The XW-SMA4 is the biggest speaker in Pioneer's current wireless speaker lineup, but the bigger size just means it packs a bigger punch. Despite its size, PC World Australia said "itâ€™s heavy but still compact" and What Hi-Fi says there's a "fair amount of heft for a still relatively compact speaker." The larger design allows Pioneer to pack in five total speakers, helping the XW-SMA4 produce a sound PC World Australia called "one of the best speakers weâ€™ve heard in the wireless music category." Sound+Vision said it's "surprisingly loud" and that there is "definitely more bass than youâ€™d usually expect from such a small speaker." Even though the SMA4 is loud and produces a good sound experience, Trusted Reviews warns that "while thick bass and midrange provides an initially positive impression ... over time it can deaden the listening experience as the detail and nuances of a track are lost." Pioneer has packed a wide range of features into the SMA4 including Ethernet and a USB connection, as well as support for Apple's AirPlay to help give you a whole-house audio experience. At the right price the SMA4 proves a viable alternative to the Big Jambox and Sonos Play:3 -- just be mindful of the powerful bass.