Headrush 108 user here and with
@WKSmith 's amazing Para EQ settings (search off his user name for the thread - I think its called Flattening the HeadRush Curve) - its made them totally useable - I have 2 so plenty of Stereo Goodness to get lost in and they are LOUD!! like drown out the drummer type loud if you need them to be - I use as foldback monitors for the full-on FOH large stage gigs I do - mainly for a bit of feel (and feedback!)and backup to my IEM's. I can also turn them around and use them as trad backline if required.
Great bits of kit.
As an FYI, I have a few real amps (MKV Mesa, 5153, Shiva) that have essentially been replaced by the modelling on the FM3 and the sheer portability and power of these little 108's.