Go Back   Home > Forums > Loudspeakers > Multi-Way

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
Reply
 
Thread Tools Search this Thread
Old 27th December 2001, 09:12 PM   #1
dc is offline dc
diyAudio Member
 
Join Date: Dec 2001
Location: NYC
Default Open baffles?

Hi all. I've been at this (speaker and amplifier DIY) for all of 2 weeks now... I just came across an open baffle speaker on e-speakers.com. Does anyone have opinions on this? From what I've read, the enclosure design has a LOT to do with the way the speaker sounds. Is it possible to design an audiophile quality speaker with an open baffle???

Thanks.

brad
  Reply With Quote
Old 27th December 2001, 09:37 PM   #2
Geoff is offline Geoff  United Kingdom
diyAudio Member
 
Join Date: Apr 2001
Location: UK
Yes (to second question). See http://www.linkwitzlab.com/
  Reply With Quote
Old 27th December 2001, 10:13 PM   #3
Super is offline Super  United States
diyAudio Member
 
Join Date: May 2001
Location: Connecticut
Send a message via AIM to Super
DC

Isn't the only way to have a driver free of coloration from the cabinet, to eliminate the cabinet itself? IMO, nothing compares to an open baffle midrange.
__________________
Bryan
  Reply With Quote
Old 27th December 2001, 10:35 PM   #4
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
Depending on how you look at it, open baffle speakers (bipolar or dipolar, depending on your inclination) have been around forever. Nearly every electrostatic speaker is open in back (I believe the old Beveridges were closed. Bryan, you'd have liked 'em, the cabinet was tubular, like your subs.) The planar speakers (e.g. Magnepan) are open in back.
And, yes, dynamic drivers have been used in open baffles for years. Coincidentally, I was looking for something the other day and ran across an old piece of sales literature for the Enigma subwoofer (yes, you read that right <i>sub</i>woofer). It was about the size and appearance of a Dalquist DQ-10 and used four 15" (maybe 12", I forget) drivers in an open baffle. Naturally, the response rolled off once the wavelength got long enough in relation to the panel width, but they compensated for this by boosting the output at low frequencies. An amp and driver circuit were included. The amp looked suspiciously like a Hafler DH-200 with different silk screen on the front. Whatever works...
Anyway, the thing to watch is damping. With no cabinet, the driver tends to get floppy fast, so you'll need a fairly stiff suspension on your driver if you want anything like tight bass, or mid range for that matter. (Although I've thought about the idea of a servo on the driver to tighten things up a bit...)
Bryan's observation is correct, getting rid of the cabinet is a useful thing to do. The link Geoff suggested is the only open baffle design I've seen in years; Linkwitz is a pretty smart cookie, so I imagine it sounds good.

Grey
  Reply With Quote
Old 27th December 2001, 10:55 PM   #5
diyAudio Member
 
Join Date: Oct 2001
Location: 5280'
The Legacy Whispers run free-air compound load 15"s as woofers.

We kloned them for fun. The way they load into the room is interesting, more like a planar than a conventional box. The output dies below 100Hz. Legacy supplies a bass boost box. But the one's I heard still needed a sub. Our Whisper klones are bi-amped at 100Hz to a small IB sub.

I have a open baffle prototype that uses the B&G RD-75 with a line array of 8-8" Eton woofers in free-air. They sound pretty good, but are still very much a work-in-progress.

As others have noted it's necessary to have lots of displacement so the drivers aren't overworked.
  Reply With Quote
Old 28th December 2001, 02:10 AM   #6
diyAudio Member
 
Cloth Ears's Avatar
 
Join Date: Dec 2001
Location: Melbourne, Australia
http://www.warco.com.au/awar.htm has a large (Cabasse/Raven) open baffle designed by Pat O'Brien.

Picture at http://www.warco.com.au/R3COBS.jpg

Sorry, but I haven't heard them, yet.
__________________
Jont.
"It is impossible to build a fool proof system; because fools are so ingenious."
  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
Open Baffles at RMAF-07 Pano Multi-Way 27 18th August 2008 01:08 AM
WMTMW Open Baffles Magnetar Multi-Way 47 14th November 2007 02:20 AM
New open baffles hurdy_gurdyman Multi-Way 3 26th September 2007 02:22 PM
$7 open baffles... planet10 Full Range 31 8th May 2005 07:45 AM
Open Baffles :- ) brianon Multi-Way 17 3rd February 2004 08:13 PM


New To Site? Need Help?

All times are GMT. The time now is 08:24 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