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Re: Help a newbie with deciding m60s m80s
Adrian #348730 05/19/11 10:09 PM
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a music store in Montreal who has good prices, like this one:
http://www.stevesmusic.com/index.php?main_page=product_info&products_id=5223

Re: Help a newbie with deciding m60s m80s
J. B. #348894 05/21/11 03:53 AM
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Thanks for the links guys still shopping around. Gun shy on buying second hand no reason really just would rather have new.

Any information on having 2 Emotiva xpa1 running my m80s. Is that too much amp for these guys or about right???

Re: Help a newbie with deciding m60s m80s
Nitsud #348896 05/21/11 05:51 AM
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Heh. Not hardly too much on these puppies. The XPA-1s look pretty damn cool. I'm all in favor of equipment that has that many warning labels on it.


I am the Doctor, and THIS... is my SPOON!
Re: Help a newbie with deciding m60s m80s
Nitsud #348897 05/21/11 10:21 AM
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"about right" is amp power about the same as the speaker rating.

to be more specific, you could read this:
http://forum.qscaudio.com/forum/viewtopi...a52daaddd1a0da3

if you don't want any headroom above, let's say, 105 dBSPL, you just have to calculate the power you need according to whatever SPL you want.
but it's always a good thing to have some spare horsepower.

you can find a calculator here:
http://www.crownaudio.com/apps_htm/designtools/elect-pwr-req.htm
i think the calculator is calibrated for large halls and mainly outdoor events, so the results will not apply exactly to indoor needs.
Less power is required indoors than outdoors.

Last edited by J. B.; 05/21/11 10:27 AM.
Re: Help a newbie with deciding m60s m80s
J. B. #348920 05/22/11 02:02 AM
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JB, those suggestions from pro amp makers unfortunately have little relevance to home audio. Using speaker ratings is essentially meaningless when the question is how much power is needed for a given sound level, not how much the speaker could take continuously without suffering damage. Generally the answer to how much is needed is far lower than the maximum speaker rating. Actually, the minimum suggested(e.g., 10 watts by Axiom for the M80)may be closer to a realistic answer to the question.

As to the Crown power calculator, the problem with using its results for home listening, which you mention, has been discussed in some detail here previously when its general use was suggested without adding cautions. The formula shown for the calculations(specifically the 20xlog factor)shows that it's simply applying a 6dB per doubling of distance sound level reduction, which is only appropriate for an omni-directional sound source in anechoic conditions. The calculator page itself contains no caution as to this source of inaccuracy. Only in a separate discussion of power needed shown here does Crown mention this, and only near the end, under "Other Considerations" is this key point briefly explained. The 6dB correction factor suggested there results in reducing the calculator's result to 1/4th of its previous value, although for some reason even then Crown doesn't explicitly point out that a much less powerful amplifier can be bought, but merely comments that the 6dB correction can be added to headroom.


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Enjoy the music, not the equipment.


Re: Help a newbie with deciding m60s m80s
JohnK #348931 05/22/11 10:27 AM
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you're right, no question about it.
sorry if it might have mislead someone.

Re: Help a newbie with deciding m60s m80s
Ken.C #348949 05/22/11 05:01 PM
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Originally Posted By: Ken.C
Heh. Not hardly too much on these puppies. The XPA-1s look pretty damn cool. I'm all in favor of equipment that has that many warning labels on it.



So I wont be causing any damage over time to these m80s? As in if I push these guys hard with the 1000w from time to time.

Re: Help a newbie with deciding m60s m80s
Nitsud #348951 05/22/11 05:09 PM
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Just don't pump bass heavy content into the M80's at super loud volumes and it should be fine. Getting up to the point where you actually use 1000w would be difficult if not impossible in most home environments.


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

-Max Payne
Re: Help a newbie with deciding m60s m80s
BlueJays1 #348955 05/22/11 05:16 PM
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If you were to actually use 1000W, you'd probably have a lot more problems than damaging the speakers.


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Re: Help a newbie with deciding m60s m80s
J. B. #348960 05/22/11 05:59 PM
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I am always curious as to the performance of some of these relatively cheap high power amps which are designed primarily for "live music" use where the noise floor, unlike those amplifiers designed for use in an A/V set-up, is not really of the same importance. I have used power amps in PA and musical instrument applications for live music and once the volume is cranked up they have a fairly audible amount of hum or hiss to them.

I am sure there are some out there that are better than others but so far, the ones I have encountered wouldn't be of much use in my A/V system.

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