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#162504 - 04/03/07 07:53 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
bugbitten Offline
connoisseur

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

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.




I'll have to find the size (I bet Gonk knows), but the 7500 and 7700 have the same 2 toroids. Must be big for the 7500 to weigh 80 lbs.

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#162505 - 04/03/07 07:54 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Wid]
Mojo Offline
connoisseur

Registered: 01/21/07
Posts: 3292
I think that's pretty similar to the MPS-1. The MPS-1 toroid looks like 600-700 VA and drives a single channel. The Rotel drives two channels.

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#162506 - 04/03/07 08:00 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
Mojo Offline
connoisseur

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

I know each amp on the mps-1 has its own 350VA
Toroid or 2.45KVA total for 7 amps.




Are you sure it's only 350VA? It looks a lot bigger than that. If so, how is it that they are doing 780W RMS? The toroid would burn like my quiche in grade 7 cooking class.

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#162507 - 04/03/07 08:40 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: Mojo]
bugbitten Offline
connoisseur

Registered: 04/06/05
Posts: 2339
Loc: Madisonville, KY
350VA is correct for the MPS.

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#162508 - 04/03/07 10:18 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10363
Randy, one of your questions involved possibly disabling the anti-clipping limiter circuit, but as Mojo also pointed out this circuit doesn't cause the amp to shut down, it just lowers the gain. The result is that at extreme levels a lower, more rounded wave top results instead of a clipped flat top. So, that circuit isn't guilty with respect to the shutting down.
_________________________
-----------------------------------

Enjoy the music, not the equipment.



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#162509 - 04/03/07 10:39 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: JohnK]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13318
Loc: Iowa
Ok, John, Mojo, and whoever wants to provide input, here goes.

I dug out my old digital multimeter. About 15 years ago I took an electronics class through the NRI schools. About all I can remember is watts = volts x amps, if I recall correctly.

So, how about I hook up the multimeter between the speaker terminals on the amp, and the 12AWG wire going to my m80's. Then watch the current (amp) readings as I slowly turn up the volume while listening to music. If I make note of the reading at the time the amps shut down, could I not figure out the watts, and see if I truely am even close to 300 watts?

I just want to be in the ballpark, so when I call Emotiva I've got a little evidence, other than the Radio Shack SPL readings.

Thanks, Randy


Edited by sirquack (04/03/07 10:46 PM)
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#162510 - 04/03/07 11:04 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10363
Yes, do it, but you'll be reading voltage(which is the boss), not current. Then the form of Ohm's Law which is applicable would be P=Vsquared/R.
_________________________
-----------------------------------

Enjoy the music, not the equipment.



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#162511 - 04/03/07 11:08 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: JohnK]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13318
Loc: Iowa
Ok, I'm confused, isn't it current that would be traveling through the speaker wires? And, voltage is what would be in the AC line?

Easy on me John.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

Top
#162512 - 04/03/07 11:15 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: SirQuack]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10363
Randy, the actual power is being carried by way of an electromagnetic wave traveling along the outside(not inside)of the speaker wire. Don't worry about current at this point; the standard way of measuring what you want to learn is by way of taking the voltage across the output terminals at varying levels.
_________________________
-----------------------------------

Enjoy the music, not the equipment.



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#162513 - 04/03/07 11:17 PM Re: Emotiva MPS-1 shutting down? Amp gurus help [Re: JohnK]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13318
Loc: Iowa
ok, I'm going to run down and give it a quick try...thanks a bunch
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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