This is Geert Meddens' Contrapunct dipole subwoofer crossover.
http://www.meddens.eu/audio/images/sub63_scheme_v2.jpg
http://www.meddens.eu/audio/images/sub63_scheme_v2.jpg
Geert Meddens circuit has a nice twist since it is a Chebyshev filter in the HP for the Subwoofer with approx 3 dB gain around 20 Hz before it falls of steeper than usual. I think the crossower frequency is -3dB at 16 Hz.
So if you go analogue this is a nice alternative to MT-Audio.
In the digital domain you can do lot of magic of course.
So if you go analogue this is a nice alternative to MT-Audio.
In the digital domain you can do lot of magic of course.
Even though I always say a system today without a DSP is just plain crazy.... at the very least, you could use something as easily adjusted as Behringer DCX2496 to mock-up by hearing tests the slopes and points, and delays, and EQ, and......
and then attempt by duplication to buy and certify and test (and then expensively try to modify and re-modify) the components in your final system.*
B.
*of just leave the DSP in place
This makes no sense to me: "high pass in the subwoofer"? To pass low frequencies to the subs need a low-pass filter.
Open baffle needs 6dB/Octave boost: if you crossover at 100 then 6dB boost means four times the power at 50 Hz. Eight times the power at 25 Hz. Sixteen times the power at 12Hz.
I do not see why the uneven response of Chebyshev filters are unpopular in LF audio. Speaker impedance varies with a lot with frequency, as does Chebychev filters.
I know this post is old, but it's what comes up in a search for MT Audio Design XO-2001 now that the company website is gone. Does anyone have the specs on the power supply for the MT Audio Design XO-2001 crossover? Someone offered me one without a power supply. I just acquired Gradient sub-woofers to go with my Quad ESL63s and I'm running them with a Behringer digital crossover. It seems like the MT crossover and the Gradient box are more elegant solutions. The Behringer requires 4 balanced output cables or adapters. Thanks if anyone is listening.
Thank you very much! So something like this? Seems like higher voltage brings higher amps along in generic wall warts.
- US Adapter,Input Voltage : AC 100-240V,50-60Hz (Worldwide AC Input)
- Output : 18V 1.5A/1500mA Max (Also Compatible with 1000mA or lower device)
I recently acquired the Gradient subs to add to my Quads and it was supplied with a Behringer DCX2496 instead of any other crossover. By a stroke of luck (I think) somehow I'm awaiting shipment of an original Gradient box AND an MT -XO2001. I thought the Quad/Gradient sounded spectacular when set up with a crossover of 109hz (it skips 110hz). I tried some higher crossovers and the sound got muddier as it went higher. I know that there's a 'cult of Walker' that trusts the original Quad designs over improvements so I think I'll trust that crossover of 100-110 for now. Didn't the Gradients get the Quad stamp of approval?
Hooray. Pretty simple, eh.
No other sensible way to manage a sub with adequately steep slopes to keep low notes out of the mid-range speakers.
B.
My MT Audio Design XO2001 crossover just came back from being tested and checked out at a repair shop. The technician discovered a detached ground wire that was causing hum, and now it's operating properly. I have to say that compared to the Behringer crossover, the sound in the highs is clearer and sounds more like the Quads without the subs. Setting the bass level will take some experimentation, but it's soooooo easy to adjust.
