NTI Audio PA3 Power Amplifier

Name: NTI Audio PA3 Power Amplifier
Brand: Acoustic Analysis
SKU: NAPA3
Price: 5150 AUD
Availability: InStock

The portable NTI Audio PA3 Power Amplifier features a DSP-based signal generator with an integrated equaliser.

NTI Audio PA3 Power Amplifier

When used with the DS3 Dodecahedron Speaker, the NTI Audio PA3 generates pink noise with an acoustically flat frequency response. The equalisation ensures compliance with the ISO 16283-1 requirement of ≤ 8 dB difference between adjacent 1/3rd octave bands in the emitted sound. The amplifier also offers a test signal optimised for maximum sound power and includes an external audio input socket.

All controls are located on the sloping sides of the amplifier and are illuminated, making them easily recognisable and accessible from a standing position. For low-frequency measurements, an active subwoofer can be connected. The test signal can be toggled on and off from outside the measurement room using the supplied radio remote control.

The NTI Audio PA3 Power Amplifier is designed to be used with the DS3 Dodecahedron Speaker

Specifications

Maximum short-period output power: 2×260 W into 2×4 Ω (@ ≤ 1% THD)
Maximum continuous output power: 2×150 W into 2×4 Ω (with internal Pink noise @ maximum level)
Load impedance: ≥ 3 Ω (4-wire connection) or ≥ 8 Ω (2-wire connection / Bridge mode)
Protection: Dynamic compressor, temperature, overcurrent, DC, excessive clipping
Output connector: 4-pin Speakon (ch1: 1+|1– / ch2: 2+|2– or Bridge mode: 1+ / 2–)
THD: Typ. 0.017% @ 2×120 W into 2×4 Ω, 1 kHz
Level flatness: +0 / –3.3 dB @ 20 Hz to 20 kHz
Signal-to-noise ratio: ≥ 86 dB, bandwidth 22 kHz
Damping factor: ≥ 120 @ load ≥ 3 Ω and f < 2 kHz
Voltage gain: Muted | Level adjustable from –18 dB to 29.0 dB
Line IN:
- Input connector: XLR symmetric
- Input sensitivity: 0 dBu for specified output power into 23 Ω / 24 Ω (max. gain)
- Maximum input level: 20 dBu / ±11 Vp
- Input impedance: 10 kΩ symmetric
Subwoofer OUT:
- Output connector: XLR symmetric
- Voltage gain: 3 dB
- Maximum output level: 18 dBu / ±8.72 Vp
- Output impedance: ≤ 600 Ω symmetric
- Filter: 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: Internal noise generator, equalised Pink noise with Cf = 3.05 (9.69 dB)
- EQ Line: External signal, equalised
- Pink: Internal noise generator, non-equalised Pink noise with Cf = 3.4 (10.63 dB)
- Line: External signal, without equalisation
- User: Custom specific (available on request)
Default equalisation of Dodecahedron DS3:
- 1/3 Octave: Flat acoustic frequency response from 100 Hz to 8 kHz
- 1/1 Octave: 100 dB re 1 pW ±3 dB, 105 dB re 1 pW ±3 dB
Warning LEDs:
- Clip: Line IN input
- Protect: Amplifier automatically switches the output OFF at high temperature, overcurrent, etc.; with auto-retry function
Controls:
- Signal ON: ON/OFF switch with green/red LED
- Level: Knob for gain control
- Signal Source: Switch for selection of output signal
- Subwoofer ON: ON/OFF switch with green LED
Remote control:
- Function: Amplifier output ON/OFF
- Transmission power: 1 mW
Conformity:
- EU, China: EMC 2014/30/EU, EN 61326-1:2013, EN 61000-3/4-x, EN 55011+A1:2009
- R&TTE standard: 1999/5/EG; State Radio Regulation of China
- Japan: ARIB STD-T 67
- USA: FCC part 15
Weight: 5 kg
Dimensions: 358 x 173 x 245 mm