I use an M.J. Acoustics Reference 100 bass box in my studio at home ( http://www.mjacoustics.co.uk/MJ_Acoustics/Product_Archive/Ref_100.htm ) and it certainly enhances the bass performance of the KN7000. However, it's a bit heavy to take on gigs and I prefer to use my Bose L1 Compact which in conjunction with the KN7000, produces a superb sound.
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Willum

After silence, that which comes nearest to expressing the inexpressible is Music.
Aldous Huxley
( especially when the music is played on a KN7000....)