Groundlift; Lpn-Filter; Selecting The Mode Of Operation And Audio Output Cabeling - Dynacord SL 1200 Owner's Manual

2.6 Groundlift

The ground lift switch allows for eliminating noise loops. When operating the power amplifier together with
other equipment in a rack case, setting the switch to the GROUNDED position is recommended. Set the
switch to UNGROUNDED, when the power amplifier is operated together with appliances with differing
ground potentials.

2.7 LPN-Filter

The patented LPN (Low-pass notch) filter corrects the frequency and phase response of the connected
loudspeakers. This effect can not be reached using equalizers or „Bass-Boosters", because the LPN filter
mainly optimizes the rise time of the audio signal. Switch the filter ON or OFF for evaluation of the actual
effect that the filter has on the sound. The sound is getting more powerful, especially when using fullrange
speakers (e.g. 12/2, 15/2) or subwoofers. For large systems (e.g. controlled via DC's DSP 260) using the
LPN filter is not recommended.

2.8 Selecting the Mode Of Operation and Audio Output Cabeling

The MODE switch on the power amp's rear panel defines how the audio inputs handle the input signals. Possible settings are
DUAL, PARALLEL or BRIDGED.
DUAL
In DUAL mode, the two channels of the power amplifier work independent from each other. This mode of
operation is being used for all 2-channel applications, like stereo operation. Using the input level controls
on the power amp's front panel allows independently adjusting the channels' amplification.
PARALLEL
In PARALLEL mode, the inputs of channel A and channel B are directly electrically linked. The audio
signal has to be applied to the input connectors of channel A. Using the input level controls to
independently control the amplification of the two channels is still possible because only the channels'
inputs are linked. PARALLEL operation is the mode of choice, whenever the same input signal drives
multiple power amp channels of a large system installation.
CAUTION:
In PARALLEL mode, the input signal has to be fed to input channel A only.
Typical Speaker System Cabling
The first possibility in DUAL or PARALLEL mode
is to use the two Speakon-type connectors,
whereas speakers have to be connected to pins
1+ and 1– of the sockets. The correct connection
is also indicated at the amplifiers rear panel.
Bi-Amp Cabling
The second possibility for connecting the speakers when the
power amplifier is operated in DUAL or PARALLEL mode is to
only use the Speakon-type connector CHANNEL A and to
connect one speaker cabinet to pins 1+ and 1–, as described
above and the second cabinet to pins 2+ and 2– as shown in
illustration. Only pins 2+ and 2– of the Speakon CHANNEL A
connector are assigned. Proceeding like this facilitates the cabling
of speaker systems that are used in active 2-way operation (Bi-
Amp). The correct connection is also indicated at the amplifiers rear panel.
STANDARD PRECISION SERIES
Owner's Manual 9