Get Free, Friendly, Expert Advice
Call 1-866-244-8796 or email

Designed and Manufactured in Canada Since 1980


AxiomAudio Blog

Sneak Peek into Axiom’s Current Research and Development

Axiom’s Newest Speaker: The In-Ceiling M3

Outdoor Speaker Placement

Wall'O'Fame
Experimental Atmos
Greetings fellow Axiom owners...
Who's Online
3 registered (bridgman, a401classic, MarkSJohnson), 156 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Financing
Forum Stats
13323 Members
11 Forums
22900 Topics
404654 Posts

Max Online: 378 @ 02/24/13 04:33 PM
Top Posters
Ken.C 17782
pmbuko 16280
SirQuack 13337
CV 11208
MarkSJohnson 10904
Meanwhile On Facebook

󾓶 The first review of the LFR880s is out! "If you are adding or upgrading stere...

So much going on in this month's newsletter - new product announcements, a new v...

Love this comment from Doug T! "The M22 bookshelf speakers sound so clean and a...

Page 1 of 3 1 2 3 >
Topic Options
Rate This Topic
#198667 - 03/02/08 01:30 AM Understanding Power Requirements
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7047
Loc: Canada
Just found a web page that explains some of the stuff I have been wondering about with respect to power requirements for speakers. I was wondering what sort of head room requirements I might have depending on the dynamics of the music I am listeneing to, the volumes and listening distances.

The page even has a link to a calculator you can use to figure out what you need for your particular situation. Its meant for professional musicians, but it should work just fine for the rest of us as well.

I found their suggestions for headroom for different types of music (as much as +25db for some types of music) quite interesting.

Crown audio link

Enjoy.

P.S. I know, I know, M60s are easy to drive. Any decent receiver will do. I'm bored...
_________________________
Fred

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

Top
#198668 - 03/02/08 01:55 AM Re: Understanding Power Requirements [Re: fredk]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7047
Loc: Canada
OOooooh, this is fun!

M60 at 2.5 meters, 95 db spl and 10db headroom = 99w
Bump that to 105 db spl and the max power required jumps up to 313w!

So, if you listen to music with a lot of dynamic range, your power requirements really jump.

Want to handle 25db peaks withoug clipping at 95db spl? You will need a cool 3,132 amps of power!

Fred
_________________________
Fred

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

Top
#198676 - 03/02/08 11:20 AM Re: Understanding Power Requirements [Re: fredk]
doormat Offline
devotee

Registered: 10/28/07
Posts: 395
Loc: Cold Lake, AB
...and a hearing aid.
_________________________
M80s/VP160/QS8s/EP350; M22s; M3s.

Top
#198713 - 03/02/08 04:26 PM Re: Understanding Power Requirements [Re: doormat]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7047
Loc: Canada
Meh... need a hearing aid already... ;\)

For me, playing with the calculator really drove home what folks here have been saying. I guess I am a visual guy, because I couldn't quite put it all together before playing with the calculator.

One thing I still wonder about is what the danamic range I can expect out of the music I listen to. The Crown website seems to suggest +15db peaks is reasonable

Something Alan Loft wrote in his article about power has stuck in my mind. Music played cleanly as high spls dosn't sound loud.

Put that together with a speaker like the M80 or less efficient speakers in a larger space with music that has high dynamic range, and I can see how you very quickly exceed the power requirements of your average receiver if you want clean playback at reasonable volumes.

As for hearing loss, I wonder if very short peaks 25db above and average listening volume of 85db will lead to hearing loss. Thats a lot different than running equipment for 8 hours a day that generates a continuous 110db of noise.

Fred
_________________________
Fred

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

Top
#198729 - 03/02/08 06:55 PM Re: Understanding Power Requirements [Re: fredk]
jakeman Offline
aficionado

Registered: 10/03/05
Posts: 852
Loc: Toronto
Good article. I like the quick way the calculator adjusts for sensitivity and dyanmic range.
_________________________
John

Top
#198746 - 03/02/08 07:34 PM Re: Understanding Power Requirements [Re: jakeman]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10398
Loc: Calgary, Alberta
Holsts' The Planets has about 50 db range so to listen at a mere 60db @ 2.5 meters, for the quiet parts the Amp requirements jump to 198W and that's if I use the in room sensitivity of the M80s. When using the anechoic I need - 496W
_________________________
Jason
-----------------
TTTHHHPPPPPTTTT!

My HT

Top
#198754 - 03/02/08 07:45 PM Re: Understanding Power Requirements [Re: jakewash]
mapatton Offline
local

Registered: 12/16/07
Posts: 243
Loc: Orlando, FL
I think this speaks to have distributive power :)Not all your channels need to have this at the same time. I would use 25db as a realistic expectance..


Edited by mapatton (03/02/08 07:47 PM)
_________________________
Mark
Pio 94,SB3,BD30,A35,Pio 48AV.Pronto 7000 controlling all. Getting ready for 22s, 150 & QS8s.

Top
#198759 - 03/02/08 07:50 PM Re: Understanding Power Requirements [Re: mapatton]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10398
Loc: Calgary, Alberta
When listening to the Planets, SPL meter in hand, the range peaks at 53 db. so 25 would not suffice, as we are talking total range.
_________________________
Jason
-----------------
TTTHHHPPPPPTTTT!

My HT

Top
#198768 - 03/02/08 08:46 PM Re: Understanding Power Requirements [Re: jakewash]
mapatton Offline
local

Registered: 12/16/07
Posts: 243
Loc: Orlando, FL
So plan on 50+? Will do.

Gosh like I needed another reason to get a new amp.
_________________________
Mark
Pio 94,SB3,BD30,A35,Pio 48AV.Pronto 7000 controlling all. Getting ready for 22s, 150 & QS8s.

Top
#198769 - 03/02/08 08:47 PM Re: Understanding Power Requirements [Re: jakewash]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7047
Loc: Canada
John. I agree: pretty cool!! I think these two pages should be stickied on one of the forums here. Its a very concise explanation of power requirements and the things that AND it gives examples of spl's and headroom for various types of music.

Mark. It took a while to parse that first sentence, but I get you. I don't think a lot of people appreciate just what Axiom has done with their new amp.

If +25db is a reasonable requirement for peaks, at 85db spl, I would need 200 amps to drive the M60s clean... but I can get to about +23db on 120w On the Crown page they use +15db peaks as typical for home audio. For +25db I would need around 200w.

So, how much power I need really, really depends on how loud I like to listen to my music. This is something I want to establish when I go to give various speakers a listen at Axiom.

 Quote:
so 25 would not suffice, as we are talking total rang

This is where I get confused when people talk about dynamic range. Are youl talking about total range as in from the quietest to the loudest? If I understand the way the calculator works, they are talking about peaks above average spl.

Another interesting thing on the link is that their chief engineer says that amplifyer continuous and peak power are virtually identical. Maybe he was refering only to Crown's amps, but I don't think so.

Fred
_________________________
Fred

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

Top
Page 1 of 3 1 2 3 >



Moderator:  alan, Amie, Andrew, axiomadmin, Brent, Debbie, Ian, Jc 

Home  |  Corporate Info  |  Products  |  Message Board  |  FAQs  |  Warranty  |  Site Map  |  Privacy Statement   |  Contact Us

©2014 Colquhoun Audio Laboratories Limited
All Rights Reserved.