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STA-400D
Digital stereo PA amplifier
These instructions are intended for users without
any specific technical knowledge . The speakers,
however, should only be connected by persons
with the corresponding technical knowledge .
Please read these instructions carefully prior
to operating the unit and keep them for later
reference .
1 Operating Elements
and Connections
1 LED CLIP, one each for the left and right
amplifier channels
When the LED lights up to indicate overload
of the channel, turn back the corresponding
volume control (2) .
2 Volume control, one each for the left and
right amplifier channels
3 LED PROTECT, will light up in case of mal-
function, e . g . overheating or short circuit at
one of the speaker terminals (10, 11)
4 Power LED ON
5 POWER switch
6 Mains jack for connection to a socket
(230 V/ 50 Hz) via the mains cable provided
7 Support for the mains fuse
Always replace a blown fuse by one of the
same type .
8 Signal input via XLR jacks (bal .)
9 Signal input via RCA jacks
10 Speaker outputs
(4 mm jacks with screw terminals)
11 Speaker outputs (SPEAKON jacks)
2 Safety Notes
This unit corresponds to all relevant directives of
the EU and is therefore marked with
WARNING This unit uses dangerous mains
voltage . Leave servicing to skilled
personnel only and do not insert
anything into the air vents . In-
expert handling may result in
electric shock .
•
The unit is suitable for indoor use only . Protect
it against dripping water and splash water,
high air humidity and heat (admissible ambi-
ent temperature range: 0 – 40 °C) .
•
Do not place any vessel filled with liquid on
the unit, e . g . a drinking glass .
•
The heat generated inside the unit must be
dissipated by air circulation; never cover the
air vents of the housing .
•
Do not operate the unit or immediately dis-
connect the mains plug from the socket
1 . if the unit or the mains cable is visibly dam-
aged,
2 . if a defect might have occurred after the
unit was dropped or suffered a similar ac-
cident,
6
L-CH
CLIP
0
10
1
2
3 . if malfunctions occur .
In any case the unit must be repaired by skilled
personnel .
•
Never pull the mains cable to disconnect the
mains plug from the socket, always seize the
plug .
•
For cleaning only use a dry, soft cloth; never
use water or chemicals .
•
No guarantee claims for the unit and no liabil-
ity for any resulting personal damage or mate-
rial damage will be accepted if the unit is used
for other purposes than originally intended, if
it is not correctly connected or operated, or if
it is not repaired in an expert way .
If the unit is to be put out of operation
definitively, take it to a local recycling
plant for a disposal which is not harmful
to the environment .
3 Applications
This digital stereo PA amplifier (class D) is spe-
cially designed for applications on stage and
in discothèques . When 4 Ω speakers are con-
nected, the RMS output power of the amplifier is
2 × 270 W (STA-400D) or 2 × 400 W (STA-800D) .
To ensure sufficient cooling, the amplifier
is equipped with two temperature-controlled
and silent fans . Due to its design as a class D
amplifier and a switch-mode power supply, the
amplifier offers high efficiency, compact size
and small weight .
4 Setting Up
The amplifier is designed for installation into a
rack (482 mm / 19"), but it can also be placed on
a table . To ensure sufficient cooling, air must al-
ways be able to flow freely through all air vents .
4.1 Installation into a rack
.
For installation into a rack, screw the two
mounting brackets provided to the left and right
sides of the housing (fig . 3) . In the rack, the
ampli fier requires a height of 1 RS (rack space
= 44 .45 mm) .
The hot air given off by the amplifier must
be dissipated from the rack; otherwise, heat
will accumulate in the rack which may not only
damage the amplifier but also other units in
the rack . In case of insufficient heat dissipation,
install a ventilation unit into the rack .
STA-400D
R-CH
ON
PROTECT
CLIP
0
10
3 4
2
1
5 Connecting the Amplifier
Prior to making or changing any connections,
switch off the amplifier and the units to be con-
nected .
1) Feed the input signal for the amplifier to the
2) The highest output power is obtained when
3) Use the mains cable provided to connect the
L-CH
ON
CLIP
PROTECT
0
10
XLR jacks (8) or to the RCA jacks (9): At these
jacks, connect, for example, the output of
a preamplifer or of a mixer . The balanced
XLR jacks should be preferred, especially with
long connection cables, because a balanced
signal transmission will provide the best inter-
ference suppression . The input signal should
have line level .
4 Ω speakers are connected . However, it is
also possible to connect 8 Ω speakers which
will slightly reduce the output power . The
minimum RMS power capability of the speak-
ers must be as follows:
STA-400D
4 Ω speaker
270 W (RMS)
8 Ω speaker
180 W (RMS)
Connect the speakers to the 4 mm jacks (10)
with additional clamp connection for stripped
cables or to the SPEAKON jacks* (11) con-
nected in parallel . To prevent overload of the
amplifier, only use speakers with a minimum
impedance of 8 Ω when connecting speakers
both to the 4 mm jacks and to the SPEAKON
jacks .
* Contact configuration of a plug, see chapter 7 .1
After inserting a plug into the jack, turn the plug
clockwise until it engages . To remove the plug,
pull back the latch on the plug and turn the plug
counter-clockwise .
When using the 4 mm jacks, always connect
the marked core of the speaker cables to a
red jack .
Different possibilities for connecting multiple
speakers to one channel can be found in fig .
4 which also shows the minimum load of
the speakers . When interconnecting multiple
speakers, always observe the correct positive
and negative connections and make sure that
the total impedance is at least 4 Ω .
mains jack (6) of the amplifier to a socket
(230 V/ 50 Hz) .
R-CH
CLIP
POWER
0
10
POWER
5
➀
ST-800D
400 W (RMS)
210 W
(RMS)
➂
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