QUICK START
(3) Expansion slot
This slot is used for extra audio inputs and remote control. See further in the manual for
details about the available options.
Since July 2009, all NXAMP4x1s and NXAMP4x4s are shipped with an expansion card fitted
in, the NX-DFLT card. This card prevents output noises when main AC power feeding
NXAMPs is brutally shutdown. NX-DFLT card should always be fitted in when no other
expansion card is used. The “Presence” LED on the NX-DFLT card shows that the card is
running properly. It will light when the amplifier is powered ON (also in Stand-by mode).
(4) Power outputs
Use Neutrik NL4 cable plug into these ports for safely connecting the power amplifier
outputs to the cabinets.
In LOAD2_52, the output routing is always done this way for 4 channels mode:
1+
1-
2+
2-
Speakon A
Speakon B
1+
1-
2+
2-
CH1
CH2
1+
1-
2+
2-
Speakon C
Speakon D
1+
1-
2+
2-
CH3
CH4
Please note the symmetry between speakon A/B and C/D. Also you can notice
that Speakon B is always reverse of Speakon A (and same for D and C).
In LOAD2_52, the output routing is always done this way in bridge mode:
1+
1-
2+
2-
Speakon A
Speakon B
1+
1-
2+
2-
CH1+
CH1-
1+
1-
2+
2-
Speakon C
Speakon D
1+
1-
2+
2-
CH3+
CH3-
Gray lines shows the points of the speakon physically connected to the amplifier output but
unused.
(5) RS-232 port
Through this serial port, you can upload a new firmware into the NXAMP from a computer.
New firmware adds new functionalities and new cabinets’ setups. Details about the update
procedure are given further in this manual.
(6) GPIO port
This GPIO port is used for interfacing the amplifier to security system, or to allow a basic
remote control of the unit.
PAGE 17 OF 91
