10 | K Series | User guide
7 : 6.2. Internal signal path polarity
In order to increase the power’s supply energy storage
efficiency, signals coming from each channel pairs are po-
larity reversed, one with respect to the other within the pair,
when entering the amplifier. This ensures a symmetrical use
of the voltage rails: if, for example, both channels’ 1 and 2
input signals are going through a peak at the same time,
channel 1’s energy will come from the positive voltage rails
while channel 2, whose polarity is reversed with respect to
channel 1, will be fed energy from the negative voltage rails.
In this manner, the power supply will work symmetrically,
with one channel catered by the positive rails and the other
by the symmetrical negative rails. Channel 2’s signal will be
polarity reversed once more at the output connectors to
ensure that both channels output with the same polarity as
their corresponding input signals.
7 : 7.V Ext
The V Ext terminal is used to remotely manage the DSP
in K Series DSP amplifier and enable remote on/off.
K Series provided with a KAESOP board have a dedicat-
ed 2 pin Phoenix connector MCV 1,5/ 2-G-3,81 - 1803426
located near the rear Ethernet ports. K Series with the RS-
485 serial port implement the V Ext connection on pin 2 (pin
7) of the RJ45 rear connector (ref.
FIGURE 15
).
When the V Ext port is powered by and external 12 V
DC
(1 A max) power supply, the internal controller allows to con-
trol the DSP – if present – even without AC mains supply,
and allows serial communication – via RS-485 or ethernet
communication in KAESOP equiped models – for remote
on/off via the Armonía Pro Audio Suite software.
7 : 8.RS-485 connection
K Series amplifiers without an optional KAESOP board
can be remotely controlled via an RS-485 connection.
Remote connection data cables must have an 8P8C
modular plug – namely RJ45 plug – to be inserted in the
rear port labelled “DATA PORT”.
By plugging an RJ45 plug and selecting the unit’s remote
ID via the rotary trimmers, the amp is ready to be remotely
controlled. Please note that ID numer 00 is not allowed.
The recommended arrangement of the connections is a
series of point-to-point (multidropped) nodes – i.e. a line or
bus. Ideally, the two ends of the line should be terminated
with a resistor, typically 120 � for twisted pairs. Powersoft
recommend the use of Ethernet Cat5 straight through –
patch
– cables with pin/pair assignments TIA/EIA-568-B,
i.e. T568B (ref.
TABLE 1
).
first polarity
inversion
second polarity
inversion
Channel 1
input
Channel 2
input
Channel 1
output
Amp
Channel 2
output
FIGURE 13: Internal signal path polar-
ity with example input signals. Both channels
1 and 2 are fed the same sine signal.
FIGURE 14: V Ext phoenix connector MCV 1,5/ 2-G-3,81.
1
–
+
V
ext
GND
2 3 4 5 6 7 8
FIGURE 15: Front view of the RJ45 connector
with T568 B wiring: RS-485 pinout.
FIGURE 16: RJ45 (8P8C) plug.
FIGURE 17: Data port and ID selectors for serial con-
nection; note that ID numer 00 is not allowed.
