Specifications subject to change. | ©2021 Procella Audio Svenska AB, Procella Audio USA, LLC. All rights reserved. | V1.0 2021/08 7
Connections
6. Connections
Note: The micro USB socket located
on the amplifier rear panel is
present for service and diagnostic
purposes only.
The Procella DA4280 amplifier
rear panel connection sockets are
illustrated in
Diagram 3.
6.1 Mains Power Connection
The Procella DA4280 amplifier has
a power factor corrected universal
power supply and can be used with mains input voltage from
100V AC to 240V AC, 50/60Hz. Use the mains cable supplied
with the amplifier and connect it to a switched mains supply.
The power consumption of the Procella DA4280 amplifier is
300W.
The Procella DA4280 amplifier has no mains power switch and
are operational as soon as mains power is connected. Ensure that
all signal, GPIO and output connections are made and that all DIP
switch options are selected appropriately before connecting the
amplifier to mains power.
6.2 Input Connections
The Procella DA4280 amplifier inputs are of balanced, line level
format with a full output power sensitivity of +5.5dBu in 8Ω and
Hi-Z mode and +2.5dBu in 4Ω mode. Input signal levels up to
+24dBu can be handled without input clipping.
Input connections to the the Procella DA4280 amplifier are
achieved via male ‘Euro Block’ connectors. Connecting cables to the
supplied female
input
connectors is illustrated in
Diagram 4a.
6.3 Output Connections
Output connections from the Procella DA4280 amplifier are
achieved via male ‘Euro Block’ connectors. Ensure that speaker
connection polarity is correct throughout the installation: positive
(+) amplifier terminals should always be connected to positive
speaker terminals and negative (–) amplifier terminals always
connected to negative speaker terminals.
No bridge mode
- The Procella DA4280 employs an inherently
bridged Class D output topology; therefore, an alternate bridge
mode output connection should NOT be used, even when only one
loudspeaker (such as a subwoofer) will be connected. Under no
circumstances should the amplifier connection be bridged, as this
may cause undesired operating performance or damage.
Together with DIP switch configuration, the output connector
blocks provide connection options that enable channel
Cable Gauge Table
Low-Z installations. 8Ω loads
independent selection of Hi-Z or Low-Z mode. Connecting cables
to the supplied female
output
connector, and the selection of Hi-Z
or Low-Z connection options, are illustrated in
Diagrams 4b and 4c
respectively
.
6.4 GPIO Connections
If any GPIO functionality is required, cables will need to be
connected to the supplied GPIO connector. Connecting cables to
the supplied female GPIO connector is illustrated in
Diagrams 4d
.
6.5 Speaker Cable Gauge
Speaker connection cable gauge should be chosen appropriately
to reflect the type of installation. The adjacent tables specify the
appropriate cable gauge for less than 0.5dB cable loss with different
installation types and cable lengths.
Cable Cross Section
(mm
2
)
Cable Gauge
(US)
Max Cable Length
(metres, 8Ω load)
2.5
≈
14
up to25m (80’)
4.0
≈
12
25 - 45m (80’ - 150’)
100 - 240 VAC
~
50 - 60Hz / 150W
AC MAINS
INPUT
GPIO
DIP
8
7
6
5
4
3
2
1
V12
V34
VCC
STB
GPO
CH1
CH3
CH2
CH4
MAINTENANCE
CH1
CH3
CH2
CH4
OUTPUT
CLASS 2
WIRING
CLASS 2
WIRING
HiZ
HiZ
NC
LoZ
LoZ
DESIGNED AND ENGINEERED IN DENMARK - MANUFACTURED IN CHINA
Input
Channel 1 & 2
Output
Channel 1
GPIO
Input
Channel 3 & 4
Output
Channel 2
Output
Channel 3
Output
Channel 4
