Hi Scott,
As you know I own the 450's since more than a year and they still impress me very much.

Balanced/unbalanced is absolutely NO problem ...just take the right cable :
6.3 mm jack TIP to nr. 2 of XLR
6.3 mm jack GRND to nr. 1 and 3 of XLR

Last summer we did an 'open air' gig and the audiance was >4000 people... the only speaker that was too 'short' was my home made 350W sublow cabinet
I expect you have to loosen the clamp for the pipe. (the knob on the back of the SRM)
The hole itself is standard and will fit.

Roel




[This message has been edited by Roel (edited 12-01-2001).]