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Re: Understanding Power Requirements
jakeman #198876 03/03/08 08:21 PM
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I checked out the Alegro calculator. You get the same result adding 5 to the sensitivity or subtracting it from listener spl or headroom. In the formula those three numbers are just added or subtracted to/from each other, so order (where you apply the 5db room correction dosn't matter).

Either way it dosn't matter, with the room correction and the M60s I'm back to... what was that thing you guys kept telling me?

Oh yea, "The M60s are easy to drive. Any decent receiver will work just fine"


Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!
Re: Understanding Power Requirements
fredk #198901 03/03/08 10:24 PM
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Yes, but as the results are showing, it depends on how loud you like to listen and how much dynamic range is involved. For most of us the usual amps and receivers are what we can afford and they do the job admirably.\:\)


Jason
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Re: Understanding Power Requirements
JohnK #198950 03/04/08 03:55 AM
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Both these calculators produced required watts beyond my equipment specs. The typical listening level for movies sits near a max level for required wattage and possibly beyond on more limited occasions so a separate amp for that system is still required.

Listening to music while cooking in our kitchen, 21 feet or 7m from the main system with 91dB sensitivity at 85dB preferred sound level (slightly louder than JohnK's preference) and 20dB of headroom provides for 309W (or 389W w Allegro).
The amp is only rated for 225W aside, best case scenario.
Obviously i have not attained such conditions successfully.

Buy as much power as you can comfortably afford if you are a person who likes to turn things up and/or step further away from one's system.


"Those who preach the myths of audio are ignorant of truth."
Re: Understanding Power Requirements
chesseroo #198953 03/04/08 04:25 AM
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 Quote:
Buy as much power as you can comfortably afford if you are a person who likes to turn things up and/or step further away from one's system.


Very good advice, I tell people this same exact thing when asked how much power is needed.


Rick


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

Re: Understanding Power Requirements
Wid #198975 03/04/08 10:10 AM
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fredk Offline OP
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Well, OK I was being a little glib. I think an 80w receiver might be marginal for the M60s. I am thinking that the soon to be released Yamaha RC-V663 will be a good match for me, particularly if it has the same power supply/amp section as the 659. That unit got very good reviews for its amp section at Audioholics.

I found it interesting that the folks at Crown were suggesting 1.5 to 2.5 times the speakers rated maximum power as a guideline for choosing an amp.

For the M60 that would be 300 - 500w!!

One of the things I plan to do when I visit Axiom is to see where my comfort level is with volume. OK, I'm pumped to go do some listening.


Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!
Re: Understanding Power Requirements
fredk #198981 03/04/08 12:45 PM
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One spec I usually take note of in the product list as a guideline is maximum amp power. Its 240W for the M60s.


John
Re: Understanding Power Requirements
fredk #198983 03/04/08 01:00 PM
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I wish I could afford a nice outboard amp, as I do usually have my system pretty loud as I'm frequently in the next room.

Two quick points, though: I think John's note of their inconsistencies aren't surprising in that they DO sell amps.

Secondly, on a less "suspicious" note, they are also in the market for the professional, live sound musician, where the dynamic range can be quite a bit wider than the recordings most would listen to at home. And, as they correctly point out, it's dynamic range that really "hogs the watts".


::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::
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