I’ve been eyeballing the Rumble line. One of these weekends we’ll make it to a bigger city that has a guitar store so I can try them out. Along with basses. 
Here, read this review:
I don’t know of any. It seems to me that combining functionality like that into a composite device would be a rather special-purpose thing. Simpler and cheaper (as you say) to use separate wireless connections into a mixer?
These dongles talk about “multi-point connection in RX”
so ???
Well, it sounds like a solution, from the description…I personally don’t vibe with bluetooth. Maybe I have too much iron in my blood or something, always unpairing and such, so I don’t trust it, and even less now that it by rights should be a very mature protocol.
Could work, but a simple line mixer (or even a small regular mixer by Mackie or Behringer, or Yamaha has some nice small mixers…I don’t know if I’d really try to push the inputs with gain, because of noise and all that, but they would have push button solo/mute buttons per channel, unlike the more typical volume pots or faders on the simpler line mixers)…just, simple, and more than adequate for the OP’s purpose.*
I’ll join in somewhat reluctantly on the bass guitar chatter: I have a nice little portable cabinet with a SICA 6L 1.5 SL 6.5" speaker…the designer of the cabinet has put all his eggs into his basket to ensure that this little speaker will handle the lowest tone of not only a 4-string regular bass guitar, but lowest tones of a doghouse bass as well as the lowest note produced by the pedalboard of a Hammond organ.
I use it with a TC Electronic BAM200 micro-amp, and have never had the slightest inkling of the speaker breaking up/distorting when using very low tones.
It’s a specialty product, putting the premium on ultra-portability for musicians who need lightweight, loud (for a small combo, including horns and drums, in a smaller venue), portable sound, but there are all kinds of things out there now that use speakers that would have been unthinkable maybe twenty years ago.
I use it on guitars and keyboards, and find it’s very nice, but particularly for a traditional “dark, thunky” jazz guitar tone. When I finally pull the trigger on a P-Bass (probably a Squier model of some sort), I won’t hesitate to use it through the same rig. My guitar stuff is in one room, and my keyboard stuff is in another, so it’s convenient to chuck it in another room, especially for keyboards, to get a quick stereo sound when combined with a much bigger powered monitor.
*But at the price of $0.00, according to the HAGiBis preview of the link, what has one got to lose?
Cables are better than Bluetooth, but, should one want wireless, (you should double-check, of course) the semi-good to good Hagibis dongles should support Low-Latency Bluetooth.
I’m not sure how well this would work as a guitar switcher? I can’t see any actual signal level specs in the info, but from context it looks as if it is intended to work with typical line level signals.
A guitar pickup is a lower-level output, so you might have significant noise floor issues?
Interesting. I’m sort of in the market for a decent portable bass rig (sold the old gear when I moved back to the UK from the US because of different voltages & I didn’t want to haul round a massive transformer).
I can believe that a long-throw 6.5 inch speaker plus cabinet combination can be tuned to give a decent response down to quite low frequencies, for studio monitors at least.
But what about efficiency and SPL? I find it hard to credit that a 6.5 inch speaker is capable of putting out enough bass to compete with a drum kit and, say, a 50 watt guitar combo in a live band?
Would love to be proved wrong… my old bass rig was a 100 pound monster!
I’ve heard a lot of good comments about the Fender Rumble. The 40W bass amp comes with a 10" speaker and weighs 20 lbs.
The Rumble comes in various wattages and speaker options. I played several at Stores and was quite impressed. I love heavy iron 100W Tube Amps too, but I sure hate carrying around the damn things. 
My tube amp lives in a corner and never moves.
A 40W bass amp at only 20 lbs is more gig friendly.
https://www.sweetwater.com/store/detail/Rum40--fender-rumble-40-1x10-inch-40-watt-bass-combo
I think this is an excellent point. Plugging an electric guitar into a mixer can result in degraded sound due to impedance mismatch. See this article from Fender (who presumably should know):
Instead of a mixer, a simple A/B/C pedal should suffice:
High impedance inputs are very important on pro gear. A lot of the inexpensive mixers don’t offer them. They’re ok for home use. You need better gear for Gigs or serious recording.
I use a DI to connect my guitar and pc for recording.
Thank you for posting the Fender article. It’s interesting.
I don’t have the technical expertise to answer efficiency, nor can I really measure the SPL myself in any way except to say “it’s pretty damned loud.” But that’s in the context of using it for guitar and keyboards at home, and from the many reports of other guitarists who’ve used this cabinet in live settings.
But I do know who can and will answer those questions and anything else about his products…the owner and designer of these cabinets. The company is Finnish, called TOOB, and the one I have is called the Metro 6.5BG. They also make FRFR models, I think some with a 10" speaker.
I don’t remember the owner/designer’s name, but it should be on the website, and he frequently answers questions under the handle “Gitterbug” on jazzguitar.be (a popular jazz guitar forum, natch).
These definitely aren’t studio monitors or anything like it, at least the guitar and bass versions…very much tuned for instruments, like a traditional cabinet.
Well there 'ya go, as McCloud would say! I should think it’s down to a little line mixer or this one for the OP’s use!
Thanks for the pointer. Interesting website.
Unfortunately they don’t seem to have any stockists in the UK.
The thing about this sort of gear is you really want to have a hands-on test before making a buying decision.
That’s a bummer. Agreed you should plug in before committing…they’re not the cheapest cabinets out there. And while these small companies tend to be good, IME, about doing test runs and returns, that’s a hassle.
Another brand I was looking at closely for small, lightweight cabinets is Raezer’s Edge cabs (spelled like that). I think they have a “New York” model that’s supposed to be especially suited for hand-carrying.
About in line with the price of the TOOB products, IIRC.
But, like many of these kind of niche products, you might have trouble finding a shop that carries one.
However, I do know for a fact (or perhaps merely a “fact”) that a number of musicians in the UK use TOOB products and would probably let you plug in, or at least give a “plug” to a show they’re playing with the cab! I dunno, maybe on Facebook or something.
I’ll have a look on YouTube. I mostly play classic rock type stuff, which means that you have a hard-hitting drummer and at least one loud guitar amp on stage, so a bass amp has to be able to keep up!
Thanks anyway… we’re sort of hijacking the original question, so I’ll leave it at that…