While I can say that I have enjoyed the rush that playing a big amp backline can give as a bass player in my youth, you will pay eventually for that kind of fun. I'm 52 and lucky that my tinnitus is pretty mild when compared to the hurt that some of my peers have suffered. A good drummer, and friend of mine had to give up playing for good because his tinnitus is that severe. He's not my only friend and peer to have tinnitus bad enough to impact their music careers. The band I'm in now can still get good and loud but we play to the size of the venue, pack our earplugs, and both guitarists have gone to smaller combo amps, leaving the Marshall stack mentality behind. I also like the fact that I can do most of our gigs with my single 15 Ampeg combo amp these days. It's fun to be loud when you are young, but all of those decibel level warnings that some amp gear makers used to have stamped on the back panel of their amp heads were quite truthful.
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You young guys might want to check out Pete Townsend youtube comments on his hearing loss. I believe the drummer from Metallica has similar advise.
Anyhoo, I play w/ a 100 watt Ampeg V4b and a 1x15 and with the guys I play with and the music I play its been more than enough. We certainly hope at some point to have enough PA gear to be able to mic everything and thereby keep our stage volume to 90-95dcbls.
My typical Rig if I am in a "Sunn" mood is 2 Sunn Coliseum amps, a lead and a bass and my Sunn Model T and Sunn concert bass amp into 3 Sunn 215 cabinets all with JBL K-140's, and 2 SWR Goliath III 4 X 10" cabinets. Not loud? If I am into a JPJ mood I smack 'em upside da heads with my 