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#162614 - 04/14/07 10:23 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
PeterChenoweth Offline
connoisseur

Registered: 10/23/03
Posts: 1349
Loc: Jacksonville, IL
Awesome that the bi-amping helped a bit. Are you running the M80's full range?
_________________________
M80v2 | VP150v2 | QS8v2
SVS Pci+ 20-39
Emotiva UMC-1 & LPA-1
M22ti + T-Amp, in the Office

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#162615 - 04/14/07 10:34 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6716
Loc: The Peoples Republic of Il.
Earlier in the thread you said.

Quote:

Even when I walked up to about 3 ft of either m80, was not even hitting 110dB's, at least what I could see visually with the SPL meter.





This is from today and the bi amping trial. So what exacty changed?



Quote:

When the woofer section shut down, I was not going over 110dB from 3ft in front of the speaker.







Edited by wid (04/14/07 10:59 PM)
_________________________
Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#162616 - 04/14/07 10:47 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: bridgman]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10304
Well John, the reason that the amp driving the mids/highs didn't shut down is likely the result of two factors: the impedance of the M80s in those frequencies varies from about 4-15 ohms, with an average of about 8-9, so that made things easier; in addition, it's likely that the highest power demand on that particular material occurred in the bass range, so that amp had to handle very little of it.

As to the bass section amp, no, there isn't any difference in the impedance it faced(and current required)before and after; from the published graph it's very close to the nominal 4 ohms, and nothing's been changed, since the bass drivers are of course the same and the crossover circuitry hasn't been changed either.

As to the observed higher setting before shutdown in the bass, there shouldn't be any significant difference if the conditions were identical, since no additional power capacity has been added. The temperature and/or current limiting circuit should shut it off at about the same setting. Possibly there had been longer operation and the temperature was higher when it had shut down at +4 on the previous occasion.
_________________________
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#162617 - 04/14/07 11:22 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: PeterChenoweth]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13309
Loc: Iowa
Thanks Peter, now that you ask that question. In previous tests I had the 80's set to small, with a crossover of 80hz. So the MPS1 amps weren't even getting the entire low freq's.

Today, I actually set the 80's to large, with No Sub turned on. The bass was very nice and tight and full of punch, that is until it shut down.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#162618 - 04/14/07 11:44 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
duckman Offline
devotee

Registered: 01/09/03
Posts: 312
Loc: kansas
This would solve your problem. They used to make a 2ch version that was like 600x2 at 8 ohms.
_________________________
Just say No to HDMI

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#162619 - 04/15/07 12:41 AM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5256
Loc: Bowmanville, Ontario, Canada
>>In previous tests I had the 80's set to small, with a crossover of 80hz. So the MPS1 amps weren't even getting the entire low freq's. Today, I actually set the 80's to large, with No Sub turned on.

Auggh !!

What happens if you run with the mains set to Small ? Would that be more of an apples-to-apples comparison ?

There's no smiley for this, but imagine me asking the next question through clenched teeth. IS THERE ANY CHANCE THAT THE BETTER SOUND AND TIGHTER BASS MIGHT HAVE SOMETHING TO DO WITH THE DIFFERENT CROSSOVER SETUP AND NOT THE BI-AMPING ?


Edited by bridgman (04/15/07 12:44 AM)

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#162620 - 04/15/07 01:02 AM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: bridgman]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13309
Loc: Iowa
This will do the trick. huh Rick


_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#162621 - 04/15/07 06:56 AM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6716
Loc: The Peoples Republic of Il.

I bet it would
_________________________
Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#162622 - 04/15/07 08:04 AM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Wid]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13309
Loc: Iowa
I wonder if their warranties are transferable, this one is on Audiogon?
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

Top
#162623 - 04/15/07 08:23 AM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6716
Loc: The Peoples Republic of Il.

No they are not.
_________________________
Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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