DIY active crossover

[moamps]

I was thinking about MOX crossover, but that discrete opamp looks kinda funky. Not sure.... Did you tried that?

Hi!

Being the person who designed and published the MOX crossover, yes, I tried it. It works quite well.
There is a compact version with IC's out now (which I developed for prototyping purposes), which you can check out on my website (incl. schematics and all).

Regards,
Milan

 

[Moby]

Hi neighbour  Now I figured that you are member of this forum  I will try to build it, why not, design looks quite flexible. BTW, since I commented that op-amp looks kind funky to me, did you compared it with some chip op-amps, say LM4562. Or maybe with some other discrete op-amp?

 

[moamps]

...BTW, since I commented that op-amp looks kind funky to me, did you compared it with some chip op-amps, say LM4562. Or maybe with some other discrete op-amp?

Hello,

The "funky opamp" works in the SE class A and sonically outperforms all standard ICs (TL071, N5534 etc.) that I have tested so far. I haven't tested the LM4562 or tried any other discrete opamps.
BTW, discrete opamps usually have PP output pairs for driving high output current into long wires or output transformers. Here, in the MOX active crossover stages, "opamps" aren't loaded that heavily so there is really no need to go PP, in my opinion.

Regards,
Milan 

 

[Moby]

Cool, interesting "funky op-amp"  I agree, noo need to run 75ohm  N|BTW, do you have some available PCB'S?

 

[moamps]

Cool, interesting "funky op-amp"  I agree, noo need to run 75ohm  N|BTW, do you have some available PCB'S?

Sorry, I don't have any opamp PCBs. I may have some PCBs left for the current IC version that's on my website but I'd have to look through my drawers to be sure. You can drop me a PM.

Regards,
Milan

 

[Viitalahde]

Not wanting to highjack the topic, I began wondering where I had took the ideas for my ATC project:

This from an ATC SCM150 review. My drivers are a little bit different, but I think it's still a good starting point.

 

[Moby]

No way you are highjacking, this thread is pretty relaxed  Can we see the schematics you are talking about?

 

[Freq Band]

24dB crossover, 2 way.
http://sound.westhost.com/project09.htm
In my case used to crossover a sub and satellites.
I made the circuit adjustable by moving 12 jumpers.....
50, 60, 70, 80, or 90 Hz
Polystyrene caps !!
OPA2134

Not cased yet....although no noise even without shielding.....
http://i5.photobucket.com/albums/y177/Midiot/DIY/DSCN3607.jpg

http://i5.photobucket.com/albums/y177/Midiot/DIY/DSCN3613.jpg


=FB=

 

[Moby]

Looking great  I like the caps. How it sounds?

 

[mhelin]

This from an ATC SCM150 review. My drivers are a little bit different, but I think it's still a good starting point.

Regarding the analogue phase correction using Butterworth all-pass Bruno Putzeys wrote at his forum (at ProSoundWeb, http://recforums.prosoundweb.com/index.php/f/45/0/ don't have link to the post now) that he uses 4th order LR filters with inverted (phase response) all-pass FIR filter to correct the phase response at crossover region. Don't know if it's possible to do at all in analog domain.

Btw. There are some schematics of SCM100SL (the passive version) and other designs using SCM75-150 midrange at diyaudio.com:

http://www.diyaudio.com/forums/showthread.php?s=&threadid=122779
http://www.diyaudio.com/forums/showthread.php?s=&threadid=27135&highlight=