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The Hartke HA2500 Bass Amplifier is a rackmountable 250W bass amplifier designed to amplify passive and active bass guitars in live performance and recording environments. The HA2500 features two pre-amplification input knobs to allow custom blending of tube and solid state tone, and a 10-band graphic equalization. The amplifier's dedicated preset button allows you to set an equalization curve, and 2 adjustable contour knobs are designed to provide you with more sound-shaping possibilities. The built-in compressor allows you to smooth out volume differences between notes. The amplifier also features LEDs that show you the settings of the graphic equalizer in low-light environments as well as a two-color LED that continuously shows the status of the compression circuitry in response to your playing. A ground lift switch is provided to prevent hum or buzz from entering the signal, and a pre/post switch allows the direct signal to be derived either before or after equalization.
Front Panel: 1 x 1/4" phone jack, passive input 1 x 1/4" phone jack, active input
Rear Panel: 1 x AC input 2 x 1/4" phone jack, speaker output 1 x 1/4" phone jack, effect send 1 x 1/4" phone jack, effect return 1 x 3-pin XLR male, direct output
Front Panel: 1 x Pre-amp A tube control knob 1 x Pre-amp B solid state control knob 1 x Compression knob 1 x Graphic equalizer in/out switch 10 x Graphic EQ control slider 1 x Contour low pass control knob 1 x Contour high pass control knob 1 x Master volume control knob 1 x Power switch
Rear Panel: 1 x Fuse sled 1 x Balance control knob (HA3500C and HA5500C only) 1 x Direct out post/pre switch 1 x Direct out normal/ground lift switch
1 x Compression, green/red 1 x Graphic equalizer 1 x Power
Rated Output Power
250 W @ 4 ohms, 180 W @ 8 ohms
Signal to Noise Ratio
Approximately 78 dB
Contour Low Pass: ± 18 dB @ 100 Hz Contour High Pass: ± 18 dB @ 10 kHz Ten-Band Graphic: ± 15 dB, center detented @ 30 Hz, 64 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 3 kHz, 5 kHz, and 8 kHz