the amp to send back an even stronger incorrect output. This could cause a runaway problem that could damage both the speaker and the amp. If anything, the speaker controller should identify excessive output and provide protection. There is no way for the amp to "know" that there is a problem, it is only responding to the controller's demand for more power.
Thus, one of the issues with what amounts to Negative Feedback.
Too much is never enough
...quite a response to your second post.
Operator Error.
"Cooked" the woofers, but not the tweeters?
Hmmm.
Sounds like someone had the bass (not to be confused with "base") turned WAY up, or some other stupid mistake.
Anyway, let's review: You signed up here yesterday to: 1. Advise someone on amplifier choice, and, 2. Complain about the amp you chose.
Hmmm.
Those speakers require a biamp setup. They have a servo control unit for the woofers. So it could be the servo, the amp or abuse.
ET
since he does not respond to any of the questions.
But seriously, without further comments from the OP we will never know.Yes he just joined but that doesnt make him a troll. Time will tell.
ET
thanks Abe that actually did make me laugh. I really needed that.
.
reelsmith's axiom: Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.
Hey, I figure if we're blaming them for stuff why not toss that one into the mix.
And it why I'm not popular too!
Yeah that's the good stuff.
Golly, you sound like my last boss (30 years ago). It's only been less than 24 hours. Give the guy a day to compose himself. You know, like politicians/media do.
:)
Yes, and then they ( insert politician name ) drag up that extremely tired old "he (or she) was taken out of context" BS.
fart in a room and then exit saying "hope this helps!" :)
Yeah, I suspect you're right. We're not likely to hear from him again.
Not that there's anything wrong with that.
;)
..info on the Pass amps. Same questions asked to you on Audiogon and you do not respond. I do not own a single Pass equipment. But I know their reputation. I think you are cooking up something here.
Please provide the info that inmates are asking you and clear yourself up!!
So you tested the woofers? The servo connects to the amp you use to drive the woofers and the amp for the mid tweets. Which Pass amp and does it still work?
ET
If the amp went bad then wouldn't it blow the servo amp unit and not the woofer? Basically the SAU IS your speaker protection relay.
More info please
Did the amp actually blow? That would push DC into the speakers and cook them.
Or did the Servo unit and speaker blow leaving the PAS amp still working?
It would be helpful to know which model Pass amps you used and more details on what caused the problem. Hope you are able to repair the damage without too much stress or expense.
Nt
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