As someone playing in 3 different big bands (2 regular 1 sub) I can speak to needing a lot of volume.Also, related to whether vibration is an issue, I always amazed at the amount of volume that some people need. My needs are much more moderate. Last week I played a couple of shows with a big band - the music of Johnny Richards. Huge sound with 13 horns including tuba, bass sax and lots of fff written in the parts. Very boisterous at times. I had my GR 110 dialed in at no more than 25% (I did have sound coming through FoH too). The idea of ever needing anything more than 1x10 (I played with a 1x8 for the last 8 years) is baffling to me so my feeling is that at least in terms of pushing the cab, what I put through it is only a fraction of its capability.
Ideally yes....especially having 2 DI's in the Felix...I would send to FOH. It works great with one band who lets me do that.
THe MAIN one that gigs 2x a month has a great huge sound system and refuses to let me send a line out. I've run into that at a few places. I don't get it. Instead the pianist who has drums directly between me and him struggles to hear me (rest of the band has no problems and the sound is good out front from what I heard on a recording) and I can't really push any louder. Doesn't seem fair for the bassist to be trying to fill a huge room with a 1 x 12 Cabinet!
May have found a compromise he has an XLR in channel on his keyboard amp I told him next time I'll throw him a line and he liked that idea.