NTI PA3 User Manual
www.nti-audio.com Sep 17, Page 1 / 5
The portable PA3 Amplifier includes an equalized pink noise
generator to drive the omnidirectional dodecahedron sound
source (dodec) with an acoustically flat frequency response.
NOTE Always wear an appropriate ear protection
when using the PA3 with a sound source.
Standard Operation
1. Connect the PA3 to the dodec via 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 requested test
signal => the selected Signal Source LED glows green
5. Press the ‘Signal ON’ button, or the button on the keyfob
to unmute / mute the PA3 => the ‘Signal ON’ button glows
green (unmuted) / red (muted)
6. Adjust the Dodec loudspeaker volume via the ‘Level’ control
Signal Source Selection
EQ Pink Internal equalized pink noise for acoustically flat •
frequency response (= default) of the DS2 Dodec
EQ Line The default equalization for the DS2 is applied on •
the Line IN signal
Preset 3 Internal Pink Noise with no equalization (for maximum •
output power)
Preset 4 The Line IN signal is amplified, but not equalized•
Preset 5 unused (•
available on request for customized signal
)
Line IN / Subwoofer Operation
Line IN Connect the external signal generator to the PA3
by using an XLR cable and select the Signal Source
‘EQ Line’ or ‘Preset 4’
Subwoofer Connect the PA3 to an active subwoofer by using an
XLR cable and press the ‘Subwoofer ON’ button =>
the ‘Subwoofer ON’ button glows green
Power Amplifier PA3
Dodecahedron Speaker Set
Omnidirectional Sound Source & Amplifier
Remote control for PA3
Dodecahedron Speaker DS2
USER GUIDE
100-240VA C / 50-60Hz / 850W
Fuse 5*20mm / T6,3A
Speaker
OUT
O
I
Signal ON
Line IN Subwoofer
ON
Protect
Clip
LevelSignal Source
EQ Pink
EQ Line
Preset 3
Preset 4
Preset 5
All information subject to change without notice.
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 too high B.
The amplifier output is oscillatingC.
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)
Clip Distorted output signal The input signal level is too high Reduce the Line IN signal volume
(none) Amplifier audibly reduces the
output volume (
Note: this is a
protection feature
)
D. The input signal is overloading the
amplifier
E. The impedance of the output load is
too low (i.e. output power too high)
D. Select another test signal
Reduce the Line IN signal volume
E. Verify or modify the load
Check for external short circuit
Mains power switch Mains power socket
Output for dodec loudspeaker
PA3 rear panel
Mute / Unmute
amplifier output
Input for external
signal generator
Signal selection
Subwoofer ON
Output level control
Output for subwoofer(
factory use only
)
PA3 front panel
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USER GUIDE
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