I've been a user of E-450 in the past, now it's a totally different level. I'd say E-450 is good for an aera ~ 150-200 ft and I've tried several times that it's a little bit out of control when I turned the volume to ~ 12 o'clock level.
C-290 + P-700 had a very similar characteristics to E-450 but more detail, more power yet preserve the sweetness of C-290