Driver params for max. efficiency in a sealed box - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 26th September 2010, 08:37 AM   #1
diyAudio Member
Join Date: Jun 2008
Default Driver params for max. efficiency in a sealed box


A theoretical question which I'd like to get an exact answer for. This is for a project, but I ask that practical questions would come later, after the theoretical side is solved.

We assume I have a sealed box of fixed size, say one cubic feet. I also have 10 Watts of amplifier power. I want to have as much output at 20Hz or 30Hz as possible. Question is, what parameters should I look for in a driver?

Quick, tentative answer. Having toyed with one of Linkwitz's spreadsheets, I have come to think that within reasonable limits, nothing else matters except force factor (BL). In simulations, the Shiva X2 does better than most, given its high BL (15.3) with coils in series.

I know that practically, everything I need, is to see that my chosen driver will reach its excursion limits at low frequencies, given the amplifier power I have. Theoretically one can buy very much very cheap wattage using readily available PA power amplifiers. But if I want to get along with an amplifier I already have, and avoid problems with power compression, this viewpoint might have some use.
  Reply With Quote
Old 26th September 2010, 10:17 AM   #2
wjlamp is offline wjlamp  Greece
diyAudio Member
Join Date: Nov 2009
Location: Athens,Greece
As much as possible,says nothing.The "as much" could be anything from 0.00001 acoustic watts.
There are so many factors to be computed into the equation,that a box-driver compo should have,in order to function as you want,with your 10W amplifier,that is non wise to try to single out one,in your case BL.
Your question is a little tricky.

B.L (not the force factor)
  Reply With Quote
Old 26th September 2010, 11:39 AM   #3
diyAudio Member
Mosquito's Avatar
Join Date: Sep 2009
Location: Santa Fe, Argentina
Give a read to that:
fig.8 and fig.11 charts will give you a rough idea of what can you expect, from a 10W amplifier at 20Hz f3 , from your already fixed box volume..
"It is less serious than if worst"

Last edited by Mosquito; 26th September 2010 at 11:59 AM.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
which 10 inch driver in a sealed box qguy Subwoofers 26 9th December 2008 04:55 PM
Driver for sealed box rho Multi-Way 13 13th November 2007 05:57 AM
Mid/Bass Driver QTS for Sealed Box Loudspeaker? bssk Multi-Way 0 7th November 2006 06:57 AM
Which driver for a small sealed box. ShockValue Subwoofers 21 16th June 2005 04:25 PM
Bass(ish) driver for 1.5cf sealed box. sfdoddsy Multi-Way 7 8th September 2002 07:32 PM

New To Site? Need Help?

All times are GMT. The time now is 02:28 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2