Yes, use a TRS-TRS cable; you have the concept exactly correct. You can find an illustration in the T1 ToneMatch Audio Engine section of the Bose Professional Portable PA Encyclopedia at this page. Just substitute your Model II (using the ToneMatch cable) for the Compact (which uses a TRS cable.) Also, you obviously won't need the second T1 power supply pictured, since power is supplied from the Model II via the ToneMatch cable.