Volume Controls:
A pair of small trimpots on the
Sd-25
are used to set
the maximum audio output level from the
Line Level
Input/Output
Sd Volume
Mixer Volume
IR Sensor
Window
Sd card. The operating modes which ramp the audio
up and down can never exceed the level set by
these pots.
An additional pair of pots is used to set the levels for
the
ʻ
mixer
ʼ
inputs.
You can adjust these pots using a small
ʻ
trimmer
ʼ
screwdriver. A suitable screwdriver comes as part of
the
.
These trimpots are smaller than you. Do not use a
big screwdriver on them. Do not apply too much
force.
They can be broken if you strong-arm
them!
Line Level Inputs and Outputs:
Tw o g o l d p l a t e d
ʻ
R C A
ʼ
j a c k s a r e
available on
Sd-25s
(as shown in the
preceding photo). A
switch on the bottom
of the case allows
you to switch these
jacks between a line
level output of the
audio coming from
the Sd card, or a line
level input that gets
mixed with the audio coming from the Sd card.
When the switch is set to the
ʻ
Line Out
ʼ
position, the
audio from the Sd Card is sent to both the amplifier
and the RCA jacks. Only the audio going to the am-
plifier is routed through the
ʻ
Sd Level
ʼ
pots. The
RCA outputs will always be at full volume unless the
audio level is reduced in the DSP by a serial volume
command, DMX-512 volume command, or full or
half muting command from the trigger inputs.
To use the line level outputs, just run a pair of RCA
cables to your amplifier (or amplified speakers), just
as you would if you were connecting an iPod or CD
player. The line level outputs are robust enough to
drive headphones and small speakers directly.
When the switch is set to the
ʻ
Line In
ʼ
position, line
level audio signal from a
Sd-10
or another
Sd-25
audio repeater, pre-amplified microphone or any
other line-level audio source can be plugged into the
two RCA jacks. Two
ʻ
Mixer Level
ʼ
trimpots can be
used to adjust the audio levels of the mixer inputs.
These inputs
ʼ
levels are not effected by a serial vol-
ume command, DMX-512 volume command, or full
or half muting command from the trigger inputs.
In this example, a pre-amplified (or line level) micro-
phone is fed into the mixer inputs of the
Sd-25
. The
ʻ
Push to Talk
ʼ
button on the microphone is fed into
the
ʻ
b
ʼ
input of the
Sd-25
. The
Sd-25
is configured to
ʻ
duck
ʼ
the audio from Sd the card to a lower level
when it sees a closure on the
ʻ
b
ʼ
input. When the
microphone button is pressed, the
Sd-25
ramps the
prerecorded audio down to a lower level, and the
microphone is used to make an announcement.
When the
ʻ
PTT
ʼ
button is released, the prerecorded
audio ramps back up to the normal playback level.
Gilderfluk
e
&
Company
www.Gilderfluke.com
DIN Rail
Mount
DIN Rail
Mount
Sd-25
w/ DMX
Mixer In
Line Out
Bridged
Stereo
Gilderfluke & Co.• 205 South Flower Street • Burbank, California 91502 • 818/840-9484 • 800/776-5972 • fax 818/840-9485
Sd-25 w/DMX Manual • page 15 of 32 • © September 4, 2014 • Gilderfluke & Co. • DCM