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#162554 - 04/05/07 03:23 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: MarkSJohnson]
Mojo Offline
connoisseur

Registered: 01/21/07
Posts: 3430
Randy,

A couple of things:

1. I'd ask Emo to comment on the distortion. See what they have to say.

2. How did the songs sound to you at increased power levels?

Also, it is more difficult for an amp to amplify lows than highs (you had that backwards in your post).

I suppose Emo has been vindicated through all of this. I think you may be ready to enjoy the Emo now .

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#162555 - 04/05/07 03:26 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Mojo]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13357
Loc: Iowa
Waiting for a call back from Emo.

2) At +3 the music sounded outstanding with no hint of strain, at +4 shutdown time.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#162556 - 04/05/07 03:55 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
Mojo Offline
connoisseur

Registered: 01/21/07
Posts: 3430
Quote:

Waiting for a call back from Emo.

2) At +3 the music sounded outstanding with no hint of strain, at +4 shutdown time.




Oh boy! I didn't realize that it shut down. I can see your predicament now. You had 200W going great with 100W of headroom to spare. The problem is, you can't make use of that 100W given the resolution of your Denon's gain knob. Ouch! Maybe the speaker is closer to 3 Ohms or slightly less during your song sessions. How about turning the channel gain (not the main volume but the individual channel) up 0.5 dB. That might get you what you need.

It sounds like another great feature on the Emo would be a gain trim. This would be a control that would allow you to adjust the gain very finely.

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#162557 - 04/05/07 04:43 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13357
Loc: Iowa
Same tests using the Denon instead, side by side to MPS-1. The Denon is rated at 100watts into 8ohms.

Volume Knob, Voltage, P=Vsquared/5 60hz tone
MPS-1______________________Denon
-25 .64 .08________________-25 .71 .1
-20 1.11 .24_______________-20 1.25 .31
-15 1.99 .79_______________-15 2.23 1
-10 3.40 2.31______________-10 3.84 2.95
-5 6.08 7.39_______________-5 6.85 9.38
0 10.75 23_________________0 12.18 29.6
+2 13.48 36________________+2 15.2 46.2
+4 16.85 56.7______________+4 19 72.2
+5 18.8 70.5_______________+5 21.3 90.7 (Den 5.5 buzz)
+6 21.1 89 (Emo 6.5 buzz)__+6 23.7 112
+8 26.2 137________________+8 25 125
+10 33 218_________________+10 26.4 139
+12 36.7 269_______________+12 28.3 160
+13 38.5 296(Emo Shutdown__+13 29.6 175 (ranout of volume knob as m80's are calibrated to +5 max vol is +18)


Volume Knob, Voltage, P=Vsquared/4 100hz tone
MPS1_______________________Denon
-25 .64 .1_________________-25 .7 .1
-20 1.11 .3________________-20 1.22 .37
-15 1.99 1_________________-15 2.19 1.2
-10 3.4 2.9________________-10 3.77 3.55
-5 6.03 9.1________________-5 6.72 11.3
0 10.67 28.5_______________0 11.89 35.3
+2 13.36 44.6______________+2 14.9 55.5
+4 16.7 69.8_______________+4 18.6 86.5
+5 18.69 87.3______________+5 20 100 (5.5 Den buzz start)
+6 20.9 109.2______________+6 20.8 108
+8 26.2 171.6______________+8 22.2 123
+10 33 272_________________+10 23.4 136.8
+12 36.7 336(Emo Buzz)_____+12 26.3 173
+13 40 400 (amp shutdown)__+13 27.6 190


Volume Knob, Voltage, P=Vsquared/4 Music
MPS-1______________________Denon
-20 2 1____________________-20 2 1
-15 3.3 2.7________________-15 4 4
-10 6.1 9.3________________-10 6.7 11.2
-5 13.3 44.2_______________-5 13 42
0 19.8 98__________________0 20.8 108
+2 24.5 150________________+2 26 169
+3 28.8 207________________+3 29.6 219
+4 40 400 (shutdown)_______+4 36 324
___________________________+6 44 484 ( I could have kept going but didn't


Edited by sirquack (04/05/07 04:53 PM)

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#162558 - 04/05/07 04:50 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
Mojo Offline
connoisseur

Registered: 01/21/07
Posts: 3430
Really? The Denon was going over 300W with music? What did it sound like?

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#162559 - 04/05/07 04:55 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Mojo]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13357
Loc: Iowa
I was off to the side monitoring the meter and volume control so could not get the same experience as in the main seat. I could tell it was a little strained and not as detailed, maybe you could describe it as a little harsh. But no signs of shutting down.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#162560 - 04/05/07 05:23 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
Mojo Offline
connoisseur

Registered: 01/21/07
Posts: 3430
At those kinds of levels, I wonder at what point the Denon would shut down due to over-heating. Maybe you don't need another amp then...maybe the Denon is just fine.

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#162561 - 04/05/07 07:25 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Mojo]
Haoleb Offline
connoisseur

Registered: 09/25/02
Posts: 1488
Loc: Maine
After reading your test results I decided to try out my new true rms fluke DMM, Its got a min/max record feature and i couldnt find my test tones so i just cranked some music. I only got to 30v before i felt i had enough. I would never listen to music that loud simply because its no longer enjoyable. I'm not sure I wouldnt want to play music at that level for hours on end because I doubt that my amps can dissipate the heat fast enough without the help of fans.

Class A/AB amps generate a little more heat than these Class H types
_________________________
Haoleb's Audio/DIY Website

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#162562 - 04/05/07 07:31 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6754
Loc: The Peoples Republic of Il.
So are you saying your Denon was putting out 484 watts on music? Somehow I think this is flawed, I don't know how but damn, 484 out of a reciever.
_________________________
Rick


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


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#162563 - 04/05/07 10:01 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Wid]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13357
Loc: Iowa
Wid, not sure how to respond. Keep in mind at any given volume level the meter was fluctuating voltage numbers very quickly. I was watching the display and trying to right down the highest number I noticed.

So lets say during the heavy passages of a song, I might see voltage readings from 10-15.9 and everything inbetween. I then wrote down the highest value I viewed on the display, so the highest peak voltage at each volume selected. I wish my meter had a setting to store the highest value so you don't have to be so alert.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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