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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
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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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Specifications PA3
Maximum short-period output power 2 x 350 W into 2x 3 W | 2 x 260 W into 2x 4 W (@ 1 % THD)
Maximum continuous output power1)
with external Sine signal @ 0 dBu and
THD ≤ 0.12 % from 20 Hz to 22 kHz,
or with internal Pink Noise2) @ max. level
2 x 160 W into 2x 3 W | 2 x 120 W into 2x 4 W
Protection Dynamic compressor, temperature, overcurrent, DC, excessive clipping
Output connector 4-pin Speakon (channel 1: 1+/1– | channel 2: 2+/2–)
THD typ. 0.017 % @ 2 x 150 W into 2 x 3 W, 1 kHz
Level flatness +0 / –3.3 dB3) @ 20 Hz to 20 kHz
Signal-to-noise ratio ≥ 86 dB, bandwidth 22 kHz
Damping factor ≥ 120 @ load ≥ 3 W and f < 2 kHz
Voltage gain Muted | Level adjustable from –18 dB to 29.0 dB
Line IN
Input connector
Input sensitivity
Maximum input level
Input impedance
XLR symmetric
0 dBu for specified output power into 2 x 3 W (max. gain)
20 dBu / ±11 Vp
10 kW symmetric
Subwoofer OUT
Output connector
Voltage gain
Maximum output level
Output impedance
Filter
XLR symmetric
3 dB
18 dBu / ±8.72 Vp
≤ 600 W symmetric
Lowpass 120 Hz Butterworth 24 dB / Octave (4th order); additional highpass at amplifier output will be automatically activated when the Subwoofer is switched ON
Signals (selectable)
EQ Pink
EQ Line
Preset 3
Preset 4
Preset 5
Internal noise generator, equalized pink noise (Cf = 2.5)
External signal, equalized
Internal noise generator, pink noise without equalization (Cf = 3.6)
External signal, without equalization
Custom specific (
available on request
)
Equalization of Dodecahedron DS2
1/3 Octave
1/1 Octave
Flat acoustic frequency response from 100 Hz to 8 kHz
100 dB re 1 pW ±4 dB
105 dB re 1 pW ±3 dB
Warning LEDs
Clip
Protect
Line IN input
amplifier automatically switches the output OFF at high temperature, overcurrent etc.;
with auto-retry function
Controls
Signal ON
Level
Signal Source
Subwoofer ON
ON/OFF switch with green/red LED
Knob for gain control
Switch for selection of output signal
ON/OFF switch with green LED
Remote control Amplifier output ON/OFF
Sender frequency 433.92 MHz; conforming to R&TTE standard 1999/5/EG and
State Radio Regulation of China
CE conformity EMV acc. EN61326-1:2006 / harmonized standards: EN61000-4-x, EN55011:2009
Weight 5 kg (11 lbs)
Dimensions (L x W x H) 358 x 173 x 245 mm (14.1” x 6.8” x 9.7”)
Mains supply 110 to 240 VAC, 50/60 Hz, 550 W typical power consumption
Fuse T6.3 A (5 x 20 mm)
Temperature range 0° to +50°C (32° to 122°F)
Humidity range ≤ 90% RH (non-condensing)
Accessories (included) Remote control
Order information NTi Audio # 600 000 506 (Europe) / 600 000 510 (USA)
1)
: Without filtering
2)
: Internal Pink Noise with Crest factor Cf = 3.2 @ maximum output power
3)
: Without equalization, with 20 kHz Butterworth high pass (24 dB damping factor)
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USER GUIDE
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Specifications DS2
Standards ISO16283, ISO140, ISO3382, ISO354, DIN52210, ASTM-E2235/-E336/-E90
Nominal impedance 2x 3 W
Maximum sound power
4)
Level decay after 1 h continuous operation @ maximum power
300 W
1.2 dB
Maximum peak power 1’000 Wp
Maximum sound pressure level 122.5 dB re 1 pW @ PA3 Presets 3, 4
Equalized sound pressure level
1/3 Octave
1/1 Octave
PA3 amplifier output adjusted for acoustically equalized signal at Dodecahedron DS2
100 dB re 1 pW ±4 dB from 100 Hz to 8 kHz
105 dB re 1 pW ±3 dB from 125 Hz to 8 kHz
Bandwidth 50 Hz to 10 kHz
Input connector Speakon (channel 1: 1+/1– | channel 2: 2+/2–)
Number of speakers 12 pcs. à 5”, in dodecahedral configuration
Weight 5 kg (28.2 lbs)
Diameter 350 mm (13.8”)
Accessories (included) Speakon cable 5 m•
Carrying bag•
Order information NTi Audio # 600 000 500
4)
: 1 hour pink noise, Crest factor Cf = 9 dB
Directivity of DS2 acc. ISO140
Directivity of DS2 acc. ISO3382
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USER GUIDE
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Polar plot of DS2 @ 1 kHz and 2 kHz
Polar plot of DS2 @ 4 kHz and 8 kHz
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USER GUIDE
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