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Re: The M80's just got here....the AMP will not work
ClubNeon #346707 04/30/11 12:52 PM
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if you'd want to test with 8 Ohm load, connect both M80s in series on one channel and then test again by connecting on the other channel.
2 x 4 Ohm speakers in series will make 8 Ohms.

Re: The M80's just got here....the AMP will not work
J. B. #346709 04/30/11 01:28 PM
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Can you clarify the conditions in which the amp is shutting down.

I am under the impression that you turn up the dial to a certain point and the amp shuts down. In which case like what a few people experience in the past sounds like exposed wire being damaged by an animal, vacuum (cleaning lady) etc or something going on like a whisker at the connection point. Since you are using banana plugs, check the banana plugs on the onkyo and at the speaker terminals that they are not touching either. This can cause the amp to shut down. The Polk terminals might have a bit more space for the plugs than the Axioms.

If there is a short inside the speaker itself then the amp would react the same way.







I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne
Re: The M80's just got here....the AMP will not work
BlueJays1 #346714 04/30/11 03:33 PM
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Tom's idea of trying the speakers one at a time is very valid. There may be a problem with one of the speakers, and that test would root it out. Also, trying them at low levels is another good idea. If the amp trips at low levels there is most defintiely a short somewhere.


LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7
Re: The M80's just got here....the AMP will not work
J. B. #346716 04/30/11 04:36 PM
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Originally Posted By: J. Bellemare
if you'd want to test with 8 Ohm load, connect both M80s in series

If you don't know how to do this the wiring goes:

+ from the amp to + in speaker 1
- out speaker 1 to + in speaker 2
- out speaker 2 to - to the amp


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Re: The M80's just got here....the AMP will not work
bobt #346728 04/30/11 06:51 PM
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Hello bobt,

Sorry you're having problems with your M80s and the Onkyo power amp. Like 2x6spds, I believe the old Onkyo M-series of power amps are very robust and it shouldn't have any problems with a 4-ohm load like the M80s. By the way, there were lots of 4-ohm high-end speakers back in the 1980s, including models from Acoustic Research, Infinity (the Kappa series), B&W, Acoustat, Axiom, Apogee, Duntech, JBL, Linn, Boston Acoustics, Dahlquist, Altec and so on.

Back then, at the AV magazine in Canada that I edited (Sound Canada, then Sound&Vision), we tested a fair number of big power amps, including several Onkyos, some Yamahas (M1000, M800), Perraux, Bryston, Macintosh, and others from SAE,. In fact, in that time, lots of stereo receivers would drive 4-ohm loads with no problems because there were just two internal amplifiers to heat sink and keep cool (not seven!).

Although I never owned an M-series Onkyo power amp, I always admired them and recommended them. I owned several Yamaha power amps with big-ass power output meters, one of which continues to power the M80s on my switching system. It has never shut down, nor has the the mid-level H/K AV receiver I have on the M80s. At the Axiom plant, we have an entry-level ($300) Sherwood Newcastle stereo receiver that drives the M80s to extremely loud levels and has never shut down.

2x6's note about the 504 having protection circuitry that may shut it down with large current flow makes me apprehensive, but still, like others here I think there must be a short or a stray wire in the connections or perhaps a defective driver in the M80s (it's rare, but it happens).

It's only in the last decade that some Onkyo receivers had real problems with ultra-sensitive protection circuitry and the 4-ohm M80. Recent higher-end Onkyos seem to be much more stable.

The M-504 in the mid 1980s was expensive in Canada--$1500--and it's mystifying to me that it's having shut-down problems.

Regards,
Alan

Re: The M80's just got here....the AMP will not work
alan #346747 04/30/11 08:52 PM
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Despite Bob insisting that his wiring is fine, the first thing I would have done is remove the wires and banana plugs and do it all from the get-go. Then verify the speakers by using them one at a time. If one fails, switch it to the other channel to see if the problem remains with the speaker or the amp channel.

For all the posts in this thread, I don't see evidence that Bob has ruled out these basic possibilities.


::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::
Re: The M80's just got here....the AMP will not work
MarkSJohnson #346775 05/01/11 01:46 PM
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OK guys, sorry i wasn't around yesterday, did not have time to do any other tests. Just a note, the speakers will play at lower volumes, only when you turn it up dose the amp shut down.( so i "ASSUME") the M80's just drop too low, ohm wise then this amp wants to see.

I will go thru all the connections again..double check everything. The first thing i will do is connect the old large Advents up, and run them at volume. Just to make sure i didn't damage the amp.
By the way, dose anybody run QSC, or Crown amps to power the M80?
Altho not really considered "Stereophile" amps, they do put out the power and can drop to 2 ohm's without a problem. I could get one of those shipped to the house in a few days. If one of those amps shuts down...then it's for sure a problem with the speakers. Those amps i can just send back, no questions asked.

Re: The M80's just got here....the AMP will not work
bobt #346778 05/01/11 01:58 PM
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I still don't get why you don't want to run these simple tests suggested in order to rule out or confirm a defect with the M80s before investing money on another amp. But hey, whatever floats your boat!


Bruno
M80s/VP180/QS8s/EP600/AVR-890
------------------------------------
"The problem is choice..."
Re: The M80's just got here....the AMP will not work
bdpf #346786 05/01/11 02:55 PM
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If he can run the M80s at lower volume and the Advents balls out then I would bet the amp just doesn't like the presented load of the M80s. It sure wouldn't be the first amp that shut down trying to run these speakers.


Rick


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

Re: The M80's just got here....the AMP will not work
bdpf #346787 05/01/11 02:57 PM
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Pro amps from Crown, QSC, Behringer, Yamaha etc will be stable with low impedance speakers and you will also have an abundance of power at your disposal as well.

But before you get a new amp, do make sure there is no short in the chain somewhere - either the speaker or cabling because if there is your next amp will have similar fate and try to protect itself and shut down if it senses a short.


I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne
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