I bought this pair end of 2010 direct from factory. I used it with my B&W 802D2's in monoblock configuration. These are not hardwired for mono operation so you have a choice to use as stereo (bi-amping) or mono configuration. These amps have worked flawlessly for me and selling these because recently I upgraded to class A amplifiers costing a lot more. I will include a pair of Belden 83803 shielded cables and a pair of XLR split cables for free if my asking price is paid. Buyer responsible for paying shipping and paypal fees.