This is the reason, I refuse to rehearse in a shared space. My band currently rehearses in a facility where all the gear is provided. There is a Gretsch drum set, Fender and Marshall guitar amps, Ampeg SVT head and 810 cab, Korg Triton keyboard and a full PA. The cost is $20 per hour. All I do is bring my bass.
That's the way forward, if you wanted to bring your own rig to check out, not be a problem? just like here I expect.
I think it builds more of a community among local musicians as they often meet up on rehearsal session finish and starts.
I don't hold with those spaces where more than one band rehearses at the same time, in different rooms, as there never seems to be enough sound insulation to make that idea really work.
Also in my rehearsal room there is a monitor system comprising of six 15" drivers, eight 12" drivers, two 10" drivers and 6 x 2" horns, 4 x 1"
horns and 4 x Hf bullets all controlled by a JBL active system controller.
Its got racks of crown amps and all this is time aligned and EQ'd with audio spectrometers and your rehearsal console settings are saved in Protools.
+ the room is acoustically treated with wide band absorbers and 720 cu ft of bass traps.
What does that all mean? it means that you can actually hear what people are singing! now there's a first!!

, also we have the advantage of being able to show your guitarist on a meter, exactly how much louder he has decided to be playing in the same room than say Olly the lead guitarist of Extreme Noise Terror or Paul Allender of Cradle of Filth.
If you keep turning up to rehearse with an SVT IIP controlled rig with settings left on it by a god of metal, the chances are you might begin to notice that he seems to be playing with a heck of a lot more midrange and a lot less bass than your average smiley face bedroom EQ choice.
It's amazing what young bands can learn if they get to work with lots of people that really know what they are about.
