Altec Lansing Expressionist-PLUS FX3021 2.1 Speaker System Crystal-clear Sound Precision-engineered 2 (50 mm) speaker drivers delivers pure, distinct full-spectrum audio Convenient design Adjustable base lets you direct the sound straight to your ears. Desktop Subwoofer Feel exceptional bass from a down-firing, long-throw 5.25 (135 mm) woofer. Built-in controls Power and volume are at your fingertips. Audio Alignment Drivers, enclosure and electronics are balanced for optimum sound.