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#162494 - 04/03/07 04:02 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Mojo]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13331
Loc: Iowa
Thanks everyone for their input, I'm very confused getting feedback from both sides. I just wish you guys could do the talking for me.

I think I'll hit a bar on the way home and have a few Guinness beers and ponder what to do next, arggg. Maybe I'll send it back and get one of the new Denon's with MultEQ from Odyssey.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#162495 - 04/03/07 04:44 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
michael_d Offline
connoisseur

Registered: 07/23/04
Posts: 3903
Loc: Up yonder
Quote:



They are NOT defective, whatever you think. It has all been explained above. Any amp WILL clip if driven past its limits, I don't care if you have a Rotel or whatever. You say yours did not clip, what facts or equipment do you have to back that statement.





That you asked that question in the pissy-assed tone you used, and actually think a person needs complicated testing equipment to prove clipping is occurring is enough to demonstrate that there is nothing I can do or say to you to explain the obvious to you.

And what really bugs me about your response is that you seamed to forget that YOU posted the question asking for advise, and that YOU posted the problems your are experiencing, and YOU are the one who continues to negate anything that anyone else has posted that does not coincide with what you want to hear. > there is nothing wrong.

I am doing nothing but trying to help you out and possibly anyone else gullible enough to believe that nothing is wrong here. I will not do that again, at least not for you.

I should have learned my lesson trying to make you aware of a potential unsafe grounding situation in your home. – that you chose to ignore as well.
_________________________


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#162496 - 04/03/07 05:03 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: michael_d]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13331
Loc: Iowa
For starters, your advice is why I had 2 electricians from two companies come out and check our house. They both said there was nothing wrong with the electrical box or ground in my home. It is to code. The problem was resolved by Emotiva by placing a cap on the regulators that operate in the ghz frequencies.

I live close to an airport and the signal tower operates in the microwave frequencies, which was interfering with the amps, they made it right again, and the ground was not to blame.

Your still not providing any facts as to why you think the amps are defective, versus just being pushed to their design limit. 119dB's at 1 watt 1 meter requires 256 watts. If the $49 Radio Shack meter is not as accurate as the Audio Toolbox meter, which I think most would agree, then peaks of 20dB's would refer to ranges beyond 300 RMS, in which the amps protective circuitry would be introduced.

I just need to decide if I can live knowing the amp will shut down if pushed to +4 on the volume knob, or look for something else.

I am not the only one having this problem, if you follow other forums. Otherwise, I would say yes I have a defective amp. Other people with 4ohm speakers from Onix, NHT, and Axiom are having the same issues when pushed to similar levels.

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

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#162497 - 04/03/07 05:19 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
Lorenzo1000 Offline
aficionado

Registered: 02/07/04
Posts: 537
Loc: Winterpeg
Randy I am not going to tell you that the amps are defective. To be honest I don't know one way or the other if they are defective or not. The one thing I can tell you is that they do not meet your needs or expectations. That alone should be enough that you would send them back and seek out other products that may be better suited to your listening environment. I think that your Denon is one of the best HDMI receivers out there at the moment so I don't think you need to replace that unless you need more HDMI inputs.

It would be nice if you lived closer so I could lend you my ATI amps to try out to see if there was any difference. Good luck with your decision.
_________________________
2xM80 VP180 2xQS8 2xM3 HSU STF3 LG 60PS11 Denon 3808 ATI 1506 LCR 2xATI 1502 Oppo BDP-83

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#162498 - 04/03/07 05:28 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Lorenzo1000]
Hutzal Offline
connoisseur

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

The one thing I can tell you is that they do not meet your needs or expectations. That alone should be enough that you would send them back and seek out other products that may be better suited to your listening environment.




well said.
_________________________
Producer | Composer
www.robbhutzal.com

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#162499 - 04/03/07 06:17 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Lorenzo1000]
Lorenzo1000 Offline
aficionado

Registered: 02/07/04
Posts: 537
Loc: Winterpeg
Well apparently I'm none too bright as all along I thought Randy was using the Denon 2807 which has HDMI when he actually has the 2805. Still shouldn't make any difference amplifier wise though.

Thanks for pointing out my faux pas Randy and good luck with whatever you decide to do.
_________________________
2xM80 VP180 2xQS8 2xM3 HSU STF3 LG 60PS11 Denon 3808 ATI 1506 LCR 2xATI 1502 Oppo BDP-83

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#162500 - 04/03/07 07:30 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Hutzal]
bugbitten Offline
connoisseur

Registered: 04/06/05
Posts: 2339
Loc: Madisonville, KY
Quote:

Quote:

The one thing I can tell you is that they do not meet your needs or expectations. That alone should be enough that you would send them back and seek out other products that may be better suited to your listening environment.




well said.




Send it back. Try something else with big toroids like the Outlaw 7500 (2 toroids). See if it meets your needs. You can always go back.

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#162501 - 04/03/07 07:35 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: bugbitten]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6720
Loc: The Peoples Republic of Il.

That's one thing the Rotel RB 1080 has, it has a 1.2 KVA transformer.
_________________________
Rick


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


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#162502 - 04/03/07 07:44 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: bugbitten]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13331
Loc: Iowa
How large are the toroids in the Outlaws spread across 5 or 7 channels? I know each amp on the mps-1 has its own 350VA Toroid or 2.45KVA total for 7 amps.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#162503 - 04/03/07 07:49 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
Mojo Offline
connoisseur

Registered: 01/21/07
Posts: 3292
Quote:

...which I think most would agree, then peaks of 20dB's would refer to ranges beyond 300 RMS, in which the amps protective circuitry would be introduced.




By protective ciruitry, I am assuming you mean a shut-down circuit. Since EMO is using a waveform limiter, a shut-down circuit should not be necessary. The limiter should attenuate the gain of the amp...not shut it down. Otherwise, what exactly is the point of the limiter?

Quote:

Other people with 4ohm speakers from Onix, NHT, and Axiom are having the same issues when pushed to similar levels.




I am starting to wonder if the resistors EMO used to simulate speakers during power testing changed value as they were being heated. The devil's in the details.

I find statements such as these on the EMO site worthy of further inquiry. I very much doubt EMO is achieving 0.015% THD into 4 and 2 Ohms:

&#8226; THD less than .015%, 20Hz-20kHz with 80kHz measurement bandwidth
&#8226; 200 watts/8 ohms &#8211; 300 watts/4 ohms &#8211; 400 watts/2 ohms - seven channels driven, mains limited
&#8226; Frequency response 20Hz-20kHz +/- 0.1 dB, or 10Hz-125Khz +/- 3dB

A spec written like this would certainly be less confusing (some of my numbers are made up): Frequency response 20 Hz to 20 KHz +/- 0.1 dB with 0.15% THD for 200W into 8 Ohms, 1% THD for 300W into 4 Ohms, 5% THD for 400W into 2 Ohms.

Having said all of this, for the price, I would certainly be happy with one of these amps .

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