The HD50 (50 watts, 10 driver) employs Hartke’s patented HyDrive Speaker Technology that offers a carefully crafted hybrid (half paper, half aluminum) cone bass speaker. By combining the warmth and roundness of paper with the punch and attack of aluminum, the HyDrive design produces serious tone that is ideal for bass players of all genres and styles. Packed with professional features, the HD50 combo is designed to be user-friendly and reliable for players of all levels. The combo offers Volume, Bass, Mid and Treble controls on its top-mounted amplifier panel, allowing for easy adjustments. It also features an 1/8 stereo Aux input for playing along with your favorite tracks via an MP3 player and a 1/4 headphone output for more intimate practice sessions. In addition, the HD50 has a built-in limiter to ensure constant amp operation at safe levels. Lastly, its solid enclosure is finished in a stylish fashion with a sleek, perforated metal grille and molded strap carry handle. Features 50 watts of output power 10 HyDrive paper and aluminum cone driver Top-mounted amplifier with Volume, Bass, Mid and Treble controls 1/4 input for active and passive bass guitars 1/8 stereo Aux input for stereo line level devices (MP3 players, drum machines, keyboards, etc.) 1/4 headphone output Built-in limiter Perforated metal grille Molded strap carry handle Specifications Rated Output Power (@1 kHz, 4 ohm, 1% THD): 50 w Rated Input Level (@ 1 kHz): 64.6mv rms Total Harmonic Distortion (@ 1 dB below rated output, 1 kHz typical): 0.09% Signal To Noise Ratio (1 Wrms @ 1 kHz): 1W/60dB, 45W/75dB Signal Gain: 24dBV Equalizer BASS, MID, TREBLE Center Frequency Bass 100 Hz Mid 400 Hz Treble 10 kHz Headphone Output: 125mW/32 Ohms Fuse Type: glass tube fuse Fuse Rating US & Japan T1.5AL AC250V UK & European T800mAL AC250V Weight: HD50 34 lb; 15.4 kg Dimensions (HxWxD): HD50 16.9” x 16” x 13”; 428 mm x 406 mm x 304 mm