SpeakerTalk Forum Index SpeakerTalk
This forum has been set up to facilitate discussion of 1970s KEF speakers and drive units. The owner of the Forum has no connection with KEF Audio.
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Suitable Xover for Coda Boxes...

 
Post new topic   Reply to topic    SpeakerTalk Forum Index -> KEF Speakers from the 1970s
View previous topic :: View next topic  
Author Message
Seymour
Introductory Contributor


Joined: 04 Jun 2007
Posts: 7
Location: Melbourne, Australia

PostPosted: Wed Jun 06, 2007 11:07 am    Post subject: Suitable Xover for Coda Boxes... Reply with quote

Hi all,

Instead of hijacking the "Coda crossover" thread, I've created a new topic for my issue (sorry mods) -

I have purchased a pair of original Coda boxes off e-Bay that are in excellent condition. I am aiming at installing the following driver set and I need assistance with the choice of xover. Do I use the original Coda design or the CS1. The B110 is not ideal (6-ohms), but it's all I've got. All comments/recommendations are greatly appreciated:

- T27A SP1032
- B110 SP1228 (6-ohm)
_________________
Tks,

CS
Back to top
View user's profile Send private message
proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1297
Location: Tewkesbury UK

PostPosted: Wed Jun 06, 2007 11:16 am    Post subject: Re: Suitable Xover for Coda Boxes... Reply with quote

I see little reason as to why you cannot use the CS1/CS1A design for the T27.
2nd order as you proposed in the original thread may have the T27 getting upset with some material.

Not knowing its 'foibles' I'd go for 2nd order regarding the B110 to start with...
_________________
I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill
Back to top
View user's profile Send private message Send e-mail
Seymour
Introductory Contributor


Joined: 04 Jun 2007
Posts: 7
Location: Melbourne, Australia

PostPosted: Wed Jun 06, 2007 11:23 am    Post subject: Reply with quote

Proffski, again thanks for the reply. Rather than mixing xover methods, what about sticking to the CS1 for both sections?

PS - I'm an experience constructor (active components) but green when it comes to the passive stuff such as xovers.
_________________
Tks,

CS
Back to top
View user's profile Send private message
proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1297
Location: Tewkesbury UK

PostPosted: Wed Jun 06, 2007 1:48 pm    Post subject: Reply with quote

It is not unusual at all for loudspeaker manufacturers to have different slope crossovers for different drivers in the same enclosure.

I'd go for the CS1 HF and a 2nd order for the Mid/Lf unit...

ThenI'd use white & pink noise for final tweaking before trying on various voice, strings etc against a good but similar modern design.
_________________
I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill
Back to top
View user's profile Send private message Send e-mail
proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1297
Location: Tewkesbury UK

PostPosted: Wed Jun 06, 2007 3:19 pm    Post subject: Reply with quote

Basic rudimentary crossover design is just that, rudimentary!
All units have their peaks, resonances and dozens of factors which will one way or another interact with a "Theoretical" crossover.

There are many sites on the internet which will at least give you some idea between the rate of roll off as well as the classic variants such as Butterworth, Chebychev, Linkwitz – Riley etc.

Have a peek here: http://www.lalena.com/Audio/Calculator/XOver/
_________________
I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill
Back to top
View user's profile Send private message Send e-mail
ColinR
Über Contributor 1000+


Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Wed Jun 06, 2007 7:20 pm    Post subject: Reply with quote

Just build the "11 ohm Crossover FL6/38 SP2128" from the what's inside element of www.ls35a.com it's tried and tested and you don't have to get into the design side of reducing inductor sises to match the impedance of your B110C.
_________________
This post or any other information supplied to this website or any other by myself is not available for any form of commercial purpose i.e. to hi-fi magazines or as sales and marketing material for sleezeBay or Audiodogging pimps and the like.
Back to top
View user's profile Send private message
Seymour
Introductory Contributor


Joined: 04 Jun 2007
Posts: 7
Location: Melbourne, Australia

PostPosted: Wed Jun 06, 2007 10:27 pm    Post subject: Reply with quote

Thanks Proffski & Colin. Will investigate my options and let you all know how it ends up.
_________________
Tks,

CS
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    SpeakerTalk Forum Index -> KEF Speakers from the 1970s All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group