Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

reference 3a woofer design
reference 3a woofer design
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 13th August 2008, 09:53 AM   #1
DAMIC is offline DAMIC  Serbia
diyAudio Member
 
Join Date: Jan 2006
Location: Beograd
Default reference 3a woofer design

Hi,

Any idea, how they manage to make the woofer that do not need any x-over.

http://www.reference3a.com/

regards,
  Reply With Quote
Old 29th August 2017, 12:56 AM   #2
GringoAudio is offline GringoAudio  Canada
diyAudio Member
 
Join Date: Oct 2007
They don't manage to make a woofer that doesn't need a crossover. It really DOES need one.
Have you seen how badly the MM deCapo measures in the Stereophile review? Yet they like them? Everything in that review and the measurements section SCREAMS for a decent crossover to tame the peaks at the very least. And running a 7" full range? Cone breakups are going to happen. Seriously a snake oil product.
A guy in town is selling some at a decent price and is willing to bring them over for an audition. I am tempted to waste his time and have him bring them by. Stay tuned ...
Reference MM de Capo i loudspeaker Measurements | Stereophile.com
  Reply With Quote
Old 29th August 2017, 12:59 AM   #3
planet10 is offline planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
reference 3a woofer design
I’ve heard them, a long time ago… not too bad. From the measures the woofer issues are at about 1 kHz, it is the tweeter that needs taming.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 29th August 2017, 01:55 AM   #4
eriksquires is offline eriksquires  United States
diyAudio Member
 
eriksquires's Avatar
 
Join Date: May 2013
With some models, the tweeter phase is as much suspect as the lack of a LP filter on the woofer. They measure pretty funky.

Best,

E
__________________
All of my successes and failures can be explained by my attempts at getting a girlfriend. All of them.
  Reply With Quote
Old 29th August 2017, 02:30 AM   #5
system7 is offline system7  United Kingdom
diyAudio Member
 
system7's Avatar
 
Join Date: Aug 2008
Location: Portsmouth UK
I'll have a go at this. A woofer that doesn't need a crossover.

SEAS The Art Of Sound Perfection

Actually, there IS a crossover. It's a simple inductive 3.5mH coil built into the voice-coil. This works well with a 10" bass cone which has a certain natural damping.

By the time you get down to 6" cones, you possibly need a plastic or polycone woofer to stay well behaved. Like the old Vifa P17. In fact the Vifa didn't have huge voicecoil inductance, so you just added a mH or so.

But really, I never understand what people think is great about no crossover. Even with the SEAS A26, a certain amount of electrical shaping is a good thing.

The theory goes that electrical damping is far more linear than mechanical damping. Maybe a bit of both works best.
Attached Images
File Type: jpg WD25 EX Peter Comeau.JPG (24.6 KB, 60 views)
File Type: jpg WD25 EX Crossover.JPG (26.9 KB, 59 views)
__________________
Best Regards from Steve in Portsmouth, UK.
  Reply With Quote

Reply


reference 3a woofer designHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Reference book for amp design Ted205 Solid State 7 30th March 2009 02:02 PM
New 500W reference design from Zetex thecyberdude Class D 1 1st April 2005 10:14 PM
LS3/5a as reference for X-over design ekaerin Multi-Way 6 18th September 2004 06:50 PM
Favorite Woofer chassis, for reference. D.A.R.R.Y.L. Multi-Way 2 31st March 2002 04:49 PM
Inducter Design Reference bwoca Multi-Way 2 25th April 2001 01:12 AM


New To Site? Need Help?

All times are GMT. The time now is 12:21 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki