DMX Music Service (aka DMX for Business, DMX Direct, DMX/DBS) is on Ku-band satellite:
Intelsat Americas 6 (formerly Telstar 6 / T6) transponder 25, 12146 MHz, vertical polarization.
It can be received with a ComStream DR200 digital audio receiver, or Antex DR500 or DR501 receiver.

DMX was previously on Telstar 4 (T4), but moved following that satellite's failure.

DMX Music list of channels