So, after 10 days or so, I am generally very happy with the new Bose. I must say however that I am unable to connect both the L and the R output from the Pa900 into the Bose without problems.

If I connect into the RCA inputs using instrument cables and adapters I get a hum as early as 9-10 o'clock.

If I connect into the Line input using an adapter I cannot get the mic to come through, only the keyboard. That is a weird one!

Frankly, I am not too worried, since I have found the difference to be pretty small, and I am happy with the single cable connection, but you guys have recommended the two cable approach so I thought I would try it. Any ideas?