You can use the ToneMatch T4s digital mixer with a stand-alone power supply and connect to any powered speaker system, not JUST the S1 Pro+ or any of the Bose Pro range.
But utilising the included ToneMatch cable and connecting to an L1 Pro8, Pro16 or Pro32, you can power the T4s without a secondary power supply, and there’s no need for an audio cable between the L1 Pro and T4s either.
Read the full step-by-step guide on how to connect your ToneMatch T4s mixer with the L1 Pro range in mono, dual mono, or stereo.