Gilderfluke & Co Sd-25 w/DMX страница 8 Скачать руководство пользователя

Страница: 8 / 32

power

. Speakers smaller than this may clip or be

damaged if run at too high an output power level
from the

Sd-25

The amplifier outputs from the

Sd-25

can be used

with  speakers of  eight  ohms (or  higher) impedance,
or  four  ohms  when  bridged.  As  with  any  amplifier,
you  can  series/parallel  a  number  of  speakers,  so
long as the impedance remains within these limits.

In  rare  cases  your  speaker  may  clip  out  at  an  un-
usually  low  level.  This  may  be  that  the  protection
circuitry inside the crossover is confused by  the digi-
tal output of the

Sd-25

amplifier. If this is the case,

we have a small filter modules that can filter the high
frequency spikes the speaker receives.

The

Sd-25

amplifier is well protected from short

circuits and overheating. You can stick a screwdriver
right across the speaker terminals. The amplifier will
instantly turn off. The

Sd-25

amplifier will go back

to work an instant after a fault is removed.

If  the  speaker  impedance  is  too  low  and  you  are
running  at  a  high  volume  level,  the  amplifier  may
start  to  cut  out.  If  you  hear  this,  check  the  power
supply  voltage.  If  the power  supply voltage is  drop-
ping,  you  might  simply be  drawing too much  power
for  the  power  supply  and  a  larger  supply  may  fix
your  problem.  If  the  power  supply  is  OK,  and  you
can

t increase the speaker impedance, then you

might simply be asking too much of the

Sd-25

amplifier, and need to turn down the volume a tad.

If  you  wish  to comply with  FCC  and  CE  standards
for  radio  frequency   emissions,  you  should  use
shielded  speaker  wires  with  the

Sd-25

. The shield

should be attached to a good

Earth

ground. If no

Earth

ground is available, then attach the shields to

the

negative

power supply terminal, which is im-

mediately adjacent  to the speaker
terminals.  This  will  not  effect  the
sound  quality from  the

Sd-25

, but

will  make  the  FCC   and  CE  folks
happy.  Shielded  speaker  lines
were  used during all  CE/FCC  cer-
tification testing.

Bridged Amplifier:

If you need a mono output with
more

oomph

, then amplifier in

the

Sd-25

can be

bridged

Bridging will only have an effect

Bridged Wiring

Left

Right

Power

12-24

vdc

Speakers

)

with lower impedance speakers (4 ohms). You won

hear a bit of difference if you are using an 8 ohm
speaker. The only audio which is amplified comes
from the

left

sources (mixer and repeater). The wir-

ing to

bridge

the amplifier is a little different from

what you might be used to on a  linear  amplifier. The
speaker  is wired in  parallel  to both  speaker  outputs
as  shown  in  the  drawing,  and  the

Stereo/Bridged

switch on the bottom of the

Sd-25

is moved to the

Bridged

position.

Wiring the speak-
ers for a

Bridged

o u t p u t w i t h o u t
t h r o w i n g t h e

S t e r e o / B r i d g e d

s w i t c h t o t h e

Bridged

position

can damage the
Sd-25

s amplifier

DMX-512 Inputs:

The  DMX-512  connections  are  through  two  RJ-45
connectors. These are the eight position, eight  con-
ductor  plugs typically used for  ethernet cables. They
are also used for  DMX-512. The pinout of the DMX-
512 connectors follows the USITT wiring standards:

Pair

Wire #

Color

Function

DMX-512 Pin

Pair 2

White / Orange

Data 1+

DMX-512 Pin 3

Orange

Data 1-

DMX-512 Pin 2