Demeter Amplification HBP-1 - Bass Preamp/EQ

800 Watt Class D amplifier, driven by Jensen transformers into the HBP-1 preamplifier circuit
Demeter Amplification HBP-1 - Bass Preamp/EQ
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A Versatile Solution for Bass Amplification

The Demeter Amplification HBP-1 - Bass Preamp/EQ by James Demeter integrates an 800 Watt Class D amplifier, driven by Jensen Transformers, into the HBP-1 Preamplifier circuit. This unit uses the same all tube front end found in his classic VTBP-201 Bass pre-amplifier and combines it with the revolutionary H Series circuitry found in his professional audio H Series line. Utilizing the best of both the tube and solid state world, the HBP-1-800D features high voltage (250 V) tube front end (providing all of the preamplifier gain and passive tone controls), a two band solid state fully parametric equalizer that is tuned for bass, a fully adjustable active effects loop with controls up front, a tuner output, a full balanced output with switchable mic or line level, both a balanced TRS line level output and an unbalanced line level output for amplifier connections and a mute switch.

The pre/power amp circuit is unlike any other. Using Jensen transformers, Demeter have achieved complete isolation between our pre & power amp section. This allows for noiseless operation, whether you use the preamp on it's own, or in tandem with the power amp output. Our transformer based design also has the unique advantage of 'warming' up the power amp output.

The power amp section also features a Speakon and 1/4” speaker output. As with all Demeter equipment, it is meticulously hand-wired using the finest components and assembled in the U.S.A.

Preamp Specifications:

  • Input impedance: > 1 megOhm
  • Minimum load impedance: 600 Ohms
  • Output impedance (studio output): 50 Ohms, balanced
  • HBP1J: 150 Ohms (balanced)
  • Maximum output: + 24 dB V @ 600 Ohms
  • Gain: Adjustable to +10 dB Mid 440 Hz to 4 kHz
  • EQ gain : ±15 dB
  • Signal to noise ratio: -80 dB
  • THD: .5%
  • Frequency response: 10 Hz - 40 kHz
  • Tube: 12AX7a selected
  • Parametric EQ: Q or width continuously variable Low 40 Hz to 440 Hz / Mid 440 Hz to 4.4 kHz
  • Inputs: 1/4" (passive and active)
  • Outputs (preamp): 3-pin balanced mic/line, TT, XLR & ¼"
  • HBP1J (preamp): 3-pin balanced mic, with switchable post/pre eq
  • Chassis: Single space rack
  • Operating voltage: 115 V/230 V AC switchable
  • Power supply: 250 V fully regulated
  • Filament: 12.6 V fully regulated

Power Amp Specifications:

  • Outputs (power amp): 1/4” Speaker & Speakon
  • Output impedance (power amp): 4 Ohm, 8 Ohm, 16 Ohm
  • Output Power (power amp): 800 watt RMS @ 4 Ohms, 500 watt RMS @ 8 Ohms

Additional Information

Condition New
Input Connectors 1/4 in. TS
Output Connectors Analog XLR, 1/4 in. TRS
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