Behringer 904B Quick Start Guide
Quick Start Guide
904B VOLTAGE CONTROLLED
HIGH PASS FILTER
Legendary Analog High Pass VCF
Module for Eurorack
Controls
(1)
(2)
(3) (4)
(5)
(1) FIXED CONTROL VOLTAGE – Also referred t o as “cuto
frequency”, this knob manually determines the frequency
below which frequencies are attenuated. The resulting
freque ncy will depend on t his knob’s settin g as well as
voltage r eceived from the co ntrol inputs.
(2 ) FREQUENCY R ANGE – Select betw een Low (4 Hz to 20
kHz) or High (10 Hz to 50 kH z) to set the frequen cy band in
which the xed control volta ge operates.
(3 ) SIGNAL INPUT – Conn ect the incomin g signal via 3.5 mm
TS cable.
(4 ) SIGNAL OUTPUT – Send the p rocessed signa l to another
module via 3. 5 mm TS cable.
(5 ) CONTROL INPUTS – Con nect control vo ltage signals fro m
other mod ules to aect the c uto frequenc y. The sum of
the volta ge received double s the frequenc y cuto point
for each 1 V in crease.
Power Connection
The module c omes with the requ ired power cable f or connecting
to a standa rd Eurorack power su pply system. Fol low these
steps to con nect power to the m o dule. It is easier to make
these con nections bef ore the module has be en mounted into
a rack cas e.
1. Turn the power su pply or rack case p ower o and
disconne ct the power cabl e.
2. Insert the 16- pin connector o n the power cable into t he
socket on t he power supply or rac k case. The connec tor has
a tab that wi ll align with the gap in t he socket, so it can not
be inser ted incorrec tly. If the power supply d oes not have
a keyed socke t, be sure to orient pi n 1 (-12 V) with the red
stripe o n the cable.
3. Insert the 10 -pin connecto r into the socket on th e back of
the module. T he connector has a t ab that will align wi th the
socket fo r correct ori entation.
4. After both en ds of the power cable hav e been securely
attac hed, you may mount the mo dule in a case and tur n on
the power supply.
Installation
The neces sary screws ar e included with th e module for mount ing
in a Eurorac k case. Connect t he power cable bef ore mounting.
Dependi ng on the rack case, th ere may be a series of x ed holes
spaced 2 HP ap art along the leng th of the case, or a tra ck that
allows indi vidual threaded p lates to slide along th e length
of the cas e. The free-movi ng threaded plate s allow precise
positio ning of the module, bu t each plate should be po sitioned in
the approx imate relation to th e mounting holes in yo ur module
before a ttaching the sc rews.
Hold the mo dule against the Eur orack rails so that e ach of the
mounting h oles are aligned wi th a threaded rail o r threaded
plate. Att ach the screws par t way to start, w hich will allow
small adjus tments to the pos itioning while you g et them all
aligned. After the nal position has been established, tighten the
screws d own.
Specications
Signal Input
Type 3.5 mm jack, DC coupled
Impedance 33 kΩ, unbalanced
Maximum input level +10 dBu
Signal Output
Type 3.5 mm jack, DC coupled
Impedance 620 Ω, unbalanced
Maximum input level +10 dBu
Output noise Typically -70 dBu,
22 Hz - 22 kHz
Control Inputs
Type 3 x 3.5 mm jacks, summed
Impedance 100 kΩ, unbalanced
CV range 1 V per octave,
12-octave range
Controls
Fixed control voltage +/-6 V, summed with
CV inputs
Frequency range selector Low = < 4 Hz to 20 kHz,
24 dB per octave
High = < 10 Hz to 50 kHz,
24 dB per octave"
Power
Power supply Eurorack
Current draw 55 mA (+12 V),
55 mA (-12 V)
Physical
Dimensions 43 x 40 x 129 mm
(1.7 x 1.6 x 5.1")
Rack units 8 HP
Weight 0.09 kg (0.2 lbs)
LEGAL DISCLAIMER
Music Tribe accepts no liability for any loss which may be suered by any
person who relies either wholly or in part upon any description, photograph,
or statement contained herein. Technical specications, appearances and
other information are subject to change without notice. All trademarks are the
property of their respective owners. Midas, Klark Teknik, Lab Gruppen, Lake,
Tannoy, Turbosound, TC Electronic, TC Helicon, Behringer, Bugera, Auratone
and Coolaudio are trademarks or registered trademarks of Music Tribe
Global Brands Ltd. © Music Tribe Global Brands Ltd. 2019 All rights reserved.
LIMITED WARRANTY
For the applicable warranty terms and conditions and additional information
regarding Music Tribe’s Limited Warranty, please see complete details online
at musictribe.com/warranty.
Zhongshan Eurotec Electronics Limited
No. 10 Wanmei Road, South China Modern Chinese Medicine Park,
Nanlang Town, 528451, Zhongshan City, Guangdong Province, China
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