AUDAC SX408A Installation and operating instructions

PROFESSIONAL AUDIO EQUIPMENT
SX408A Active Subwoofer System
User Manual &
Installation Guide
SX408A
AUDAC

AUDAC PROFESSIONAL AUDIO EQUIPMENT
User Manual & Installation Guide
AUDAC
http://www.audac.eu
[email protected]

2
INTRODUCTION..................................................................................................................................................................................................................... 3
ENVIRONMENT ...................................................................................................................................................................................................................... 4
SAFETY REQUIREMENTS ................................................................................................................................................................................................... 5
CAUTION –SERVICING...................................................................................................................................................................................................... 5
OVERVIEW REAR PANEL ................................................................................................................................................................................................... 6
REAR PANEL DESCRIPTION .............................................................................................................................................................................................. 7
AMPLIFIER INDICATOR LED’S......................................................................................................................................................................................... 7
RJ45 REMOTE CONTROL CONNECTION ........................................................................................................................................................................ 7
SATELLITE VOLUME CONTROL ...................................................................................................................................................................................... 8
SUBWOOFER VOLUME CONTROL .................................................................................................................................................................................. 8
BALANCED INPUT CONNECTIONS ................................................................................................................................................................................. 8
SATELLITE OUTPUT CONNECTIONS.............................................................................................................................................................................. 9
POWER SWITCH ................................................................................................................................................................................................................. 10
MAINS POWER CONNECTION ........................................................................................................................................................................................ 10
BLOCK DIAGRAM ............................................................................................................................................................................................................... 11
SX408A SET SOLUTIONS.................................................................................................................................................................................................... 12
FESTA 400 ............................................................................................................................................................................................................................ 12
CONGRESS 400 ................................................................................................................................................................................................................... 13
ADDITIONAL INFORMATION.......................................................................................................................................................................................... 14
PERSONAL NOTES............................................................................................................................................................................................................... 15
Index

3
Introduction
This section briefly describes the possibilities of the SX408A active subwoofer system.
he SX408A is an active powerful tandem ported 150W subwoofer with a special
constructed 8" driver that is capable of producing an incredibly powerful and clear
bass sound. It’s frequency response is as low as 37 Hz at -10 dB, and the frequency
characteristic is very flat from 37 Hz to 120 Hz. This way, the sound coming from
this piece of equipment is absolutely magnificent.
It contains an integrated class H amplifier, which ensures a high efficiency level with very low
distortion. This amplifier delivers an output power of 100 Watt to the subwoofer. Besides
this, it also contains an active crossover network with a frequency of 120 Hz, and two output
channels for powering satellite loudspeakers.
The two amplified satellite outputs deliver a maximum power of 2 x 100 Watt at 8 Ohm or 2
x 160 Watt at 4 Ohm. The minimum load is 4 Ohm.
For protection reasons, a built-in limiter is provided to limit the input signal when necessary.
This limiter consists of three separate stages, one for every channel. This ensures the best
sound quality with the least distortion for optimal performance. Power, Signal and Clip
LED’s monitor the proper working of the integrated amplifier.
Besides the high efficiency of the class H amplifier, the SX408A also contains an automatic
power on/off circuit to ensure the highest energy-efficiency. The volume of the Sub and
satellite channels is individually controllable at the back of the subwoofer with two
potentiometers, and the general volume can be controlled by an external volume control or
wall panel, by connecting it to the built-in RJ45 connector.
This all makes the SX408A a simple but complete solution for a wide variation of fixed audio
installations. The balanced input connections are just as the satellite speaker output
connections made with euro block terminal connectors. There is the possibility to connect
two satellite speakers with an impedance of 8 Ohm on each channel.
T

4
Environment
Do not place this unit in an enclosed environment such as a bookshelf or closet. Ensure
that there is adequate ventilation to cool the unit.
Do not place the unit in environments which contain high levels of dust, heat, moisture or
vibration.
Do not use the unit near water or other liquids. Make sure no water or other liquids can be
spilled, dripped or splashed on the unit.
This unit was developed for indoor use only. Do not use it outdoors.
Do not place objects on top of the unit.
Chapte
r
1

5
Safety Requirements
Always handle the unit with care.
Only use a grounded socket outlet and a power cord with grounding plug to plug in the
unit.
This unit is not a toy. It should not be operated by children.
Do not stick objects through the openings.
Do not open the unit (risk for electrical shock).
CAUTION – SERVICING
This unit contains no user serviceable parts. Refer all servicing to qualified
service personnel. Do not perform any servicing unless you are qualified to do
so.
Note
This product conforms to the following European Standards: EN 50081-1: 1992, EN
50082-1: 1992, EN 60065: 19



6
Overview rear panel
Chapte
r
2
2. RJ45 Remote control connection
1. Amplifier indicator LED’s
3. Satellite outputs volume control
4. Subwoofer volume control
5. Balanced input connections
6. Satellite output connections
7. POWER switch
8. MAINS power connection

7
Rear panel description
1) Amplifier indicator LED’s
There three LED’s monitor the proper working if the integrated amplifier.
-Power LED:
When the power switch is turned on, and the amplifiers mains power connection is
connected to an AC power supply, this indicator will light up to let you know that the
system is ready for operation.
When the LED lights up green, the amplifier is switched on, and ready to rock and roll.
When the LED lights up orange, the amplifier is in stand-by mode. This means that there
is no input signal present. The amplifier will switch automatically ON when an input signal
is applied.
-Signal LED:
This LED illuminates whenever there is a signal present at the input connectors.
-Clip LED:
The SX408A has a built-in limiter that prevents the outputs from overdriving. When the
Clip LED lights up frequently, the level must be reduced, because the maximum power is
reached.
2) RJ45 remote control connection
On this RJ45 connection, an optional VC4008 volume controller can be connected through UTP
cabling. With this volume controller, the general volume of the integrated amplifier can be set, of
both the satellite and subwoofer channels.
UTP CAT5 Cabling

8
3) Satellite volume control
With this dial, the output level of the satellite channels can be set.
The attenuation of the signal can be set between 0dB and -50dB by rotating the dial.
4) Subwoofer volume control
With this dial, the output level of the subwoofer channel can be set.
The attenuation of the signal can be set between 0dB and -50dB by rotating the dial.
It is important to find a good balance between the high and low tones by using
the Satellite and Subwoofer volume controls. The perfect balance will depend
on the application and on the location. For vocal applications there will be a
different ideal balance than for music applications.
5) Balanced input connections
These euro terminal input connections accept a balanced line level input signal. An input signal can
be fed from a mixing console or other signal source.
To connect the system to a music source with balanced XLR output connectors, or with
unbalanced RCA/Cinch output connectors, the connection cables should be connected according
to the following schematics:

9
Balanced:
Unbalanced:
Red
Shield
Tip
Sleeve
6) Satellite output connections
On these euro terminal output connections is the amplified output signal present with a frequency
above 120Hz. Connect these to the satellite speakers.
A total of 4 speakers with an impedance of 8 Ohm can be connected to these output connections.
The total impedance load should not be lower than 4 Ohms.

10
7) POWER switch
Use this switch to turn the SX408A on and off. The signal LED lights up green to indicate when
the SX408A is powered up.
Note: The cabinet will automatically turn off when there is no signal present on the input (after
about 30 seconds).
8) MAINS power connection
This is where you connect the AC line cord to provide AC power to the SX408A’s integrated
amplifier. The input connection is performed using IEC power connectors.
The SX408A is factory default set to be used on 220 – 240 Volt AC mains networks. But it can be
switched to be used on 110 – 120 Volt AC mains networks.
To change the SX408A to be used on 110 – 120 Volt, you
have take out the fuse compartment, and turn it over. To
make sure it is set to the right mains voltage, check if the two
arrows on the fuse department match with the right voltage.
Replace the fuse of the SX408A only with a fuse that matches
the specifications of the original one. (T4A / 250V)
FUSE
220-240V
110-120V

11
Block Diagram
Chapte
r
3

12
SX408A Set Solutions
FESTA 400
4 x WX502 + SX408A
Make sure that the WX502 loudspeakers which will be
used in combination with the SX408A are set to 8 Ohm
impedance.
This can be done by turning the power tap adjustment
screw on the rear of the speaker to 8 Ohm.
Chapte
r
4

13
CONGRESS 400
2 x AXIR + SX408A
Make sure that the AXIR design column speakers which will be used in
combination with the SX408A are switched to Low Impedance (6
Ohm).
This can be done by removing the front cover plate with the
AUDAC logo very carefully. This can be done by pressing on the
upper or lower side of this plate, or by sticking carefully a flat object
under the cover plate (e.g. a small screwdriver). The cover plate must
be coming loose without performing large forces.
After the cover plate is removed, the two power tap selector
switches are visible.
To switch the AXIR to Low impedance, the internal switches of the
speaker must be turned over. To reach the internal switches, the plate
with the two power tap selectors should be removed. This can be done
by loosening the 6 Phillips screws whereby it is attached.
Once these screws are loose, the plate can be carefully removed out
of the speaker. (Be careful with the wiring inside the speaker)
Then you will see that there are two switches provided at the side
of this plate. These switches are meant to convert the speaker for
use in 100V or low impedance applications.
Set these switches to Low Impedance to be used in combination to the SX408A.
After this is done, the speaker can be assembled again as it was originally.
Warning: Make sure that the two switches are always both in the same position.
Make sure that it never occurs that one of them is on 100V and the other is in low
impedance position.
100V 100V
6 ?6 ?
100V 100V
6 ?6 ?

14
Additional Information
Crossover: Lowpass: -3dB 120Hz -6dB 146Hz -24dB/Oct
Highpass: -3dB 110Hz -6dB 83Hz 12dB/Oct
Input impedance: 30k Ohm single ended
30k Ohm balanced differential
Sensitivity: 400 mV clip led on
570 mV max output signal
Max input level : 1V limited by limiter
Rated power: Sub: 100W 8 Ohm 50Hz
THD: < 0.2 80W
Top: 160W 4 Ohm 1kHz
100W 8 Ohm 1kHz
THD: < 0.2 160W
Line power: Standby: 8W 10VA
No music: 18W 21VA
Music: 400W 530VA
Full Power sine wave (load Top 4 Ohm / Sub 8 Ohm)
60Hz: 240W 320VA
1Khz: 600W 740VA
Signal Noise ratio: Sub: -100 dB
Top: -100 dB

15
Personal notes