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This is why a bassist should study the specifications of the guitarist tube amp so they know which tubes they can remove to make it quieter but still functional. Or invest in some of those power tube substitutes which only have 1W output :).

I'd look at dB not Watts. My current rig (300W amp into a 4 ohm 1x15 of nominal 97dB sensitivity with pretty flat EQ) seems to do the job for a pub without any issues. That's nominally about 120dB maximum at 1m, not that I've tested what it is delivering during a gig, but presumably less. Boosting the bass sucks power, so avoid all the low notes if you can't be heard From experience, being just around 3dB too quiet can mean you vanish from the mix. In theory, getting other musicians to turn down can help provided you aren't required to play at levels that will permanently damage the hearing of the audience, but isn't always easy to persuade others of the virtue of. When I did sound for bands the comment I tended to get was that the mix was great but too quiet...

I was looking at this as something roughly FRFR would be quite flexible for multiple instruments, but it looks a lot less ugly than using a Headrush or Alto TS series. But 85dB or even 95dB maximum isn't much good for live work. I was doing some frequency sweep testing of my gear in the living room and hitting 95dB. My current single cabinet rig (Warwick Profet 3.3 into a Tech 1x15) theoretically tops out at about 120dB (I've never tested it that loud with the SPL meter) and that seems about right for small to medium gigs without PA support for bass. The Spark would be more FRFR than my ancient Trace Elliot 60W Boxer with a 12" speaker I have for jam sessions, but quieter. I haven't tested my tiny Kinsman amp for acoustic guitar with an SPL meter. It would mean the Spark might only be of use for stage monitoring and given the increasing prevalence of IEMs, would it be of use there? If it could manage ~100 to 110 dB each I might consider a pair. But thanks, I'll pass as for quiet gigs that 85dB might work for, 54dB of idle noise would then be a deal breaker. I'm at a PA/bass decision point as my PA amp is an 800W RMS lead sled that is heavy, much more so than the Warwick bass amps, although I also have an Ashdown class D but I'm very used to the sound of the Warwicks. I could either swap that out for class D or get something like a pair of Alto TS or TX. But I'd get pennies for the existing passive speakers. But I tried those for bass and acoustic guitar with the Warwick and they sound pretty good. So in theory, I could replace the 1x15 cabs with the PA speakers (similar weight, slightly bass response and SPL, but could be lived with) but PA speakers look ugly! The resale value of the bass cabs is better. New year, new ideas, etc.