Pioneer have released a range of single-enclosure wireless speakers for use with smartphones, tablets and laptops. But they are not the typical Bluetooth wireless speakers that one would ordinarily think of.
Here, they can either work with a small network whether by Wi-Fi wireless or an Ethernet connection; or they can become their own Wi-Fi access points. They implement Apple AirPlay or the common DLNA 1.5 Digital Media Renderer protocols which makes them work with Apple or industry-standard portable-media playback setups.
They also have a USB connection for directly connecting one of those high-capacity iPod Classics that is full to the brim with music or other iPod / iPhone devices; as well as having a line-in jack for other media players or tuners; or simply serving as extension speakers to an existing sound system.
The difference among the models is the ability to work on battery power or the speaker setup used in the units. The cheapest model, the XW-SMA1 uses a 3” speaker for each channel and a 3/4” tweeter for both the channels and doesn’t have battery power. The step-up model, the XW-SMA3 uses the same speaker configuration but can run on its own lithium-ion battery for 4 hours at maximum volume. The top-of-the-line model, the XW-SMA4 has the battery power but can yield better bass through the use of a 3” speaker and 3/4” tweeter per channel and a 4” bass speaker (subwoofer) shared by both channels.
What Pioneer has done is to achieve a highly-compatible wireless speaker set that can work with the standard DLNA-compliant home network which could be based around Windows computers and Android smartphones as well as being able to please the Apple fanbois. This is able to be done without having to resort to Bluetooth technology.
If I was choosing one of these for summer outdoor fun, I would go for the XW-SMA3 or the XW-SMA4 if you value that bassline in the music. The battery-power ability can come in to its own when you are near the pool or on the deck without needing to run extension cords everywhere.