SERIE DS-Active Power
SERIES
Manual del usuario /
User's manual
13
cooling. In normal use, the amplifier panel will be warm to the
touch.
If the unit stops playing (or just the mid-high or the bass
sections), the amplifier’s overheating protection may be
activated to protect the components from thermal damage.
Overheating may be due to insufficient cooling, or to very
aggressive use in extremely hot conditions. Do not use the
unit in proximity to high power lights.
Once the amplifier cools down, it switches back on
automatically. If the unit should shut down again, try reducing
the volume a notch to avoid overheating.
3.5 Low mains voltage
If mains voltage falls below the shutdown voltage for the unit,
it will stop playing. When acceptable levels are regained, the
unit will switch back on automatically.
4. CONNECTIONS
Signal wiring
There are two basic ways to transport an audio signal with
microphone or line level:
Un-balanced line: Utilising a two-conductor cable, it transports
the signal as the voltage between them. Electro-magnetic
interference can get added to the signal as undesired noise.
Connectors that carry un-balanced signals have two pins,
such as RCA (
Phono) and 1/4” (6.35 mm, often referred to as
jack) mono. 3-pin connector such as XLR (Cannon) may also
carry un-balanced signals if one of the pins is unused.
Balanced line: Utilising a three-conductor cable, one of them
acts as a shield against electro-magnetic noise and is the
ground conductor. The other two have the same voltage with
respect to the ground conductor but with opposite signs. The
noise that cannot be rejected by the shield affects both signal
conductors in the same way. At the device’s input the two
signals get summed with opposite sign, so that noise is
cancelled out while the programme signal doubles in level.
Most professional audio devices use balanced inputs and
outputs. Connectors that can carry balanced signal have three
pins, such as XLR (
Cannon) and 1/4” (6.35 mm) stereo.
We recommend the use of balanced wiring with the DS Active
Power series. The illustrations on Appendix 1 of this manual
show the recommended connection with different types of
connectors to balanced processor or amplifier inputs.
The system can be used as a full range system, or with
subwoofer reinforcement:
Stand alone full-range use connection
Simply plug the mixer output into the enclosure’s input. If you
have more than one box per channel, use the
LOOP THRU
output to link the signal from one box to the next as shown.
Powered sub-woofer reinforcement connection
To use it in combination with a self-powered subwoofer (such
as the DAS SUB-18A), plug the mixer into the subwoofer, and
connect the satellite output to the DS-112A/115A. If you have
more boxes per channel, simply daisy chain DS-112A/115As
and subwoofers as shown.
Passive sub-woofer reinforcement connection
The DS-15A can be complemented by a passive subwoofer
unit such as the D.A.S. SUB-18F. You will need a power
amplifier and a two-way stereo electronic crossover unit, such
as a D.A.S. CT-1, crossing over at a frequency in the 100-160
Hz range. The graph shows an example of a connection using
a passive (non-powered) subwoofer.
Loop thru
The
LOOP THRU output is an output XLR in parallel with the
input connector and is useful for daisy chaining the input
signal to a number of boxes, connecting them in parallel.
The number of units that can be linked this way depends on
the output impedance of the equipment driving the enclosure,
such as the mixer or processor. Typically, to avoid signal
degradation, the maximum number that can be daisy chained
is given by the formula (1250/Z), where Z is the output
impedance of the equipment driving the enclosure. For
instance, a 100 ohm output impedance allows daisy chaining
12 boxes.
