HBP-1 H Series Bass Preamplifier User’s Guide
The H Series Bass Preamplifier by James Demeter uses the same all tube front end found in his clas
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sic VTBP-201S Bass Preamplifier and combines it with the revolutionary H Series circuitry found in his
professional audio H Series line. This preamplifier provides the best of both the tube and solid state
world. It features high voltage (250V) 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 micro
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phone or line level, both a balanced TRS line level output and an unbalanced line level output for ampli
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fier connections, and a mute switch. As with all Demeter equipment it is meticulously hand wired, using
the finest components and assembled in the U.S.A.
CONTROLS AND FEATURES
INPUTS
Passive: is for passive basses or basses with lower output.
Active: is provided for basses with internal preamplifiers or basses with very high output.
TUBE PREAMPLIFIER
Volume: controls the output level for all outputs except the effects loop and tuner.
Treble: a passive 6 dB per octave shelving high frequency control. Boosts or cuts 10 dB. This control af
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fects the 4 k to 20 k range.
Middle: a passive 6 dB per octave peaking mid frequency control. Boosts or cuts 10 dB. This control is
centered at 1 kHz.
Bass: a passive 6 dB per octave shelving low frequency control. Boosts or cuts 10 dB. This control af
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fects the 120 Hz to 10 Hz range.
Presence: an active 6 dB per octave shelving upper mid to high frequency control. Boosts in the 1 k to
20 k range. The flat setting for this control is the knob turned all the way to to the left.
PARAMETRIC EQ
EQ Switch: switches in or out of circuit the parametric EQ.
Boost/Cut: controls the boost and cut of the parametric EQ plus or minus 12 dB.
Frequency Controls: continuously variable frequency selection for each bandwidth (low frequency or
mid frequency). The number shows the center frequency.
Q or Width Control: controls how wide or narrow the affected frequency are. The most narrow setting is
one half octave and the widest is four octaves around the center frequency.
6990 Kingsbury Road | Templeton, CA 93465 | 805-461-4100 | http://www.demeteramps.com/
