Speaker for Bi-Amping - diyAudio
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 1st July 2004, 08:15 PM   #1
diyAudio Member
 
Join Date: Jul 2004
Location: Edinburgh
Default Speaker for Bi-Amping

Hi All,

First ever post . . . . .

I've been considering exploring bi-amping and active crossovers.

I thought I might use a pair of Wharfedale 505.2 that I have but I can't see how to open them up to remove the passive crossover, etc. They have no visible external fixings - not even around the drive units. Surely they're not completely glued together ?

So can anyone tell me how to open them up without damaging them ?

OR can anyone suggest a sensible LS that is amenable to modification. Ideally it would have to be a 2-way unit because I would prefer to build four channels of electronics rather than six. It would also have to be good enough to show some benefit from the modifications and be readily available on the second hand market.

BTW I'm considering the Elliott Sound Products MOSFET amplifier, Project 101 here:
http://sound.westhost.com/projects-1.htm
and an active crossver either from ESP or one of the ones on the Linkwitz web site.

All comments and suggestions gratefully received.

Mikegm47
  Reply With Quote
Old 2nd July 2004, 06:31 PM   #2
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
As far as I recall The 505.2 uses a bayonet mounting
arrangement for the drivers, (similar to a camera lens).

To remove them you need to arrange some method
of twisting the drivers in a circular fashion.

IMO a 2 way is not particularly worth bi-amping,
and you can't simply substitute an active c/o with
classical filter functions for a passive 2 way crossover.

IMO a 3 way is a much better idea but with a mid/treble
passive crossover, however if the Mid has BSC ideally this
should be removed and implemented actively.

Class A or valve for mid/treble would be nice.

But what speaker ? a fair conumdrum.

TBH I can't think of a particularly suitable good loudspeaker.

Edit :
http://www.richersounds.com/index.ph...l.php&p=301821

At the price could be worth a punt - there's lots you could
do to them to improve performance if you know what you
are doing.
If the bass / mid crossover is first order (more than likely)
then you could use passive line crossovers at the input to
your amplifiers, which would make adjustment easy.

sreten.
  Reply With Quote
Old 5th July 2004, 10:10 AM   #3
diyAudio Member
 
Join Date: Jul 2004
Location: Edinburgh
Thanks sreten,

Bayonet mounting of the drivers is consistent with some strange blind holes in the metal ring around the drivers, probably for locating a removal tool.

With regard to the crossover itself, I had two thoughts. The first was to extract the original one and then measure or calculate it's response and use it as a starting point. Alternatively, measure the response of the individual drivers in the enclosure and design a suitable crossover from scratch.

Although neither approach is particularly easy, it should be easier than designing a passive crossover because of the isolation between the active crossover and the driver load.

The LS from Richer Sounds certainly look interesting !

Best regards,

mikegm47
  Reply With Quote
Old 5th July 2004, 10:17 AM   #4
diyAudio Member
 
Join Date: Jul 2004
Location: Edinburgh
sreten,

BTW, Why do you say that two-way units are not worth bi-amping ?

My thinking was that the benefits of bi-amping were: better behaviour around the crossover frequency, better driver damping and arguably the possibility of phase coherence. These should be equally applicable to 2-way and 3-way units ?

Best regards,

mikegm47
  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
Bi-Amping a 3-way Speaker ronzeman Multi-Way 1 11th September 2008 09:21 PM
Bi amping adventfan Solid State 14 26th June 2008 03:28 PM
Tri amping SOZ Magura Pass Labs 6 8th January 2004 08:51 PM
Bi-amping set up? MikeW Pass Labs 8 13th November 2003 02:27 AM
Bi-amping help Kilowatt Multi-Way 2 18th November 2001 07:47 PM


New To Site? Need Help?

All times are GMT. The time now is 02:26 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