High-Performance Audio Without the High Price Tag. Designed by the same team that produced Mackie's best-selling compact active loudspeakers, the THUMP TH-15A Active Loudspeaker provides amazingly accurate response from 20kHz all the way down to 40Hz, giving it just the right amount of punch. All-new Class D circuitry drives its custom, high-precision 15-inch woofer to greater volumes with less heat than is possible with competing designs. Onboard electronics include full system protection packed into a durable polypropylene enclosure, making TH-15A the most lightweight powerhouse in its class. Exceptional Sonic Performance TH-15A Active loudspeakers put out a tremendous amount of sound for their size and price tag. The two-way bass reflex (ported) design generates ample quantities of chest-pounding bass, and its 1" compression driver ensures smooth, wide dispersion. We even inserted a 3-band equalizer at the input to give you all the tonal control you could ever want, with an available 15dB boost or cut at 80Hz (for the Lows), 100Hz to 8kHz (sweepable Mids) and 12kHz (for the Highs). With the TH-15A's extremely versatile EQ, you can add some extra thump to that kick drum, bring out the sizzle in your hi-hats and add pop to vocals.