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Old 2nd December 2003, 01:16 AM   #1
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Default Tube crossover for sub?

Anyone have any ideas for making a tube crossover for usage with a sub? I would like to pass frequencies below 100hz only.


Joe
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Old 2nd December 2003, 02:54 AM   #2
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Joe,
Absolutely not a problem. You can use a tube in follower configuration and build a Sallen-Key filter around it (the cathode is the + input). More elaborate topologies are possible, too, if you want to make a really fierce-looking circuit.
Try www.tubecad.com for some nifty tube crossovers or roll your own. The stuff in the Xenover thread can be adapted, although it might be easier to visualize with the stuff I put in the earlier crossover thread a year or two ago, as I was using followers to illustrate the S-K hookup.

Grey
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Old 2nd December 2003, 10:02 AM   #3
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Joe, if its for <100Hz, especially if just low pass, then use opamps. The high pass you can adjust with a series cap in the amp if 6dB is enough.

If you want/need steeper slopes, then the tubecad article is fine, and John even sells some cheap software to design it.
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Old 2nd December 2003, 10:46 AM   #4
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Brett

I have had a 24db per octave low pass electronic crossover in place for the last 15 or so years. Since I'm into tubes now it seems like Blasphemy to even consider using it now.

GRollis

Thanks for the link. I will give it a try and see what I can come up with.


Joe
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Old 2nd December 2003, 10:50 AM   #5
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Quote:
Originally posted by burnedfingers
Brett

I have had a 24db per octave low pass electronic crossover in place for the last 15 or so years. Since I'm into tubes now it seems like Blasphemy to even consider using it now.
So, I'm hardly Mr Sandamp, and I use them there. It still works really well. Just don't run the high pass signal through it.

Sand has it's places, and <100Hz is one of them.
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Old 2nd December 2003, 11:03 AM   #6
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Quote:

So, I'm hardly Mr Sandamp, and I use them there. It still works really well. Just don't run the high pass signal through it.

Sand has it's places, and <100Hz is one of them.

Thank you Brett for your opinion, however as I stated I already have a custom built crossover made with "sand components". To be exact it is a mono summing circuit followed by a 6th order 24db per octave high pass filter at 27hz followed by a 24db per octave low pass filter set at 80hz.

If I had wanted to continue using this I would. As stated in a prior post it is my intention to build a filter using a tube based design, Why? Because I want to.

Joe
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Old 2nd December 2003, 11:26 PM   #7
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Hi,

Hopefully this may help you, Joe:

http://www.marchandelec.com/xm26.htm

http://www.bonavolta.ch/hobby/en/audio/filter.htm

http://www.enjoythemusic.com/tubecros.htm

http://members.aol.com/sbench101/#Electronic

Cheers,
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Old 2nd December 2003, 11:52 PM   #8
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Thank you Frank



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Old 3rd December 2003, 05:47 AM   #9
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A few more tube XOs

http://www.t-linespeakers.org/tubes/xos.html

some of them are redrawn from the Enjoy the Music link.

dave
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Old 5th December 2003, 12:19 PM   #10
Kalle is offline Kalle  Sweden
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Hi Joe

Im a new member to this forum since 10 minutes! I just wish to say that im using a tube crossover for sub and it sounds lovely. It is US made but i cant tell the name of it since i am at work. It is old though guess made in the 60s. It has variable crossover from 0,01Hz to 2kHz by combine a couple of switches and two pots, one for low cut freq. and one for high cut freq.

Best regards
Kalle
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