Table of Contents
Advertisement
EQ or side chain Filter:
INPUT
SIDE CHAIN
As explained before microphones are not intelligent devices. To describe the function of
the Side-Chain EQ and how to set it we will use an example. Let's consider the mic on the
snare drum. To avoid other drum sounds (especially base drum and hi-hat) to 'leak' into this
mike, you will put a gate in the signal path. However, since the base drum and the Hi-Hat
are near and can produce some very loud levels you will not be able to avoid the gate on
the snare drum channel to open when the base drum or hi-hat are hit. Since they will be
hit a lot of times, the gate might become almost useless since it might be open all the time.
Raising the threshold is not a solution since you might cut out some snare drum hits.
First of all: Using the EQ on the dBG-8 will not alter the sound of the signal!!! Unless you
activate the 'Listen' switch.
The signal through the dBG-8 channel is split and send to a detector circuit who is calcu-
lating it's level (necessary to know when it exceeds the threshold level and when it drops
under it again). This is called the side-chain path. When you activate the EQ, you activate
a band pass filter in the side chain path. As you all know (we hope) the sound from a snare
drum is quiet different from that of a base drum or a hi-hat. The base drum has much more
low frequency energy while the hi-hat has much more high-frequency energy.
GAIN CONTROL (VCA)
LEVEL
DETECTOR
EQ IN
Center
Gain
freq.
dB
detection
in this
area
Frequency
OUTPUT
ATTENUATION CALCULATOR
Advertisement
Table of Contents
