Should be ok to crank it up.It memory serves me the 801 could handle 600 rms.That said I mioght consider saving up my shekels and going for a used Nautilus set up.$3K is a lot ofmr a used 803 but will blow away the Matrix series in mids and highs.Owned a 802 III and new 803 blows it doors.New stuff has gone through roof.Old price on 803N is $500 more at $5500 and now they have a $8K model which while not getting as low has a diamond tweeter.Haven't heard it but my old boss (I used tgo sell B&W) say's it's a better value than the previous $8K 802 just a bit less bass.If going with any of the Matrix B&W Sound Andchors are a must especially with wood floors but even concrete.You like B&W's house sound and unless you are a total bass freak save up for better product.I heard and 803 with a good sub (10" Velodyne HGS at $1750 and it was nivrvana.Can't imagine what a 12" to 18" Velodyne of same series would sound like or with an REL or the budget delight Vandersteeen but you only miss the last octave or so.But with that amp and the 801 you can recreate symphonic music very if not with the latest level of resolution.
G'luck
Chazz
G'luck
Chazz