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Old 13th May 2002, 07:13 PM   #1
diyAudio Member
Join Date: May 2002
Location: Glen Head, NY
Default For Sale

Selling two Welborne Labs Active Crossover Kits:

Act 5, unbalanced 4th-order 3-way crossover kit with level controls. XO frequencies 90 Hz and 480 Hz. This kit is completely assembled. Can also be used as a 2-way XO by removing selected modules. Original cost $1382.50. Asking $450.00

Act6, unbalanced 4th-order 3-way crossover kit without level controls. XO frequencies 90 Hz and 480 Hz. This kit is not assembled--in original packaging, unopened. Original cost $1154.50. Asking $350.00
Old 13th May 2002, 09:39 PM   #2
diyAudio Member
Join Date: Dec 2001
Location: Austin, TX

How do we contact you?
What configuration are the crossovers?

Can we change the Q? Any other information?

Thanks in advance!

doing my part to Keep Austin Wierd.
Old 14th May 2002, 03:26 AM   #3
diyAudio Member
Join Date: May 2002
Location: Glen Head, NY
You can email me at (My email has been down for the past few hours, but should be OK now.)

These crossovers use fourth-order Butterworth filters, 24 dB. I don't think you can change the Q. The XOs were designed by Jean-Claude Gaertner and Erno Borbely, using Class A discrete buffers--essentially a discrete version of an op amp. Both of these kits were ordered in 1996. The assembled one (Act 5) is mine. (It took many hours to complete it.) I bought it for use with a ESL I had constructed, but shortly thereafter bought an Eros ESL from Roger Sanders, so the crossover has actually been used only a few days.

The second crossover (ACT6), w/o level controls, is still in its unopened box. It was bought by a friend of mine who had a similar experience.

Both of these come with complete instruction manuals.

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