I am new in this forum. Not too much experience and knowledge in music. I am interested in knowing where to buy this unit. I read a sale price of $910.
Is this unit comes in 2,3,4,0r 6 channels? What type of cables are needed? I have the virtual dynamics, heavy cables.
Thanks 
Welcome to our forum!
The $910 price is not available anymore. The person offering that price raised it shortly after offering it because B&O does not permit selling their amp modules direct to public as a kit. He has since left our forum.
1200AS modules are manufactured by B&O as either a 1 channel (1200AS) or 2 channel module (1200AS2.)
The amp is internally fully balanced so it can make best use of a balanced signal which uses an XLR connector and cables. But it sounds equally good using a single ended signal, which uses an RCA jack and RCA cables.
Any finished amplifier built using this amp module will have XLR input connectors. It might also have RCA input connectors, but if not you can use a XLR>RCA adapter. Neutrik makes a good adapter, available from Mouser.com.
It is an excellent amplifier. I have one and I highly recommend it.
Another similarly excellent amp module to consider (if you like a slightly warmer sound) is NCore NC502.
I believe
Nord makes amplifiers from both of these modules.
Rich
