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

Planars & Exotics ESL's, planars, and alternative technologies

MT Audio Design XO-2001 crossover
MT Audio Design XO-2001 crossover
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 4th August 2017, 03:54 PM   #1
355F1 is offline 355F1  United States
diyAudio Member
 
Join Date: Mar 2008
Location: Pinecrest, FL
Smile MT Audio Design XO-2001 crossover

Has anyone ever built a copy of an MT Audio Design XO-2001 crossover?

It was made in Sweden by Matts Tornqvist but is no longer available, the perfect crossover for the QUAD ESL-63/Gradient SW-63 set up.

I do not have the schematic but there are seven ICs in the subwoofer section and two in the main ELS section.

It has many useful functions, two of which are: a pot for setting subwoofer volume level and another (a delay circuit) for phase shifting the sub. A very elegant and noticable function.
  Reply With Quote
Old 7th August 2017, 12:00 PM   #2
esl 63 is offline esl 63
diyAudio Member
 
Join Date: Aug 2010
Ask him for the schematics. I have that crossover and it works wery well!

Homepage MT Audio Design
  Reply With Quote
Old 7th August 2017, 03:47 PM   #3
355F1 is offline 355F1  United States
diyAudio Member
 
Join Date: Mar 2008
Location: Pinecrest, FL
I already did in the past and offered to pay for it but Mats said no. I posted this topic with the hope that the DIY audio community may be able to find a genius to recreate Mats' printed circuit board so that it can be built, before its complete demise.

The XO-2001 is far more superior to the Gradient crossover.
  Reply With Quote
Old 11th August 2017, 05:12 PM   #4
esl 63 is offline esl 63
diyAudio Member
 
Join Date: Aug 2010
Iīll will go wisit him.
I got the schematic but i canīt and will not publish it of course. But i will ask him..
  Reply With Quote
Old 11th August 2017, 06:25 PM   #5
355F1 is offline 355F1  United States
diyAudio Member
 
Join Date: Mar 2008
Location: Pinecrest, FL
Thank you for your assistance.
  Reply With Quote
Old 11th August 2017, 07:04 PM   #6
355F1 is offline 355F1  United States
diyAudio Member
 
Join Date: Mar 2008
Location: Pinecrest, FL
I am building Mats' Gradient SW-63 look alike dipole subwoofer.
  Reply With Quote
Old 12th August 2017, 03:18 PM   #7
Davey is offline Davey  United States
Sin Bin
 
Join Date: Dec 2001
Location: Bremerton, WA.
The block diagram of that unit looks very straightforward and it's obviously implemented with an op-amp scheme.
I can't imagine there is anything innovative or proprietary to the point of being a big secret.
I have constructed similar active/EQ's a number of times.

Is a DSP unit out of the question?? The type of implementation the XO-2001 appears to have is easily done with a DSP unit in just a few minutes.

Dave.
  Reply With Quote
Old 12th August 2017, 03:58 PM   #8
355F1 is offline 355F1  United States
diyAudio Member
 
Join Date: Mar 2008
Location: Pinecrest, FL
Dave, I understand your point but ESL63 is not the owner of the schematic and he is correct not publicly disclosing it.

A friend of mine with an ESL63-Gradient SW-63 set up and whose ears I trust compared the XO-2001 with a mini DSP and also with the original Gradient crossover. The XO-2001 performed best in his system. I also have QUADS.

Horacio
  Reply With Quote
Old 12th August 2017, 05:01 PM   #9
Davey is offline Davey  United States
Sin Bin
 
Join Date: Dec 2001
Location: Bremerton, WA.
I didn't suggest that he disclose it. But possibly he might hint/suggest to Mats' that Mats' disclose it. If not, that's certainly fine....but then it's just a mystery and warrants no further discussion.

I don't know what "performed best" means, (subjective evaluation I guess) but would suggest that if there was a noticable audible difference then probably the Gradient and miniDSP crossovers were not set up to exactly duplicate the transfer function of the XO-2001 unit.

Cheers,

Dave.
  Reply With Quote
Old 12th August 2017, 05:55 PM   #10
esl 63 is offline esl 63
diyAudio Member
 
Join Date: Aug 2010
I just talked to Mats.
If you look at the block schematic itīs pretty straight forward, Op based Linkwitz 24dB filters 100Hz crossover frequency.
The dipole compensation is a high pass filter with crossower at 12Hz and then amplified to match the high pass QUAD section.
There is a switch for subsonic but you can skip that part.
The delay adjustment is an all pass R/C filter with a potentiometer, Mats is using a linear pot but that was a mistake! Use a LOG potentiometer instead! Itīs quite difficult to adjust the delay with the linear pot...

Voltage stabilisation of course +/- 15-18 volts depending on OP amps.
There is not many secrets. Double sided circuit board.
  Reply With Quote

Reply


MT Audio Design XO-2001 crossoverHide 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
MT Audio Design XO-2001 crossover 355F1 Solid State 0 4th August 2017 03:39 PM
MT Audio Design XO-2001 WANTED 355F1 Swap Meet 1 19th July 2017 05:49 PM
Can you use a digital active crossover to design a passive analog crossover ? RickDangerous Digital Line Level 27 1st April 2013 06:59 AM
Ashly XR-2001 Crossover sbrtoy Swap Meet 2 27th April 2012 09:55 PM
looking for TAD 2001 Gluca Swap Meet 4 20th May 2011 03:32 PM


New To Site? Need Help?

All times are GMT. The time now is 01:44 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki