After using them for a while, I say like Amir in this test with fairly similar small low-powered active speakers.:
Just keep your expectations low as far as playback level.
This is a review and detailed measurements of the Edifier MR4 powered "studio" monitor (speaker). It was sent to me by the company and costs US $130. This is a very small speaker. It looks larger in the marketing material. You can easily carry it with one hand. I was impressed by the use of...
audiosciencereview.com
Edifier MR4's amp: 42 W RMS. XTZ Tune 4 amp: 50 W RMS.
You might think it should be enough for near-field listening, and it does. EXCEPT when using Bluetooth. Sometimes the XTZ Tune 4's maximum level can only reach a bit above normal listening volume and then I still have the speakers placed close to me.It works but there is no headroom. I do not know in and of itself if it is weak Bluetooth signal sent out from my Tablet. Bluetooth is not something I normally use otherwise, so I have limited Bluetooth gadgets to compare with.
Analog input, where I can adjust the input level to the XTZ Tune 4 speakers via a active crossover. Then I can play really loud. A good bit above normal listening volume then.
Whether the Edifier MR4 also has the same modest SPL I don't know but I can suspect it, given what Amir says. I don't know if Amir tested the Edifier MR4's SPL using Bluetooth.
In any case, at normal volume, together with a sub via sub out on the XTZ Tune 4, it's perfect for some Youtube surfing, maybe watching a movie in bed with a Tablet.