Zobel with Jordan JX92s fullrange? - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

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 14th September 2004, 12:33 AM   #1
diyAudio Member
 
cheesehead's Avatar
 
Join Date: Mar 2004
Location: Western Wisconsin (almost Minnesota)
Default Zobel with Jordan JX92s fullrange?

So, I've built the GM/Abpea "first draft" Jordan JX92s MLTL's. Described right here. They're beautiful. Right now I'm listening to Michael McDonald's "Motown" - I still jump at some of the percussion, it's that good.

But I want to add baffle step compensation, 'cuz Michael's a little weak. OK, I can do inductors & follow formulas, and get about a 2 mH inductor || with a resistor I'll play around with to match the room. But I noticed that Martin King & Bob Brines have included a zobel with their Fostex full-range designs... on the other hand, from what I can find Jim Griffin's Jordan design does not.

Should I include a zobel for the Jordan?

mk
  Reply With Quote
Old 14th September 2004, 01:44 AM   #2
diyAudio Member
 
cheesehead's Avatar
 
Join Date: Mar 2004
Location: Western Wisconsin (almost Minnesota)
oh, and, doh, I'm driving it with your average commercial 5.1 solid state receiver...
  Reply With Quote
Old 14th September 2004, 03:12 AM   #3
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Interesting! You are the first person I am aware of that has felt it needed some BSC. Anyway, yes, I would try a Zobel. Just using the published specs/plot, I get 5.625 ohms/5.053 uF to reactance annul Re (assumes 4.5 ohms). Really, with a Zobel, you may not feel the need for any BSC.

Anyway, please let us know the results and what you wound up using.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 14th September 2004, 05:27 AM   #4
tcpip is offline tcpip  India
diyAudio Member
 
Join Date: Jan 2003
Location: Mumbai, India
Default What are those RL combinations for?

Newbie question: the Jordan Website has recommendations of RL pairs to use with the JX92S in their standard boxes. These, I thought, were to strengthen the bottom end. Are these for BSC purposes?
  Reply With Quote
Old 14th September 2004, 06:53 AM   #5
navin is offline navin  India
diyAudio Member
 
navin's Avatar
 
Join Date: Jan 2002
Location: Mumbai (Bombay), India
Send a message via MSN to navin Send a message via Yahoo to navin
hey TCPIP what box did you build for your JX92?
__________________
...still looking for the holy grail.
  Reply With Quote
Old 14th September 2004, 03:47 PM   #6
diyAudio Member
 
Timn8ter's Avatar
 
Join Date: Jul 2003
Location: Seattle, WA
Quote:
I'm driving it with your average commercial 5.1 solid state receiver.
Could we be seeing the difference between voltage and current source and/or a damping factor contribution?
  Reply With Quote
Old 14th September 2004, 06:47 PM   #7
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Default Re: What are those RL combinations for?

Quote:
Originally posted by tcpip
Newbie question: the Jordan Website has recommendations of RL pairs to use with the JX92S in their standard boxes. These, I thought, were to strengthen the bottom end. Are these for BSC purposes?
Yes, though different values may be required for your app.

Quote:
Originally posted by Timn8ter

Could we be seeing the difference between voltage and current source and/or a damping factor contribution?
AFAIK, all the other folks who have built the various ML-TLs are using SS, and while it's possible the receiver is 'laying down' if it's not rated for < a nominal 8 ohm load, I doubt it. Regardless, a Zobel and/or series resistor should remedy the problem.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 24th September 2004, 01:53 PM   #8
tcpip is offline tcpip  India
diyAudio Member
 
Join Date: Jan 2003
Location: Mumbai, India
Quote:
Originally posted by navin
hey TCPIP what box did you build for your JX92?
Ordinary ported box, a little less than 18" tall on the outside. This is from the Jordan Website. I haven't tried GM's MLTL yet, though he had posted some of those details on this Website in response to one of my questions. GM and 7V had both been very helpful and encouraging. But I've since got caught up in another project.
  Reply With Quote
Old 24th September 2004, 01:54 PM   #9
tcpip is offline tcpip  India
diyAudio Member
 
Join Date: Jan 2003
Location: Mumbai, India
Default Re: Re: What are those RL combinations for?

Quote:
Originally posted by GM
Yes, though different values may be required for your app.
Okay, thanks. Will try it out and listen... haven't fitted any BSC on my ported box, and the sound does sound thin half the time.
  Reply With Quote
Old 24th September 2004, 03:26 PM   #10
diyAudio Member
 
cheesehead's Avatar
 
Join Date: Mar 2004
Location: Western Wisconsin (almost Minnesota)
Default Preliminary report on Zobel/BSC - Icky, icky

Quote:
Originally posted by GM
Interesting! You are the first person I am aware of that has felt it needed some BSC. Anyway, yes, I would try a Zobel. Just using the published specs/plot, I get 5.625 ohms/5.053 uF to reactance annul Re (assumes 4.5 ohms). Really, with a Zobel, you may not feel the need for any BSC.

Anyway, please let us know the results and what you wound up using.

GM
Preliminary report - I used this Zobel & a parallel 1.2 mH/2.5 ohm resistor for BSC. Yuck! Sounds muddy, boomy, like I put the speakers inside of a cardboard box. High end treble gone? I've gotta get a mic & preamp & start measuring frequency.

FWIW, I also included a driver brace as recommended in the original thread.

Of course, I put the zobel & BSC inside of the box, since I was "finishing" it . (They now they look great, just sound awful) This weekend I'm going to pull it out, re-stuff, and try the darned thing again, but with just zobel, just BSC (and do them external), just driver brace... the way I should have.
  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
Looking for Jordan JX92S oshifis Swap Meet 5 28th December 2013 12:26 AM
Jordan JX92S's for sale steve jones Swap Meet 4 19th October 2006 03:12 PM
FS Jordan JX92S JohnnyBoy Swap Meet 0 17th October 2006 10:58 PM
Jordan JX92S Gaffer74 Full Range 11 31st May 2006 09:42 PM
jordan jx92s TL box pstephenson Full Range 3 26th October 2004 12:56 PM


New To Site? Need Help?

All times are GMT. The time now is 07:15 AM.


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