Bryston 10B Sub Electronic Crossover XLR

Immaculate Condition.  Original Box.
This is an XLR version.
From Bryston:
10B-SUB Electronic Crossover
The Bryson 10B-SUB Electronic Crossover is designed to be an ideal signal-handler with enormously flexible control functions. The 10B-STD facilitates the implementation of bi-amp’d and tri-amp’d systems with a precisely tailored response. 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 or RCA single ended* Outputs: XLR balanced or RCA single ended* 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
Features: 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) Options: XLR balanced or RCA single ended inputs and outputs *Can only have XLR or RCA, both combined are not available.