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Re: XPA 2 Now! A Keeper?
SatKartr #227299 10/28/08 03:48 PM
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I find it deeply satisfying whenever JohnK can combine theology and audio.


bibere usque ad hilaritatem
Re: XPA 2 Now! A Keeper?
tomtuttle #227309 10/28/08 04:46 PM
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::bows to audio gods::


Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!
Re: XPA 2 Now! A Keeper?
fredk #227365 10/28/08 11:13 PM
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Well I finally caved in and plugged the Axioms into the 663 and the same thing happened only this time the Yamaha shut itself off at the peak.

I knew some of the Yamahas were not a good fit with the Axiom but the plan was to use the 663 as a pre/pro only, it's interesting that the Yamaha website states that their amps are stable down to, but not below, 4 ohms. I guess it doesn't mean much with such a low end model, an Amazon user states that the the 3800 drove the m80s no problem.

So my far pre/amp gambles have not paid off, it looks like I'll have to up the ante just to experiment more.

Still have to hope there is not something wrong with my power situation that is interfering with high current audio, since this is now 2 amps that have crapped out when push comes to shove, although I suppose the second example doesn't mean much . . .


"If you try to turn toward it, you go against it."
Re: XPA 2 Now! A Keeper?
SatKartr #227369 10/28/08 11:53 PM
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Two different amps, both shutting down at high volume. Interesting. Could it be at all possible that you somehow have a defective M80 that's causing the problem?


M80v2 | VP150v2 | QS8v2
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Re: XPA 2 Now! A Keeper?
PeterChenoweth #227371 10/29/08 12:08 AM
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Do you have a friend or family member with a Denon, H/K, Rotel etc. Something that is known to drive the M80s well.


Rick


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

Re: XPA 2 Now! A Keeper?
Wid #227374 10/29/08 01:07 AM
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No we are transplants from the Northeast, all I have is a lowly 50 wpc Rotel circa 1989, which sounds good but can't be cranked up to a reference volume.


"If you try to turn toward it, you go against it."
Re: XPA 2 Now! A Keeper?
SatKartr #227385 10/29/08 01:36 AM
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Does the Rotel shut down when pushed real hard?


Rick


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

Re: XPA 2 Now! A Keeper?
SatKartr #227386 10/29/08 01:38 AM
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There was a suggestion about possibly measuring the impedance of the M80s. Impedance varies with frequency and is fairly complex to measure, so it's better to rely on the measurements made by a competent lab, if available. In this case the NRC is certainly highly competent and has done the measurements, which have been shown here. If a particular M80 was somehow not representative of the published impedance curve and was in fact far lower, it should be noted that in that case the DC resistance of that driver's voice coil would measure far less than the typical 3/4ths of the nominal value(e.g., the DC resistance of a driver nominally rated at 4 ohms might typically measure 3 ohms or a bit more). The actual impedance to AC audio signals would be the DC resistance plus some additional impedance caused by reactance at various frequencies. So, if the DC resistance measured across the terminals is say at least 3 ohms, then the impedance at various frequencies will always be higher than that, and if the concern is the minimum impedance, the question has been answered.


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Enjoy the music, not the equipment.


Re: XPA 2 Now! A Keeper?
Wid #227391 10/29/08 01:48 AM
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I guess I haven't wanted to press my luck and possibly damage the speakers? I would have to turn it all the way up and go into distortion, and I would be surprised if it would shut down, I've had it up around 3/4 and it doesn't seem stressed.


"If you try to turn toward it, you go against it."
Re: XPA 2 Now! A Keeper?
JohnK #227392 10/29/08 01:49 AM
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Maybe it's time to cart the M80s with you down to Austin? If so, my Denon 3808 stands at the ready to test them. \:\)

Jason


Epic 80-800: HG Cherry
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