12" Bass Combo The HD75 Bass Combo packs Hartke's patented HyDrive speaker technology into a sleek combo design that greatly enhances your low-end tone and has enough power to handle any rehearsal room or small venue. The HD75 also maintains Hartke's commitment to producing quality bass amplification with exceptional durability. The HyDrive Design The HD75 (75 watt, 12" driver, 1" tweeter) features Hartke's patented HyDrive speaker technology, which offers a meticulously crafted hybrid (half paper, half aluminum) cone bass speaker. Combining the warmth and roundness of paper with the punch and attack of aluminum, the HyDrive design produces a serious tone ideal for bassists of all genres and styles. Solid... With Style Packed with professional features, the HD75 combo is designed to be easy to use and reliable for players of all levels. The combo offers volume, bass, mid, and treble controls on its top-mounted amp panel, as well as a 7-band graphic EQ for easy tweaking. It features a full effects loop, as well as a 1/8" stereo auxiliary input for playing along with your favorite tunes via an MP3 player, and a 1?4" headphone output for more intimate practice sessions. In addition, the HD75 features a built-in limiter to keep the amp running at safe levels. Finally, its rugged enclosure is stylishly finished with a sleek, perforated metal grille and molded strap carry handle. With the exceptional sound of HyDrive speakers in a durable, highly portable enclosure, the Hartke HD75 bass combo is able to perform at levels far beyond ordinary bass combos. Features 75 watts of output power 12? HyDrive paper and aluminum cone driver 1? tweeter Top-mounted amplifier with Volume, Bass, Mid and Treble controls 7-band graphic EQ 1?4? input for active and passive bass guitars 1/8? stereo Aux input for stereo line level devices (MP3 players, drum machines, etc.) 1?4? headphone output Built-in limiter Effects loop Perforated metal grille Molded strap carry handle Specifications Rated Output Power 75w Rated Input Level (@_1 kHz) 44.6mv rms HD150 38.8mv rms Total Harmonic Distortion (@ 1 dB below rated output, 1 kHz typical) 0.32% Signal To Noise Ratio 1W/62dB Signal Gain Speaker Output 35V Signal Gain to Send Jack 545mV Bass Control 50 Hz Mid Control 700 Hz Treble Control 10 kHz Seven-Band Graphic EQ Frequencies 63Hz, 125Hz, 250Hz, 500Hz, 1.25kHz, 2.5kHz, 5kHz Dimensions 19.9? x 18.6? x 13.9? / 506mm x 472mm x 353mm Weight 48.2lb / 24.7kg