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MT Audio Design XO-2001 crossover
MT Audio Design XO-2001 crossover
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Old 12th August 2017, 05:11 PM   #11
esl 63 is offline esl 63
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Join Date: Aug 2010
Go to following link:

Homepage MT Audio Design
On the left and down side, press "MT Audio kits" then you press the blue button XO-2001 and there you have all information on how it was designed.
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Old 12th August 2017, 06:57 PM   #12
Davey is offline Davey  United States
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Location: Bremerton, WA.
One of the NHT X1/2 units has similar functionality. (You might find one of those cheap.)
It has 2nd-order slopes vice 4th-order, and is missing the shelving function. However, the shelving function could be incorporated into one of the existing op-amp stages.

Just a thought.

Dave.
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Old 12th August 2017, 08:24 PM   #13
355F1 is offline 355F1  United States
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The dipole compensation is a high pass filter with crossover at 12 Hz (?) and then amplified to match the high pass QUAD section. I do not know what this means.

Do not skip the >subsonic switch<, its important to protect the woofer drivers that cannot take the very long excursions that can happen at subsonic frequencies. Will a DSP have this?

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. I too do not like log pots, linear pots can be simply modified with resistors to behave similarly to a log pot.

Volt stabilization is two 78xx ICs.
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Old 12th August 2017, 09:37 PM   #14
esl 63 is offline esl 63
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Dipole compensation is a simple RC 6dB filter with -3dB point at 12Hz (a capacitor to ground).
Since the signal out from a filter like this is attenuated quite a lot at 100Hz you have to amplify the signal.
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Old 13th August 2017, 07:16 PM   #15
anji12305 is offline anji12305  United States
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Quote:
Originally Posted by 355F1 View Post
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.
I've owned and sold this setup. Unless you're using the highpass function to drive your ESL63 (which I don't recommend) the DSPeaker 2.0 is audibly superior and offers some measure of room correction.

DSPeaker-Anti-Mode 2.0 Dual Core
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Old 13th August 2017, 10:57 PM   #16
355F1 is offline 355F1  United States
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Great, do you still have the QUADS and, if so, how do you have it connected? I regret but I know nothing about digital stuff. Also, what subwoofer are you using and what's your set up?

Thank you so very much in advance for your help.

Horacio
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Old 14th August 2017, 02:04 AM   #17
anji12305 is offline anji12305  United States
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Quote:
Originally Posted by 355F1 View Post
Great, do you still have the QUADS and, if so, how do you have it connected? I regret but I know nothing about digital stuff. Also, what subwoofer are you using and what's your set up?

Thank you so very much in advance for your help.

Horacio
I ran my Quads full range - without additional processing from my preamp. Both the preamp and DSPeaker 2.0 were fed a (split) optical input signal.

The DSPeaker drove a separate amplifier for the Gradient subs (which integrated poorly in my room) and later IB subs which had smoother and slightly deeper response.

I have since sold the Quads and Gradient subs to use higher efficiency drivers. I still use the DSPeaker to drive subs.

It's a terrific device. I recommend it below 300 Hz, only. As a full range preamp, it was a step backward in resolution.
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Old 14th August 2017, 01:13 PM   #18
esl 63 is offline esl 63
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Using XO 2001 for the QUADīs gives you approx 10dB more headroom. Since you cut away the low frequencies the get much more dynamic and the midrange (which is among the wery best if not THE best) really get another dimension. I did a modifikation on XO 2001 and changed the crossower frequency from 100Hz to 150Hz and I can play extremely loud! Something that you really donīt expect when you have electrostatic speakers. I would say the that you gain in resolution, dynamics, 3D, BASS for sure, and pure volume.
I hope someone makes a clone :-) maybe with some new fancy OP-amp?
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Old 14th August 2017, 06:20 PM   #19
355F1 is offline 355F1  United States
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DSPeaker 2.0 costs $1,200 new or around $650/700 used, I cannot afford that.

esl 63: this is exactly my point, that the Do it Yourself 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. A long shot, I know.
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Old 14th August 2017, 11:40 PM   #20
anji12305 is offline anji12305  United States
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Quote:
Originally Posted by esl 63 View Post
Using XO 2001 for the QUADīs gives you approx 10dB more headroom. Since you cut away the low frequencies the get much more dynamic and the midrange (which is among the wery best if not THE best) really get another dimension. I did a modifikation on XO 2001 and changed the crossower frequency from 100Hz to 150Hz and I can play extremely loud! Something that you really donīt expect when you have electrostatic speakers. I would say the that you gain in resolution, dynamics, 3D, BASS for sure, and pure volume.
I hope someone makes a clone :-) maybe with some new fancy OP-amp?
My experience was that the ESL63 may have presented less demand on the amp, but the output was veiled. In my opinion, it was not an improvement.

While this dedicated unit provided proper EQ for the (dipole) Gradient subs, it sounded no better (or worse) than commonly available sub crossovers.

I would look to the NHT crossover mentioned earlier before sinking time into orphaned designs.

Is the DSPeaker expensive? Certainly.
It has also cleaned up the presentation in my little music corner.
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