I use a cable that has 2 1/4 inch jacks on one end and rca's on the other. I put the rcas into a plug that converts them back to 1/4 inch and plug that into the 1/4 inch jack of the Bose. This satisfies my needs.

Joe
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PSR S950, PSR S900, Roland RD 700, Yamaha C3 6'Grand, Sennheiser E 935 mic, several recording mics including a Neuman U 87, Bose L1 Compact, Roland VS 2480 24 Track Recorder
Joe Ayala