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#346643 - 04/29/11 06:42 PM Re: The M80's just got here....the AMP will not work [Re: Wid]
tomtuttle Offline
axiomite

Registered: 06/20/03
Posts: 8268
Loc: Tacoma
M60's might be an excellent choice.
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#346644 - 04/29/11 06:46 PM Re: The M80's just got here....the AMP will not work [Re: SirQuack]
bobt Offline
veteran

Registered: 02/06/11
Posts: 134
The Onkyo M-504 power amp...is a great amp. It had great reviews and works perfectly..for 20 years. The problem here is it dose not work with a 4 ohm load. Which it was never designed to do i guess. But high end stereo speakers of the time, were not 4 ohm either. Don't fault the amp. It is the best amp Onkyo ever made.
This is nothing but a power amp..hugh, weighs a ton.
Stereo hi end speakers of the time were never 4 ohms. The amp works perfect, with all the others.

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#346645 - 04/29/11 06:50 PM Re: The M80's just got here....the AMP will not work [Re: Wid]
BlueJays1 Offline
connoisseur

Registered: 09/19/08
Posts: 4070
Loc: Porch,enjoying Bombay Sapphire
Originally Posted By: Wid
Originally Posted By: sirquack
It is what it outlaw, oops, I mean is.


Or the flavor of the day.


Just a while ago, a Denon receiver would have been enough.
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#346646 - 04/29/11 06:58 PM Re: The M80's just got here....the AMP will not work [Re: BlueJays1]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17742
Loc: NoVA
I run M80s at reasonable volumes off a 75 WPC Harman/Kardon receiver. I think there's something else going on here--either a problem with the speakers or a short in the wiring.
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#346647 - 04/29/11 07:01 PM Re: The M80's just got here....the AMP will not work [Re: Ken.C]
terzaghi Offline
connoisseur

Registered: 04/04/07
Posts: 4842
Loc: Tulsa, Oklahoma
I thought you only needed 2 WPC!

Speaking of Outlaw, this looks interesting:
http://www.outlawaudio.com/products/7900.html

An amp that requires dual 15A breakers is quite a beast...
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#346648 - 04/29/11 07:01 PM Re: The M80's just got here....the AMP will not work [Re: BlueJays1]
Wid Offline
axiomite

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

I know of one speaker from the past that has always been 4 ohm, Magnepan. I doubt it was unheard of.
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#346649 - 04/29/11 07:01 PM Re: The M80's just got here....the AMP will not work [Re: Wid]
grunt Offline
connoisseur

Registered: 12/04/06
Posts: 3569
Loc: Nirvana
Originally Posted By: Wid

I don't know why anyone is surprised by an Onkyo shutting down with the M80s. Ether buy a different amp or get the M60s. I know it has to suck but it is what it is.


That was exactly my thought as I read this. AFAIR when I first started reading this forum several years ago only new Onkyo’s were being recommended for the M80s as previous models were not cutting it. That was exactly why I torture tested mine when I bought it just to make sure it could handle the 4 ohm load.
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#346651 - 04/29/11 07:03 PM Re: The M80's just got here....the AMP will not work [Re: Ken.C]
BlueJays1 Offline
connoisseur

Registered: 09/19/08
Posts: 4070
Loc: Porch,enjoying Bombay Sapphire
Originally Posted By: Ken.C
I run M80s at reasonable volumes off a 75 WPC Harman/Kardon receiver. I think there's something else going on here--either a problem with the speakers or a short in the wiring.


I agree.
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#346652 - 04/29/11 07:03 PM Re: The M80's just got here....the AMP will not work [Re: Ken.C]
2x6spds Offline
connoisseur

Registered: 03/16/02
Posts: 2726
Loc: CA, USA
Ken.C. is right.

I use an Onkyo Integra M-504 to drive a pair of Thiel CS 3.6 towers. They are 4 ohm rated speakers and reportedly a difficult load to drive. The Big ONK has no problem whatsoever driving the Thiels to high volumes with no discernable distortion and no problems, all day long.

There were many 4 ohm speakers available in the 80's, including Dahlquists, and KEFs - I'm sure there were more, but those are 2 that come right to mind.

Something is wrong with your speakers, cabling, or your M504.

Good luck.

PS

I just pulled out the manual for the M-504. They are rated at 165 wpc at 8 ohms at 1KHz, 0.003% distortion. They do not give an output rating at 4 ohms.

Worse, the manual indicates that the fault protection circuit may initiate when excessive current appears at the terminals as when speakers of lower impedence are being used.

Looks like I am lucky with mine and the Thiels.

I also have a bunch of old Yamaha M80 amps. They are rated stable to 2 ohms.




Edited by 2x6spds (04/29/11 07:23 PM)
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#346653 - 04/29/11 07:08 PM Re: The M80's just got here....the AMP will not work [Re: 2x6spds]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17742
Loc: NoVA
I THOUGHT I had heard that amp name floating around before. Thanks for backing me up.
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