Go Back   Home > Forums > >

Multi-Way Conventional loudspeakers with crossovers

Do you dampen a Uframe?
Do you dampen a Uframe?
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
Old 28th July 2015, 03:27 AM   #11
kimmosto is offline kimmosto  Finland
diyAudio Member
 
kimmosto's Avatar
 
Join Date: Oct 2005
I'm clearly biased towards super-cardioid bass due to good experiences in several houses and flat apartments. It is possible to get better response with dipole but it's not very likely and easy. Super...hyper-cardioid is quite insensitive to source location though cannot eliminate lowest axial room mode if room has massive & reflective rear wall. Weakest features of cardioid in practice are low efficiency (leaking box) and required volume (dipole+boxed combination). In many cases front wall and corner reflections boost mid-bass with dipoles, but this gain is not available with cardioid. Fortunately weak front reflections improve integration of bass and mid-range.
I wouldn't consider damped U-frame (with solid side walls) because cardioid band is too narrow. Whole bass range should be super...hyper-cardioid in order to make valid selection of source type. Without adequate damping it's just a bad dipole.
  Reply With Quote
Old 28th July 2015, 04:11 AM   #12
keyser is offline keyser  Netherlands
diyAudio Member
 
keyser's Avatar
 
Join Date: Oct 2004
Location: The Netherlands
I've been planning to build a U-frame. From what I've heard, it's difficult to get it right, but it seems nobody's ever documented and shared the optimization on the basis of clean far-field measurements with sufficient frequency resolution. I'm very curious how well an optimized U-frame performs, especially in comparison with a box with side-vents.
__________________
Dutch & Dutch
  Reply With Quote
Old 28th July 2015, 05:21 PM   #13
kimmosto is offline kimmosto  Finland
diyAudio Member
 
kimmosto's Avatar
 
Join Date: Oct 2005
I would make U-frame with leaking (=resistive) side walls to reduce problems due to solid transmission line. Leakage should help tuning because damping alone doesn't have to do everything. Partial side port may also extend usable frequency range until upper bass. "Cardioid bass" is worthless without cardioid upper bass, imo.
Cardioid pattern close to near field is valuable in practice. Otherwise front wall and corners may boost rear port signal.
  Reply to this post

Reply


Do you dampen a Uframe?Hide this!Advertise here!
Thread Tools

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Dampen transformer endbells? pjanda1 Tubes / Valves 13 22nd January 2013 08:25 AM
Do lighter cones of a given size dampen and settle quicker? asberrys Multi-Way 19 13th July 2012 04:05 PM
Is it possible to dampen a partially microphonic 12ax7? DrStrangelove Tubes / Valves 8 5th May 2011 12:19 AM
Dampen metal cone resonance: How much is enough? gary f Multi-Way 33 14th February 2009 04:53 PM
JBL E140 suited for OB Uframe sub ?? Buhl Subwoofers 3 19th December 2005 09:50 AM


New To Site? Need Help?

All times are GMT. The time now is 04:46 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki