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)
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PA3 rear panel
1+
1–
2–
2+
1+
2–
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USER GUIDE
Specifications PA3
Maximum short-period output power 2*350 W into 2*3 W | 2*260 W into 2*4 W (@ 1 % THD)
Maximum continuous output power
Load impedance ≥ 3 W (4-wire connection) or ≥ 8 W (2-wire connection / Bridge mode)
Protection Dynamic compressor, temperature, overcurrent, DC, excessive clipping
Output connector 4-pin Speakon (chn1: 1+|1– / chn2: 2+|2– or Bridge mode: 1+ / 2–)
THD typ. 0.017 % @ 2*120 W into 2*4 W, 1 kHz
Level flatness +0 / –3.3 dB2) @ 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
Subwoofer OUT
Output connector
Voltage gain
Maximum output level
Output impedance
Filter
Signals (selectable)
3)
EQ Pink
EQ Line
Pink
Line
User
Default equalization of Dodecahedron DS3
1/3 Octave
1/1 Octave
Warning LEDs
Clip
Protect
Controls
Signal ON
Level
Signal Source
Subwoofer ON
Remote control Amplifier output ON/OFF
Conformity EU: EMC 2014/30/EU, EN 61326-1:2013, EN 61000-3/4-x, EN 55011+A1:2009•
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 100 to 240 VAC, 50/60 Hz, 550 W typical power consumption
Fuse T6.3 A (5 x 20 mm)
Temperature, humidity 0° to +50°C (32° to 122°F) @ ≤ 90% RH (non-condensing), active cooling with fan
Accessories (included) Remote control•
Order information NTi Audio # 600 000 506 (433 MHz) / 600 000 510 (315 MHz,USA) / 600 000 511 (426 MHz, JP)
1)
2*160 W into 2*3 W | 2*120 W into 2*4 W (with internal Pink noise @ maximum level)
XLR symmetric
0 dBu for specified output power into 2*3 W / 2*4 W (max. gain)
20 dBu / ±11 Vp
10 kW symmetric
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
Internal noise generator, equalized Pink noise (Cf = 3.05)
External signal, equalized
Internal noise generator, Pink noise without equalization (Cf = 3.4)
External signal, without equalization
Custom specific (
available on request
)
Flat acoustic frequency response from 100 Hz to 8 kHz
100 dB re 1 pW ±3 dB
105 dB re 1 pW ±3 dB
Line IN input
Amplifier automatically switches the output OFF at high temperature, overcurrent
etc.; with auto-retry function
ON/OFF switch with green/red LED
Knob for gain control
Switch for selection of output signal
ON/OFF switch with green LED
China: R&TTE standard 1999/5/EG; State Radio Regulation of China•
Japan: ARIB STD-T 67•
USA: 315 MHz sender: according to FCC part 15•
Carrying bag•
1)
: Without filtering
2)
: Without equalization, with 20 kHz Butterworth high pass (24 dB damping factor)
3)
: The ISO16283-1:2014 standard requires a minimum energy-averaged sound pressure difference between contiguous 1/3rd octave bands. This difference
shall not be more than 8 dB in the source room. The PA3 ‘EQ Pink’ signal source is designed to deliver these minimum sound pressure level differences
from the DS3. This is most suitable for room insulation measurements taken in accordance with the standard.
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Page 3 / 6
USER GUIDE
Specifications DS3
Standards ISO16283, ISO140, ISO3382, ISO354, DIN52210, ASTM-E2235/-E336/-E90
Nominal impedance 2*4.2 W
Maximum input power RMS 320 W @ 1 hour Pink noise (Crest factor Cf = 9 dB)
Maximum peak power 600 W
Sound power level > 120.0 dB re 1 pW (typical 120.5 dB re 1 pW)
Power compression < 1 dB (after 1 h continuous operation @ maximum power)
Equalized sound pressure level
1/3 Octave
1/1 Octave
Bandwidth 50 Hz to 10 kHz
Input connector Speakon (chn1: 1+|1– / chn2: 2+|2–)
Number of speakers 12 pcs. à 5”, in dodecahedral configuration
Weight 7.5 kg (16.53 lbs)
Diameter 350 mm (13.8”)
Accessories (included) Included: Carrying bag and Speakon cable 5 m•
Order information NTi Audio # 600 000 507
PA3 amplifier output adjusted for acoustically equalized DS3 output signal
100 dB re 1 pW ±3 dB from 100 Hz to 8 kHz
105 dB re 1 pW ±3 dB from 125 Hz to 8 kHz
Optional: Speaker stand 35 mm, 130...230 cm retractable, with carrying bag •
(NTi# 600 000 508)
Optional: Speakon cable 10 m (NTi # 600 000 512) or 20 m (NTi # 600 000 513)•
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DS3 frequency response @ PA3 setting ‘Pink’ (maximum sound power)
DS3 frequency response @ PA3 setting ‘EQ Pink’ (equalized)
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USER GUIDE
Polar plot of DS3 @ 1 kHz and 2 kHz for horizontal plane, measured in 1.5 m distance with 3rd octave analysis
(signal source: GlideSweep)
Polar plot of DS3 @ 4 kHz and 5 kHz for horizontal plane, measured in 1.5 m distance with 3rd octave analysis
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(signal source: GlideSweep)
Page 5 / 6
DS3 power compression @ 300 W continuous power (PA3 setting ‘Pink’)
USER GUIDE
Directivity of DS3 in accordance with ISO 16283-1:2014
Directivity of DS3 in accordance with ISO 3382-1:2009
x:
max. positive deviation from mean for moving 30° arc. average
x:
max. negative deviation from mean for moving 30° arc. average
All information subject to change without notice.
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Page 6 / 6
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