LEM TWIN SERIES, Owner'S Manual

Page: 45 / 72

9
TWIN
MONO input channel
MIC
1
PAN
MON
HIGH
LOW
GAIN
ì
L
0
0
0
10
-
15
-
15
-
15
R L
15
0 10
0 10
0 10
4 4
0 0
1
10
-
20
-
15
-
45
-
15
15
-
15
ì
P
E
A
K
REV
AUX1
MON
MULTI
AUX2
LINE
b) EQ Section
The MONO input channel has a built-in signal processing section
which enables regulation of the tone characteristics of the original signal.
This section comprises a 2-band equalizer: High & Low. The pots
controlling the EQ amplitude are centre-dented to facilitate zeroing.
The equalizer section is POST-GAIN, so has effect on the signal after it has
been amplified by the gain control. Any excessive boosting (particularly on
the low frequencies) could cause the PEAK LED to light up.
HIGH
HIGH frequency control: gives a 15dB boost or cut with turnover
frequency at 10 kHz . This EQ control has a “SHELVING” curve.
With “SHELVING” curves, the boost or cut of the amplitude of the various
frequencies follow an upward curve which goes from a minimum value (in
this case 1kH z) , at which there is minimum amplitude intervention (±0
dB) , to a reference value (in this case 10 kHz ), at which there is an amplitude
intervention of ±15dB . If you want a brighter, clearer sound, turn the pot to the right
(+). If on the other hand, the sound is annoyingly treble or metallic, turn it to the left (-).
LOW
LOW frequency control: gives 15dB boost or cut with a 70Hz turnover
frequency. This equalizer control acts exactly like the HI control
(“SHELVING” curve), the only difference being that the turnover
frequency is set at 70Hz.
Using this control, a more “full-bodied” sound can be obtained, or “booming”
or unpleasant effects due to excessive low frequencies can be eliminated.