EQ50 Owner’s Manual
12/2016
10
INSTRUCTIONS FOR USE
1. Installing the EQ50 in a Rack
RACK POWER MUST BE OFF BEFORE INSTALLING THE EQ50. The module
design is not warrantied for damage that occurs when it is inserted or removed from a
rack with power applied.
2. Module Warm Up
After power up, please allow approximately 2 minutes time for component warm up and
stabilization time before beginning critical listening or recording.
3. EQ In (Bypass Switch)
The EQ In button engages the EQ or switches in a hard-wire bypass of the entire EQ
module. With balanced input and most types of equipment used in conjunction with this
EQ, the EQ has unity gain. Therefore, by alternating between EQ In and EQ Out, the
Bypass Switch is an effective tool to audition the effect of the EQ. An LED indicates
when the EQ is engaged.
4. Setting Audio Levels
Ideal levels for the EQ50 are 0 dBu nominal at mid frequencies. While the EQ50 can
accept audio levels up to +20 dBu when the EQ settings are flat, the see-saw filter has
as much as +20 dB gain when adjusted to its extremes, so it is good practice to set the
EQ50 input levels to 0 dBu. The Low Cut and High Cut filters only attenuate the signal,
so gain added by these filters will not be a factor in setting levels.
5. Low Cut Filter
The Low Cut Filter is a passive filter that provides gentle -6dB / octave cut to
frequencies below that indicated on the knob. The cutoff frequency adjustment range is
very wide, and extends from 20 Hz to 1 kHz. By using a low order -6dB/octave filter,
minimal phase shift of the signal is realized. By providing cutoff frequency as high as 1
kHz, significant attenuation of lowest frequencies can be achieved. The plot below
shows a range of filter responses.
