How do I cable NXAMPs and DPU using GPIO MODE 6&7?
1.
First you have to define the ratio of normal and backup amplifier, for example 1:5, meaning you have one
backup amplifier for five normal amplifiers.
2.
Connect the GPOutput1 of each normal amplifier to the corresponding Backup NXAMP GPInput from 1 to 5.
Connect all the GPInput1 of each normal amplifier to the GPOutput1 of the backup amplifier. Connect GND pins
together to every amplifier.
3.
Then connect Speakons from each Normal NXAMPs A and C outputs to DPU’s SP4-2 and SP4-1 front connectors.
Then connect the Backup NXAMP A and C output to the first DPU’s SP4-4 and SP4-3 front connectors. Then link
DPU together using speakon8 and speakon4. Use Spekon8 connectors to link the backup power from the first
DPU’s SP8-2 connector to second DPU’s SP8-2 connector. If you get more than two normal amplifiers, then link
the second DPU’s SP4-3 and the SP4-4 front connectors to the third DPU’s SP4-3 and SP4-4 front connectors.
And continue to do so to the fifth DPU.
4.
The two connectors used for outputting power from the redundant system to the speakers are named ‘INPUT C’
and ‘INPUTA’ and are located at the back of the DPU. Connect your speakers to the correct DPU, meaning that
the preset used in the DPU’s host NXAMP is dedicated for the connected speakers.
5.
Now that GPIO is connected as well as power SPEAKON, connect each DPU’s RS232 port to their host NXAMP’s
one, using “Cross cable” or “Null modem” cables.
6.
Then connect the mains to all NXAMPs and DPU, using POWERCONs and IEC cables.
7.
Power on all the NXAMPs and DPUs.
8.
Then,
create “scenes” or “user presets” in the back up amplifier
that contain a copy of each normal
amplifier
parameters and speaker setup
. Go to the backup NXAMP menu, 4.Save/Recall=> save; choose the
scenes name, example 00“nxamp1”, 01“nxamp2” …and save. Memory spaces 00 to 04 are dedicated for
redundancy using GPIO MODE 6. When all normal amplifiers parameters are copied and saved in the backup
amplifier put the backup amplifier in GPIO mode 6 and all normal amplifiers in GPIO mode 7. Regarding NXAMP
audio input patch and “user preset”, see page 11.
WARNING:
Be sure that each normal amplifier’s GPOutput is connected to the correct Backup NXAMP GPInput,
wrong connection will lead to wrong scenes recalls in the backup amplifier.
INFO:
Linking DPU is possible because all SP4-1 and SP4-2 points are paralleled with the SP8-1 connectors and all
SP4-3 and SP4-4 points are paralleled with the SP8-2 connectors.
IMPORTANT:
In normal operation mode ‘INPUT C’ and ‘INPUT A’ DPU’s back connectors are pure copy of the host
NXAMP’s ‘OUTPUT C’ and ‘OUTPUT A’ connectors. When DPU switch from his host amplifier to the backup amplifier
‘INPUT C’ and ‘INPUT A’ become pure copy of the backup NXAMP ‘OUTPUT C’ and ‘OUTPUT A’ connectors.
NOTE:
if you save parameters somewhere else than in memory space 00 to 04, the backup amplifiers won’t be able to
recall your backup scenes when needed.
1+
1-
2+
2-
3+
3-
4+
4-
S1
NL8MD
1+
1-
2+
2-
S2
NL4
1+
1-
2+
2-
S3
NL4
SPK8-1
SPK4-1
SPK4-2
1+
1-
2+
2-
3+
3-
4+
4-
S4
NL8MD
1+
1-
2+
2-
S5
NL4
1+
1-
2+
2-
S6
NL4
SPK8-2
SPK4-3
SPK4-4
