Bryston 10B-Sub Balanced Active Crossover

I purchased this unit after reading Stereophile's review in the November 2005 issue. I used it to integrate a JL subwoofer with Quad ESL 989 speakers, as described by Larry Greenhill in that review. Worked smoothly. I am reconfiguring my system now and no longer use the ESLs, thus the Bryston is now surplus to my requirements.
This unit was manufactured in November 2003. The remaining balance of the original 20 year manufacturer's warranty on analog products is transferable to the buyer of this unit. The serial number is shown in one of the photos should you wish to validate this with Bryston.
The owner's manual and product brochure are available for download from the Bryston web page for this product (http://www.bryston.com/products/other/10B-SUB.html).
The following is from the Bryston website :

The Bryston 10B-SUB Electronic Crossover is designed to be an ideal signal-handler with enormously flexible control functions. It can also be used to implement Linkwitz-Riley filters and (when special ordered with custom crossover points) it may also be used as both an infra-sonic and ultra-sonic active filters.

Inputs: XLR balanced
Outputs: XLR balanced
Selectable Frequencies: 40 Hz, 50 Hz, 60 Hz, 70 Hz, 80 Hz, 90 Hz, 100 Hz, 200 Hz, 250 Hz, 300 Hz, 400 Hz, 500 Hz

• Stereo 2-way
• Stereo 2-way summed low pass
• Monaural 3-way
• 1st, 2nd and 3rd order Butterworth filters in all modes
• 12 selectable crossover points for each filter
• One 11 step precision attenuator for each channel (in either low pass or high pass filter)
• 19” rack mountable faceplate (1U)