USER GUIDE
Dodecahedron Speaker Set
Omnidirectional Sound Source
Comprised of the DS3 Dodecahedron Loudspeaker and the
PA3 Power Amplifier, the set generates a Pink noise signal
with an acoustically-flat frequency response.
NOTE Always wear an appropriate ear protection
when using the speaker set.
DS3 Dodecahedron Loudspeaker
PA3 Power Amplifier
Standard Operation
1. Connect the PA3 to the DS3 with the supplied Speakon cable
2. Connect the PA3 to AC mains power and switch it on => the
Signal ON button glows red (amplifier is muted)
3. Attach the remote control antenna to the PA3
4. Press the Signal Source button to select the required test
signal => the selected Signal Source LED glows green
5. Press the Signal ON button, or the button on the remote control to unmute / mute the PA3 => the Signal ON button glows
green (unmuted) / red (muted)
6. Adjust the DS3 volume using the output level control
Signal Source Selection
EQ Pink Internal equalized Pink noise for acoustically-flat •
frequency response (
EQ Line Enables Line IN socket. Any external input signal is •
processed with the default DS3 equalization
Preset 3 Internal Pink noise without equalization •
(
Preset 4 Enables Line IN socket without equalization•
Preset 5 unused (•
for maximum output power from the DS3
available on request for a customized signal
→ see page 3, footnote 3
)
)
)
Line IN Socket
Connect an external signal generator to the PA3 with an XLR cable
and select the Signal Source EQ Line or Preset 4.
Remote control for PA3
Subwoofer Operation
Connect the PA3 to an active subwoofer with an XLR cable. Press
the Subwoofer ON button => the Subwoofer ON button glows
green .
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USER GUIDE
Warning LEDs, Troubleshooting
Warning LED Issue Root cause Countermeasure
Protect Amplifier output is muted The output current of the amplifier is A.
too high
Temperature inside amplifier is too B.
high
The amplifier output is oscillatingC.
Clip Distorted output signal The input signal level is too high Reduce the Line IN signal volume
(none) Amplifier audibly reduces the
output volume (
protection feature
Note: this is a
)
D. The input signal is overloading the
amplifier
E. The impedance of the output load is
too low (i.e. output power too high)
Output level control
A. Verify the connected cable / load.
Switch OFF the amplifier for >20 sec.
B. Let the amplifier cool down.
Verify that the built-in fan is operating.
C. Check the compatibility of the speaker
(i.e. verify the load impedance).
D. Select another test signal.
Reduce the Line IN signal volume.
E. Verify or modify the load.
Check for external short circuit.
Mute / Unmute
amplifier output
Input from external
signal generator
Mains power switch Mains power socket
Signal ON
Line IN Subwoofer
factory use only
LevelSignal Source
Protect
Clip
EQ Pink
EQ Line
Preset 3
Preset 4
Preset 5
)
Output to subwoofer(
PA3 front panel
O
I
100-240VA C / 50-60Hz / 850W
Fuse 5*20mm / T6,3A
Speaker
OUT
Signal Source button
Subwoofer ON
ON
Output to dodecahedron loudspeaker
4-wire connection for DS3 loudspeaker 2-wire connection (Bridge mode)
www.nti-audio.com
PA3 rear panel
1+
1–
2–
2+
1+
2–
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