Welcome, Guest. Please Login or Register
Decware Audio Forums
03/28/24 at 20:00:27 




Pages: 1
Send Topic Print
Speaker efficency spec conversion? (Read 1770 times)
Sam S
Verified Member
**




Posts: 15
Speaker efficency spec conversion?
01/15/21 at 02:18:12
 
I am considering getting in line to buy a Rachel soon.
I have an old pair of Braun L 810 speakers (4 ohm) that have an Efficiency rating of 88dB with 2 watts input at 10 ft.

Does anyone know how to convert the above to the standard of 1 watt at 1 meter?

Thanks - Sam
Back to top
 
 
  IP Logged
CAJames
Seasoned Member
****


"I've run every
red light on memory
lane."

Posts: 1589
Re: Speaker efficency spec conversion?
Reply #1 - 01/15/21 at 02:32:40
 
I think the rule of thumb is doubling the  power = +3 dB SPL and doubling the distance = -6 dB SPL. And of course 10 feet = 3 meters so:

88 dB at 2 Watts at 3 M =

85 dB at 1 Watt at 3 M =

95 dB at 1 Watt a 1 M

Q.E.D.


Back to top
 
 

[FOOBAR2000 | Jay's CDT2 MRK3] -> Denafrips Terminator 2 + Gaia
Sumiko Pearwood -> Mapleknoll Athena -> Luxman SUT -> Maple-tree Phono 3E
Woo WA22 -> 2x UFO25s, balanced monos
Omega SAM , Hifiman Arya, Senn HD-650
  IP Logged
Lin
Ex Member



Re: Speaker efficency spec conversion?
Reply #2 - 01/15/21 at 04:05:39
 
Welcome to the forum Sam.

It is impossible to know exactly how much the 10 ft distance affected the spl in their measurements, but the 2 watts @ 4 ohms is = to 1 watt @ 8 ohms (2.83v).

Somewhere in the low 90s would be my guess at 1w/1m.
The ADS is spec'ed at 6 ohms nominal and 94dB = @92.5 1w/1m
Many companies show spl as 2 speakers in a room (=higher number) and a few measure 1 without room reinforcement (=lower number).

I like this spl calculator since it reflects my experience of levels in the typical small rooms in a house vs. a large performance venue that some pro audio calculators are aimed at.
https://myhometheater.homestead.com/splcalculator.html

Trying a combination is the only sure way to know if low power will work for each individual since we all listen to different music, in different rooms, and at different levels.

I'm completely satisfied with a 4 watt EL84 sep amplifier and 90 dB Fostex speakers in a 12' x 14' spare bedroom.
Back to top
 
 
  IP Logged
DPC
Ex Member



Re: Speaker efficency spec conversion?
Reply #3 - 01/15/21 at 15:34:38
 
Nifty little SPL Calculator there Lin!

Thanks

Dennis
Back to top
 
 
  IP Logged
Lin
Ex Member



Re: Speaker efficency spec conversion?
Reply #4 - 01/15/21 at 17:34:45
 
Hey Dennis, hope you are well. Smiley
Back to top
 
 
  IP Logged
Pages: 1
Send Topic Print