Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Cabinets-Speakers => Topic started by: Willabe on January 07, 2023, 10:19:07 am

Title: Are larger diameter speakers a little louder?
Post by: Willabe on January 07, 2023, 10:19:07 am
Given all things the same, brand, power handling, sensitivity, cone, etc. is a 12" speaker a db or 2 louder than a 10" speaker?

If so it would be because it pushes a little more air?

     Thanks,  Willabe
Title: Re: Are larger diameter speakers a little louder?
Post by: pdf64 on January 07, 2023, 11:13:19 am
Yes, that seems to be the way it works.
It probably something along the lines of ‘larger cone area provides improved acoustic coupling’.
Title: Re: Are larger diameter speakers a little louder?
Post by: Willabe on January 10, 2023, 11:19:49 am
Sorry for taking so long to respond.

That's what I was thinking. Thank you pdf64.   :icon_biggrin:
Title: Re: Are larger diameter speakers a little louder?
Post by: Lectroid on January 18, 2023, 12:01:47 pm
I just did some sophomore math and is this right?  "A = Pi x diameter" says that two 10" speakers have more pushing area than a 15" or even an 18" speaker?

Sanity check, anybody?
Title: Re: Are larger diameter speakers a little louder?
Post by: Keppy on January 19, 2023, 06:28:54 pm
That's the formula for circumference. Area is pi x radius(squared).


So a 10" speaker is 100pi squinches.
2 of 'em is 200pi.
A 15" is 225pi.
Title: Re: Are larger diameter speakers a little louder?
Post by: Lectroid on January 23, 2023, 10:38:55 am
Keppy,

Thank you.    It looked way off to me.  I need to brush up on math.

Title: Re: Are larger diameter speakers a little louder?
Post by: GAStan on March 09, 2023, 04:20:10 pm
Quote from: Keppy on January 19, 2023, 06:28:54 pm
That's the formula for circumference. Area is pi x radius(squared).


So a 10" speaker is 100pi squinches.
2 of 'em is 200pi.
A 15" is 225pi.

A 10" speaker is 10" DIAMETER.  The formula is pi x RADIUS squared.
Title: Re: Are larger diameter speakers a little louder?
Post by: acheld on March 10, 2023, 10:32:51 am
Speaker areas:

8"   -- 50 sq in
10" -- 79 sq in
12" -- 113 sq in

But I believe speaker area calculated like this is not accurate due to limited cone movement around the perimeter.  Suspect this is well understood by speaker engineers . . . 

My own experience is that two 10" speakers are about as loud as a 12" speaker with the same power and roughly the same efficiency ratings. 

They don't sound the same to me -- I really like two 10" speakers with some of my amps, but others do well with a single 12 (all Celestion Gold speakers).   Couldn't begin to understand why . . .
Title: Re: Are larger diameter speakers a little louder?
Post by: shooter on March 10, 2023, 12:01:52 pm
Quote
Suspect this is well understood by speaker engineers . . .
an their formulas are crazy
I always liked motive force, sounds like a mad max throw-away line  :icon_biggrin:
Title: Re: Are larger diameter speakers a little louder?
Post by: Keppy on March 12, 2023, 12:19:28 pm
Quote from: GAStan on March 09, 2023, 04:20:10 pm
Quote from: Keppy on January 19, 2023, 06:28:54 pm
That's the formula for circumference. Area is pi x radius(squared).


So a 10" speaker is 100pi squinches.
2 of 'em is 200pi.
A 15" is 225pi.

A 10" speaker is 10" DIAMETER.  The formula is pi x RADIUS squared.
D'oh! You're right. The ratios between speaker sizes work out the same, but my numbers were wrong.