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#162374 - 03/22/07 09:15 PM Emotiva MPS-1 shutting down? Amp gurus help
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13325
Loc: Iowa
Hello everyone,

Before I call Lonnie at Emotiva tomorrow, I thought I'd get some feedback from other big dog owners.

I've had my mps-1 chassis with 2 epm300 mono's for a few months now and have been very happy. I am driving new Axiom m80v2's (stable 4 ohm) which should not be a problem for the mps-1. I am also using my Denon 2805 as a prepro to the mps-1.

Tonight while my wife was gone I had things cranked up pretty loud, reading about 100-106dB's on the SPL meter from 13ft away. I was listening to a little Doobie Brothers Greatest hits and slowly pushed the Denon volume knob to 0, then + 5, then +10.....then.....+13dB (which was max for the Denon with the left/right calibrated at +5dB to achieve 75dB SPL). Anyway, the MPS-1 went into shutdown mode and I could hear the fans running.

I then turned it back on and was playing the Beatles LOVE CD at around +5dB on the Denon master volume, first the left amp shut down, shortly followed by the right amp on the mps-1. Basically, the blue lights turn off.

So what is going on? I've heard the Axiom m80's will shut down some AVR's, but the mps-1 is stable to 2ohms according to the manual. Is it my Denon? I figured that being a prepro, it is just passing the signal to the mps-1 to amp, so there should be no strain on the Denon?

I read the review by Gene at Audioholics, talking about pushing this mps-1 to unbelievable limits with no problems. Any input would be appreciated.

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

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#162375 - 03/22/07 09:35 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6720
Loc: The Peoples Republic of Il.
Randy, it seems you were just pushing the amps beyond what they can handle. I don't think it gets any more complicated than that.
_________________________
Rick


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


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#162376 - 03/22/07 09:41 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Wid]
CosmicVoyager Offline
aficionado

Registered: 02/01/04
Posts: 789
Loc: Asheville, NC
I agree. I never have had any issues with my M80's shutting down any of my amps. Do you have good ventilation?
_________________________
M80's VP150 QS8's Earthquake SuperNova MKV-15
Integra DTR-7.4 Outlaw 755 Outlaw M200's Outlaw ICBM

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#162377 - 03/22/07 09:49 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10379
Randy, this is very basic, but there may be a possible loose strand somewhere in your wiring that vibrated into a short at very high sound levels. Re-do your wiring just in case. There appeared to never be a problem with the 2805 alone, and no, it has nothing to do with this when it serves as a pre-pro.
_________________________
-----------------------------------

Enjoy the music, not the equipment.



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#162378 - 03/22/07 10:11 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: JohnK]
Spoiler Offline
aficionado

Registered: 01/03/06
Posts: 680
Loc: South Florida
A guess on my part, but Sirquack didn't run the 2805 with the M80's alone, just the M60's, correct?

Wow.. and I thought I was cranking my system to insane levels! My M80's are calibrated to +7db to achieve 75db SPL on the 3805, and being driven by the Outlaw monos. I had them set to large and cranked the volume knob to +7... it scared me to hear an extra "popping" from the M80 woofers... they were being overdriven!! Needless to say, I'm back to the 60hz crossover. The Outlaws, though toasty to the touch, never tripped. (This was after about 45 min. pounding them) On the other hand, I haven't cranked the Denon to full volume, though +7 is close. Keep us updated!


_________________________
Epic 80 / SVS PB13 Ultra
Denon 3805 / M2200 Outlaw Monos /
Sammy 55" LED

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#162379 - 03/22/07 11:11 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Spoiler]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13325
Loc: Iowa
Thanks guys. Based on Gene's review at audioholics, he ran the MPS-1 at 120+ dB's for hours at a party he had for his columbian friends, and the MPS-1 didn't make a sweat. I really can't believe I'm overdriving it Rick?

The amp is in the lowest shelf of my AV rack with plenty of breathing room on top and back. The basement stays pretty cool year around.

I will recheck the wiring, but find that hard to believe as I'm very picky on my connections, but one should never assume.

Normally, I don't play music this loud, somewhere in the 90's is more than fine. With the efficiency of the 80's, it does not take much.

Also, keep in mind my room is 8100 Cubic Feet, so I have a lot of air to fill. From the primary movie seat I was fluctuating from 98-105 or so dB's during different passages of the music when having it really cranked up.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#162380 - 03/23/07 08:56 AM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6720
Loc: The Peoples Republic of Il.
What was the size room that Gene had the amps in? As you noted you do have a very large room to fill. I would be a bit disappointed in the amps if that's all they can muster. My Rotel can put out 105 to 110 db for quite some time and not go into over load. Then again it's not being done in a 8100 cubic ft room.
_________________________
Rick


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


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#162381 - 03/23/07 10:51 AM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Wid]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13325
Loc: Iowa
I believe Gene was having a party outside.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

Top
#162382 - 03/23/07 11:03 AM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 10856
Loc: Central NH
Quote:

outside



THAT qualifies as a big room, I think!
_________________________
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

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#162383 - 03/23/07 11:28 AM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: MarkSJohnson]
Hutzal Offline
connoisseur

Registered: 07/26/06
Posts: 2102
Loc: Hollywood. (Canadian @ <3)
Randy,

To eliminate all the problems that may be associated with it. Why not try to take the amp out of the rack and in some open space (if your RCA cables are long enough). See if that makes a difference in the shut down. If it does, then you know it has to do with air circulation.
_________________________
Producer | Composer
www.robbhutzal.com

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