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EQ1ch Tube Equalizer
MCAudioLab
5
OUTPUT
The output knob is master volume control (attenuation control potentiometer).
It determine the amount of signal sent to the output stage. The rang is from -
(knob hard
left) to the maximum amount of gain stage (hard right).
INPUT
The rear panel XLR (balanced) input connector is optimized for low impedance audio line
signal (tip. 600 Ohm).
BYPASS
switch
This toggle switch connects directly the input XLR socket to the output XLR one (pin to pin
connection). The bypass switch act only if EQ1ch is powered on.
When the bypass switch is on, the LED meter is on standby mode.
LED METER
Three led indicates the amount of signal present at the XLR output according to +4dB
standard:
The "sgn" green led indicates that a signal of (at least) -15dB is on XLR out.
The "0dB" orange led indicates that a signal of +4dB is on XLR out.
The "ovr" red led indicates that a signal of +15dB or more is on XLR out.
Values of amount signal are given by IC comparator
EQ CONTROLS
¥
LOW FREQ.
Rotary switch selector (
A
)(20, 30, 60, 90, 120, 150Hz). Use it to
select low frequencies
Low Boost
(
B
) knob controls the amount of gain on
selected freq. The Low Boost is a shelf filter with 14dB max of gain.
Low Cut
(
C
) knob controls the amount of attenuation on
selected freq. The Low Cut is a shelf filter with 12dB max of
attenuation. Boost and Cut controls may be used at the same time;
the cut filter action is reduced if used with boost control trim
exceedind the first quarter (
K
).
MID./HIGH FREQ.
Rotary switch (
D
) (12 steps) selector for Mid-/High freq. (600Hz; 1,
1.5, 2, 3, 4, 5, 8, 10, 12, 14, 16KHz)
Boost
pot. knob (
E
) controls the amount of gain on selected freq. by
stepped rotary switch. The Boost is a peak parametric filter with
20dB max of gain. The maximum gain depends on the parametric
“Q” knob control position.
“Q” control knob on mid./high freq. (
F
)
The “Q” pot. knob control can be used to vary the “Q” factor in
mid./high filter section. It acts on boost of mid./high section control
only. The “Q” control knob makes peak filter broad or sharp
HIGH FREQ.
Rotary switch selector (
G
) (4, 6, 8, 10, 12, 16, 20KHz). Use it to
select high frequencies
Low Cut
(
H
) knob controls the amount of attenuation on
selected freq. The Low Cut is a shelf filter with 10dB max of
attenuation.
FUNCTIONS
High-Q
A
B
D
G
E
H
F
k
C
