Go Back   Home > Forums > Loudspeakers > Subwoofers

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
Reply
 
Thread Tools Search this Thread
Old 1st January 2012, 11:22 AM   #1
DogStar is offline DogStar  Europe
diyAudio Member
 
Join Date: Mar 2011
Default Selecting Drivers for Dipole Subwoofer

Happy new year to you all

I am in the planning of my first dipole speaker project. As part of the project, I am considering building stereo dipole subwoofers. The design goals are to obtain a well controlled bass with a system Q of around 0.5-0.7 that can reach 30-35Hz at a reasonable spl (of course WAF will be close to 0). The design I have in mind is similar to the design of Stig Erik:

http://www.diyaudio.com/forums/multi-way/142015-my-open-baffle-dipole-beyma-tpl-150-a-103.html

In this design, I will have 2x18 (or 2x21) per side in H-baffles. I intend to xo to a 15 midbass, also in a open baffle construction. As a starting point, I think the xo frequency should be somewhere around 80-100 Hz. For the sake of flexibility, it is desirable if the subs can extend to 150-200Hz if needed. I intend to xo actively with eq.

At this moment, I am considering a handful of different pro drivers for the subs:

1) Beyma 21SW1600Nd (21, the same as Stig Erik is using).
http://profesional.beyma.com/ingles/pdf/21SW1600Nd.pdf

2) The new Beyma 18LX60V2 (18)
http://profesional.beyma.com/ingles/pdf/18LX60V2.pdf

3) BMS 18n840 or 18n860 (18)
http://bmsspeakers.com/index.php?id=neodymium_cone_drivers

The 21SW1600Nd has the advantage of being large (large sd) with a healthy xmax of 15mm. The 18LX60V2 generally seems to fit the bill quite well with a Qt close to 0.5 and fs at 35Hz. This driver has an ok xmax ok 9mm. The BMS drivers look pretty awesome too with their low distortion design. However, the BMS drivers are less efficient and their specs. may be less suitable for this application. In addition, the BMS drivers are considerably more expensive than the Beyma drivers. Especially, the 18LX60V2 comes at a very favorable price compared to the rest of the pack.

At this point, I am leaning towards the Beyma 18LX60V2 as the best compromise.

I would highly appreciate any comments, experience and (or) recommendations you may offer. What are the key factors to consider when designing a dipole subwoofer? Another issue is, how important is inductance when it comes to SQ? The Beymas typically have higher inductance compared to many other drivers out there.

Cheers David
  Reply With Quote
Old 1st January 2012, 04:27 PM   #2
diyAudio Member
 
Join Date: Sep 2008
One very important thing to consider is cooling, or rather the noise of it. As there is no box behind the driver to attenuate it.

I would look at B&C. I have only heard good bout their cooling.
And you can't say no to their basket design.
  Reply With Quote
Old 1st January 2012, 05:07 PM   #3
tinitus is offline tinitus  Europe
diyAudio Moderator
 
Join Date: Nov 2005
Quote:
Originally Posted by DogStar View Post

At this point, I am leaning towards the Beyma 18LX60V2 as the best compromise.
looks good

I was surpriced seeing it a couple of weeks ago
  Reply With Quote
Old 1st January 2012, 05:37 PM   #4
DogStar is offline DogStar  Europe
diyAudio Member
 
Join Date: Mar 2011
Quote:
Originally Posted by David_Web View Post
One very important thing to consider is cooling, or rather the noise of it. As there is no box behind the driver to attenuate it.

I would look at B&C. I have only heard good bout their cooling.
And you can't say no to their basket design.
Thanks for the reply

I had this potential problem in mind. My thought was that several large drivers will limit excursion and thereby any noise made by the drivers. I have looked at the B&C drivers. Especially their 21” driver looks good (and, yes, that basket design is very cool). Unfortunately, the price is rather high compared to the Beyma 21SW, at least here in Norway.

David

Last edited by DogStar; 1st January 2012 at 05:43 PM.
  Reply With Quote

Reply


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
First Build-selecting drivers. zxgravediggerxz Multi-Way 25 7th December 2011 01:37 AM
Trouble selecting drivers sun850 Car Audio 1 25th October 2010 11:52 AM
selecting drivers iceblueorbitz Multi-Way 4 16th June 2006 10:45 AM
Need help selecting between two budget 10" drivers percy Multi-Way 3 16th March 2005 10:28 PM


New To Site? Need Help?

All times are GMT. The time now is 07:10 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2