The Sony SRS-X5, though a fairly large portable speaker, is an excellent option for those looking to brighten up a room or outdoor gathering with some rich, deep sound. At 2 x 8.8 x 4.8 inches and 2.6 pounds, it is still very portable, and even sports a newer Bluetooth 4.0 connection for quick and reliable wireless connection to a mobile device. It also supports speaker calling and NFC pairing for further convenience. Buy the Sony SRS-X5 or read customer reviews here. Want to browse more great options for portable bluetooth speakers? Check out Heavy's list of the Top 10 Best Portable Bluetooth Speakers.