Wifi receiver transmitter kits

I just got a set of W3s for a third their retail price and want to give it a go. 

Now it’s about picking decent powered or active speakers. 
Any suggestions? 
I’m torn about getting a used pair of KEF LSX or LS50. Reviews about their stellar sound qualities, probably unbeatable in their size class, are intriguing, but reviews about software and connectivity issues are a turnoff given their hefty price tags. 
But maybe the latter matters less when connected to the W3. Not sure.

Any alternatives? I’ll use them as secondaries in a large space (so maybe studio monitors are not ideal, not sure about that either). 
 

I'm aware that there's still no adequate wireless solution that can compete with wired separates in sound quality. There are limits... but since I'm hooked to some of the convenience of streaming, my aim is to get at least a decent experience, without braking the bank. 
The mains will still be wired. 

I currently lean towards adding more Wiims or an Audioengine W3 kit. Hard to decide.

raphaz You only need one transmitter and one receiver for 2 speakers as long as you have long enough cables to go from the receiver to each of the speakers. One for the left channel and one for the right and you can place the receiver somewhere in the middle. 

You may need adapter plugs to go from whatever type of output your source has (XLR, RCA, 1/4") to the transmitter, as well as whatever type of connections your speakers have to connect the receiver to the speaker's inputs.  Those are cheap!

As far as apps, there is no app.  They are independent units that communicate at 2.4 GHz from the transmitter to the receiver.  Similar to wirelessly connected microphones, guitars, etc.  

I don't have an opinion on Wiim Mini.  I've never messed with those, but I can tell you that there is no substitute for full size audio components if you are concerned with fidelity.  I like all my stuff wired!

Thank you, ellajeanelle! 
 

Looks interesting!

One of these transmitters would probably do.

But do I need one receiver per speaker (e.g. two for stereo) in the other room? And does this require and come with a proprietary app?
I wonder if for that price I would be better off with Wiim Mini.

I have used these (both transmitter and receivers) in the past with no issues whatsoever. No snake oil here! They do what they’re supposed to do, and they do it very well without any audibly noticeable loss and with a flawless uninterrupted wireless connection.

I’ve recommended these to others that did not want to have to run wires to their rear speakers and even to an adjacent room and building and they all have been happy also.

Do stay away from Bluetooth. With Bluetooth you will lose A LOT of fidelity.

DW 20T Wireless Audio Transmitter - Sweetwater

Klark Teknik DW 20R Wireless Audio Receiver | Sweetwater