Conclusion: In giving its SMA3 and SMA4 speakers matching looks, functionality and price tags Pioneer is curiously competing with itself. That said the smaller, battery packing SMA3 and more static, more powerful SMA4 do have strong differentiators. In isolation this makes Pioneer's range intriguing, but while the SMA3 was found lacking in audio quality this still haunts the bigger SMA4.
Pros: Class leading wireless options, Thumping bass and midrange, Relatively compact form factor
Cons: Uninspired design and build materials, Outmuscled by rivals, Lack of detail in higher frequencies