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#198876 - 03/03/08 03:21 PM Re: Understanding Power Requirements [Re: jakeman]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7123
Loc: Canada
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

-------
Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!

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#198901 - 03/03/08 05:24 PM Re: Understanding Power Requirements [Re: fredk]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10399
Loc: Calgary, Alberta
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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#198950 - 03/03/08 10:55 PM Re: Understanding Power Requirements [Re: JohnK]
chesseroo Offline
connoisseur

Registered: 05/13/02
Posts: 4832
Loc: western canada
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."

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#198953 - 03/03/08 11:25 PM Re: Understanding Power Requirements [Re: chesseroo]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6721
Loc: The Peoples Republic of Il.
 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


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#198975 - 03/04/08 05:10 AM Re: Understanding Power Requirements [Re: Wid]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7123
Loc: Canada
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!

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#198981 - 03/04/08 07:45 AM Re: Understanding Power Requirements [Re: fredk]
jakeman Offline
aficionado

Registered: 10/03/05
Posts: 852
Loc: Toronto
One spec I usually take note of in the product list as a guideline is maximum amp power. Its 240W for the M60s.
_________________________
John

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#198983 - 03/04/08 08:00 AM Re: Understanding Power Requirements [Re: fredk]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 10939
Loc: Central NH
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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