D.A.S. Audio DR Active Series - Manual (Page 12)

6
CONNECTIONS
Unbalanced line
Balanced line
Signal wiring
Stand alone full-range use connection
There are two basic ways to transport an audio
signal with microphone or line level:
: 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.
: 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 . The illustrations on
Appendix 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:
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.
DR active series
Powered sub-woofer reinforcement
connection
To use it in combination with a self-powered
subwoofer (such as the ), plug the mixer
into the subwoofer, and connect the satellite
output to the
. If you have more
boxes per channel, simply daisy chain
s and subwoofers as shown.
sub-18HA
DR-112A/115A
DR-
112A/115A
P a s s i v e s u b - w o o f e r re i n f o rc e m e n t
connection
The system can be complemented by a
passive subwoofer unit such as the . You
will need a power amplifier and a two-way stereo
electronic crossover unit, such as a
,
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.
sub-18HF
DSP-26
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.
EN
Manual del Usuario User’s Manual / DR active /