Surround style dipole : simulating box and expected SPL ? - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

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 28th May 2008, 08:37 AM   #1
jm_kzo is offline jm_kzo  France
diyAudio Member
Join Date: May 2008
Default Surround style dipole : simulating box and expected SPL ?

Hi all,
for this project, I might have to go for dipole surrounds (HT style dipole, see picture below). The room can be "seen" here and it is quite obvious (coverage angle) why dipole are likely to work better... The room is roughly 6.0mx3.0m (this is the rectangle area).

My first issue, is that WinLSD does not seem to propose this kind of set up. Any idea how the box should be calculated ?

Second question, does a dipole produces as much SPL as one driver (but "in more space"), twice as much SPL as a single driver or there is no link ?

I am asking because I do not really know where to go in terms of size. Following Dr Geddes advices, I think I will go for a full range (one on the cheap side), but between 5', 6' and 8', I do not what would suit...

The drives that that seem to fit the purpose (at this stage) are the Monacors SP-200MX, SP-200X, SP-165X and SPH-60X, or the Beyma 8AGN.
That's a quite wide range I think so please fire your advice if you have any...

Many thanks in advance.
Attached Images
File Type: png dipole.png (2.0 KB, 142 views)
  Reply With Quote
Old 29th May 2008, 05:33 AM   #2
jm_kzo is offline jm_kzo  France
diyAudio Member
Join Date: May 2008
I would really appreciate some help here...

Have I said something wrong ?
  Reply With Quote
Old 1st June 2008, 12:23 PM   #3
Svante is offline Svante  Sweden
diyAudio Member
Svante's Avatar
Join Date: Feb 2004
Location: Stockholm
Basta! can give a hint about what will happen if the box is simulated as an open baffle. Now, the box is not an open baffle but for low frequencies it will behave just as one.

Below is a comparison of a 20x30 cm baffle and a closed box with the same dimensins of the front baffle. The thin line is the maximum output level.

Click the image to open in full size.

For higher frequencies , when the depth of the box becomes comparable fractions of the wavelength the simulation will not be as accurate, though.
Simulate loudspeakers: Basta!
Simulate the baffle step: The Edge
  Reply With Quote
Old 2nd June 2008, 06:25 PM   #4
jm_kzo is offline jm_kzo  France
diyAudio Member
Join Date: May 2008
Hi Svante, thanks for the hint, I did not know Basta! and use WinLSD Pro alpha.

I will have a look.

I assume you simulated both the OB and the closed box with one loudspeaker ?

As well, what would you guess in terms of SPL for such design dipole design ? I mean compared to a one drive closed or BR system.

I am afraid of generating either "too much sound" or not enough (2x8' or 2x5').
  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
any DIY dipole surround plans? Pete_P Multi-Way 6 1st November 2009 11:54 AM
genelec style monitor mimic dipole at some freqs? mazurek Multi-Way 6 16th August 2006 09:06 PM
Dipole Surround bjackson Multi-Way 0 12th December 2004 03:39 PM
dipole surround XO design -Visaton John Allen Multi-Way 1 6th August 2004 08:07 PM
Dipole Surround Speaker Design standingwave26 Multi-Way 9 2nd June 2004 04:05 AM

New To Site? Need Help?

All times are GMT. The time now is 02:50 AM.

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