my 2 cents
in general, @tvad has nailed it, you can’t really assess or compare gear at shows... wayyy too many variables/unknowns - shows are fun to see the gear ’in the flesh’, meet people behind the gear, and at best, provide a very very rough screen to note what might sound good to you -- thinking is, if a room sounds particularly good at a show, they have achieved something pretty difficult, and it may be worth your pursuing what’s in it - noting the gear in the chain, the room situation AND the setup - the latter 2 are critical, esp. listening triangle...
specifically, to ’hear the sound of a streamer’ at a show? forget it... done right, you can barely hear the difference between competent streamers in the controlled environment of your home and even then, is it the cabling? power management? connection interface? signal feed? -- that said, you CAN see how well a streamer is built, if you like how it looks, and what software/controls are being used (important!), see if those may suit your fancy
