Big sound from a small speaker. XL technology is the formula of the finest SA woofer designs. XL technology is only available in SA speakers.

小型喇叭爆发强劲的声音。XL技术是出色的sa低音喇叭设计的公式，仅适用于SA喇叭。

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NingBo ETTON Electronics Ltd. Company set up in 1995. Product include car speaker, Household woofer unit, pa speaker Cabinet, Raw materials of speaker and Boom box, etc.

宁波尊隆电子有限公司成立于1995年，产品包括汽车扬声器、家庭音响高低音单元、舞台音箱、扬声器配件及密封式音箱等。

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Each speaker in this system has a tweeter, woofer and four-inch passive bass radiator on the back that moves a surprising amount of air.

WSJ: Big Sound, Wire-Free: Audyssey Bluetooth Speakers | Geek Chic

Specs were a bit thin but we do know it's made up of thousands of blue lights, oversized knobs and the speaker cabinet contains four speakers powered by three separate amps -- the bottom speaker being a huge 15" "Ultra Super Woofer.

ENGADGET: Panasonic Powerlive Max retro boombox hands-on Hands-on