Sd-25 w/DMX Configuration & Installation
Before the
Sd-25 w/DMX
can be used, you will need to drag-n-drop your SoundFiles onto a Sd or SdHC flash card,
attach a power supply, speakers, and (optionally) a switch or DMX-512 to start the
Sd-25 w/DMX
playing
. Select the
operating mode using the DipSwitch to tell the
Sd-25 w/DMX
how you would like your SoundFiles to be played.
Sd/SdHC Card:
Any standard Secure Digital (Sd) or SdHC flash
memory card can be used with the
Sd-25
. As of this
writing, Sd and SdHC cards are available in sizes up
to thirty-two GBytes. These can
hold months of continuous audio
playback. The
Sd-25
supports up
to 255 SoundFiles in most operat-
ing modes. Some modes support
up to 32,767 SoundFiles.
The flash card should be format-
ted
ʻ
FAT
ʼ
or
ʻ
FAT32
ʼ
(it will proba-
bly come that way).
Most laptops now come with a
built-in Sd card reader/writer slot.
If your PC doesn
ʼ
t have one of
these, you will need to use an Sd
card reader/writer attached to
your PC or Mac through a USB
port.
You load Mp3 and .wav files onto
the Sd card by simply dragging-n-
dropping them onto your Sd card.
On bootup, or when a Sd card is
inserted in the
Sd-25
, it will sort
the SoundFiles. For 255 or less
SoundFiles, they are played in
alphanumeric order, based
upon the 8.3 DOS FileName. If
there are more than 255
SoundFiles on the Sd card,
then they will be played in Win-
dows Drag-n-Drop order.
For the
Sd-25s
to recognize a
SoundFile, its FileName must start with an alpha-
numeric character, and it must have the extension of
either
ʻ
.wav
ʼ
or
ʻ
.Mp3
ʼ
. If a SoundFile meets these
criteria, the
Sd-25
will attempt to play it. If the
Sd-25
can
ʼ
t play a SoundFile for any reason, it will give up
after a few seconds.
The
Sd-25
will play just about all stereo Mp3 or .wav
file formats. Mp3 bit rates up through 320 Kb/second
are supported. .Wav files of up to 48 Kbytes/second
and sixteen bit are supported.
If a file does not play, it is most often
caused by a large (more than 2 MBytes)
ʻ
id3
ʼ
tag at its front. These typically hold
the album cover artwork for files down-
loaded from iTunes and similar sources.
Since a
Sd-25
can
ʼ
t use album
artwork, it simply takes up addi-
tional storage space, delays the
time it takes a SoundFile to start
playing, and (in the worst case),
will keep a SoundFile from playing
at all. Most audio programs (in-
cluding iTunes, Audacity, etc.)
have an option to delete
ʻ
id3
ʼ
tags.
Speaker Outputs:
The
Sd-25
ʼ
s
amplifier is a
ʻ
Class-
D
ʼ
design. Its efficiency is near
90%. If you feed 50
Watts of 24 vdc into the
Sd-25
ʼ
s
amplifier, you
will get almost 50 Watts
into your speakers.
ʻ
Linear
ʼ
amplifiers have only
about 20% efficiency.
Fully 80% of the power
you put into them goes
into the heatsink as waste
heat. A 50 Watt linear ampli-
fier would only feed 10 Watts of power into your
speakers, and 40 Watts into the heatsink. This
makes the
Sd-25
ʼ
s
amplifier roughly equivalent to
what would be a 200 to 250 Watt linear amplifier!
If you are going to run your speakers at high SPLs,
you will need to select speakers that can handle at
least
125 to 150 Watts or more of continuous
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 7 of 32 • © September 4, 2014 • Gilderfluke & Co. • DCM
12-24 vdc
Power
Level
Sd-
Left
Line In
Level
Line In
Level Level
Sd-
Right
Mixer
Right
Mixer
Left
Audio Repeater/Amp
Gilderfluke & Company
Burbank, California
Sd-25
w/DMX
B
Left
Right
Power
12-24
vdc
A
Trigger
Inputs
Speakers
(8
Ω
)
Running
Status
Power Supply
12 to 24 vdc
Optional Line
Level In or
Line Level Out
Switch 'B'
Switch 'A'
