ICEpower1200AS2 single ended subwoofer amp with miniDSP 2X4

I’ve built Ripols with 2 x 12” 8 ohm Dayton woofers. I believe that 1200AS2 should give enough power into 4 ohm. I want to use Mini DSP 2X4 with them as I have not built the crossovers. I have a balanced preamp and I want to implement the following setup:

Pre->MiniDSP-> 1200AS2-> Ripols.

I’m not sure if I can run 1200AS2 with single ended input, also, 2X4 mini DSP has 0.9 V output which is not enough for 1200 AS. I can get 2X4 mini DSP balanced that will solve the problem with the input but it’s output is only 2V so it is probably still not enough. Are there inexpensive buffers that I can use with ICE1200AS ?