Operating The D1500 With An Analog 31-Band Equalizer - Samson D-150 Owner's Manual

Operating the D1500 with an Analog 31-band Equalizer

• If the Pink Noise sounds very loud already, adjust
the reference point of the display by pressing the
RTA switch, then GAIN and then turn the Data
Wheel clockwise until you see LED Meters operat-
ing around 0.
• If the Pink Noise still sounds loud but you still
don't see the LEDs, check the Mic gain by pressing
Global once or twice until you see MG., then turn
the data wheel clockwise, and confirm by press-
ing STORE. Be sure to Check the D1500's Main VU
meter as well to set the proper mic level.
• If the Pink Noise sounds low in level, make the Pink
Noise louder by raising the input faders and/or
gains on the mixer.
• If the Pink Noise still sounds low in level, add more
GAIN from the D1500 Pink Noise generator by
pressing GEN, then GAIN and then turning the
Data Wheel clockwise to raise the level.
Of course, good gain staging is the key to any great
sounding loudspeaker system, so be careful to check
your meters at the various inputs and outputs on your
mixer, equalizer and power amplifiers to avoid any
clipped signals.
If the LED meters read very high on the display, or if
all the LEDs are illuminated, you will need to do one,
or a combination, of the following:
• If the Pink Noise sounds too loud in level, make the
Pink Noise lower by lowering the input faders and/
or gains on the mixer.
• If the Pink Noise still sounds too loud in level,
reduce the GAIN from the D1500 Pink Noise gen-
erator by pressing GEN, then GAIN and then turn-
ing the Data Wheel counter clockwise to lower the
level.
• If the Pink Noise is at a good level (about the same
level that you expect the system to be at during
normal operation), adjust the reference point of
the LCD display by pressing the RTA switch, then
GAIN and turn the Data Wheel counter-clockwise
until you see LED Meters operating around 0.
• If the Pink Noise is at a good level (about the same
level that you expect the system to be at during
normal operation) , check the Mic gain by press-
ing Global once or twice until you see MG., then
turn the data wheel counter-clockwise to lower
the input of the measurement microphone, and
confirm by pressing STORE. Be sure to Check the
D1500's Main VU meter as well to set the proper
mic level.
Now that you have set good levels for the mixer,
and the D1500 Pink Noise generator, Mic input and
RTA reference point, you can begin to measure the
response of your system and adjust your graphic
equalizer for a flat response. At this point you should
see that some of the D1500 frequency bands will be
displaying different levels. The goal is to make all the
LCD meters read as close to 0 as possible.
Assuming you are using a 31-band graphic, you will
get a one-to-one correlation between your graphic
EQ's and the D1500's LED meters. So, if you see the
particular frequency on the D1500 band that has a
meter showing a high level, select the corresponding
fader on your graphic and pull it down. While lower-
ing that fader, watch corresponding LED meter on
the D1500 and lower the fader until the LED meter
reaches zero.
Conversely, if you see a particular frequency on the
D1500 band that has a meter showing a low level,
select the corresponding fader on your graphic and
push it up. While raising that fader, watch the cor-
responding LED meter on the D1500 and raise the
fader until the LED meter reaches zero.
Now perform the same procedure for each frequency
band until all of the D1500's LED meters are set to
0. Once all the D1500's LED meters are set to 0, your
system is flat.
20