U-frame with 18" PA driver - diyAudio
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 25th September 2012, 07:58 PM   #1
diyAudio Member
 
Join Date: Feb 2002
Location: Germany
Default U-frame with 18" PA driver

This driver

http://hcdesignaudio.com/hcdesign/as...e/IT%2018S.pdf

is on sale here right now. Beautiful motor, supposedly very linear spider, +/- 9.1 mm linear travel. The big bummer is the highish fs of 49 Hz together with the rigid suspesion (Vas = 89 l).

For use at a home sub, I would like to get signicant efficiency in the 20 - 50 Hz range. However, this driver seems to do only one thing well, and that is a 200 - 300 l ported box with an fb of 37 to 40 Hz.

I tried sealed, ported and detuned ported (EQSS), and always the XXLS12 came out more efficient in a similar sized enclosure.

So the last hope to find a good application for this driver is a dipole, preferably a U-frame. However, a U-frame would also result in an fs of roughly 45 Hz. A H or W-dipole might get 40 Hz, but I am not happy with the radiation pattern.

Is there any sense in building a U-frame with a driver fs that high? I suppose only if supported by a conventional sub in the < 40 Hz range, correct?


I also suppose the only way to make the spider softer is to drill holes into it, which may have unexpted side effects.
  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
18" Sub/Bass PA danoz Subwoofers 0 20th March 2012 08:24 PM
Scaling up the SS15 for an 18" driver and other compact 18" designs col Subwoofers 32 23rd January 2012 10:17 PM
couple of questions on a custom single 18" pa sub staxx Subwoofers 9 31st October 2011 03:22 PM
DIY 18&quot; PA subwoofer cabinet CruiSE Subwoofers 17 7th June 2009 06:28 PM
Help with crossover design for 18" PA Cabinets lunchmoney Multi-Way 5 2nd October 2005 05:42 PM


New To Site? Need Help?

All times are GMT. The time now is 01:16 PM.


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