In another thread, I ask about a solid fully wireless stereo set of amplified speakers with built in wireless music streaming for the road warrior to use in his hotel room. All wireless is idea for easy set up and tear down (just turn them off and thrown in your suitcase).But, if these are mostly going to be used in a hotel room, there really is no reason for wireless between the source and the speakers, nor wireless to connect a pair of stereo speakers. I'd rather have that space, weight, and cost used for better amp and drivers than a big battery.
In another thread, there was a discussion of inexpensive audio amplifiers (under $20) that you must have missed. Just for grins I obtained several. The one that seemed to have the most going for it had both Bluetooth and 3.5 mm stereo jack inputs, so I hooked it up and tried it. The things are sold without power supplies but mine actually is plug and play with the cord brick from an old long-discarded laptop. You can buy these on eBay for under $10. So there is your solution - $15 for the amp, and another $8 or so for the power supply. If the measurements for the chips that this thing is based on and my casual listening evaluations are representative, it lacks audible problems other than a modest turn-on, turn-off transient. Now here is a repeat of the punch line. It has both 3.5 mm standard miniature stereo phone jack and Bluetooth inputs. Wiring is optional but supported. If you pick the wireless option, you can set up the speakers and amp where they are convenient, and then wirelessly play your music using your cell phone via BlueTooth. You can use wirelss sources or you can hook up gigabytes or terrabytes of storage to or even in the cell phone. Or, if you really gotta have the audiophile security blanket of wired operation, you can get a 6-10' long 3.5 mm extension cable for about $10 more. It all works.BTW if the prices I mentioned are too cheap for some audiophile sensibilities, I can tell you how to pay much, much more but I don't think I can tell you how to get something that actually sounds better.
BTW if the prices I mentioned are too cheap for some audiophile sensibilities, I can tell you how to pay much, much more but I don't think I can tell you how to get something that actually sounds better.