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4 x 8" Bass Combo

Packing four 8" Hartke patented HyDrive speakers and a 500-watt Class D amplifier into a sleek cabinet that weighs only 49 pounds, the HD508 brings exceptional bass tone to any rehearsal, stage or studio.

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  • The HyDrive Design

    HyDrive speakers feature carefully crafted paper/aluminum hybrid cone drivers. The hybrid makeup delivers an exceptional blend of warmth and attack that can't be attained by traditional all-paper bass speakers. And specific to the HD508, packing four 8" HyDrive speakers into a single cabinet creates a combined cone area that is larger, as well as able to reproduce a wider audio range, than that of a single 15" speaker.

  • JD-HD508-BK

    Power and Portability

    In addition to the impeccable sound of the HyDrive speakers, the HD508 offers tremendous power in a highly portable design. Its lightweight Class D amplifier produces an earth-shattering 500 watts of power capable of filling any rehearsal room, recording studio or performance venue. And with a total weight of only 49 pounds, the HD508 is easy to transport with its molded strap handle, metal side handles, or removable casters.

  • Shape Your Tone

    The HD508 includes a selectable Shape circuit that allows you to dial in a specialized EQ curve designed to improve tone by selectively boosting and cutting across the frequency range. In addition, a 3-band EQ provides further customization options.


Features / Specs


  • Lightweight Class D combo amplifier that weighs 49lb
  • 500 watts of power
  • Four 8" HyDrive paper/aluminum hybrid cone drivers
  • Top-mounted control panel
  • Hartke's Shape EQ knob with variable filter
  • 3-band (Bass, Mid, Treble) EQ
  • XLR direct output
  • 1/8" stereo Aux input
  • 1⁄4" headphone output
  • 1⁄4" bass input
  • Effects loop
  • Perforated steel grille
  • Molded strap carry handle
  • Two metal side carry handles
  • Four removable casters included


Rated Output Power 500 watts Peak / 250 watts RMS
Rated Input Level 77.46mv rms (@1kHz)
Total Harmonic Distortion 0.54% (@1dB below rated output, 1kHz typical)
Signal To Noise Ratio 1W/49.3dBu (1Wrms @1kHz)
Signal Gain Speaker Output 37.1Vrms
Signal Gain to Direct Out 4.2Vrms
Bass Control 70Hz
Midrange Control 700Hz
Treble Control 5kHz
Shape Control 100Hz - 900Hz
Dimensions 20″ x 12″ x 22″ / 506mm x 305mm x 560mm
Weight 49lb / 22.2kg

Warning CALIFORNIA PROPOSITION 65 WARNING: Cancer and Reproductive Harm -

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