PA700 Measurement Power Amplifier

PA700 is the measurement power amplifier developed by BSWA for drive mid-power sound source, such as omni sound source, low frequency or mid-high frequency volume source and plane sound source, during building and acoustic field measurements.

PA700 based on class-D power amplifier technology, thus achieving a very small size and lightweight with a large output power, making it very suitable for field testing of building acoustic. The peak output power is up to 710 W with excellent THD+N and dynamic range. All connectors, controllers and displays are located on the front panel. The power amplifier can therefore be placed on the ground or in any other field for easy access.

PA700 has digital volume control, which can adjust the output amplitude according to dB level (it can display the maximum output power at this time). It also retains the continuous volume adjustment knob for fine tuning. PA700 also has a built-in white noise and pink noise generator (with high-pass and low-pass filters to select the output frequency range), and a Bluetooth audio receiver can play the stored audio files of mobile devices. Built-in noise signal and Bluetooth audio signal can be line out to other devices. PA700 is also supplied with wireless remote control, which can turn on / off the output of power amplifier even across building floor.


  ●  High performance measurement power amplifier based on class-D amplifier technology

  ●  Peak output power up to 710 W at 1% THD+N into 4 Ω

  ●  THD+N = 0.033% (1 W, 1 kHz, 4 Ω)

  ●  Frequency response 20 Hz~20 kHz

  ●  112 dB dynamic range (A-weighting, 1kHz, 4Ω)

  ●  Total power efficiency 74 %~84 %

  ●  Universal mains 100-240 VAC 50-60 Hz

  ●  Wireless remote control and Bluetooth audio receiver

  ●  Built-in white noise, pink noise generator (selectable output frequency range)

  ●  Overload, over-current, loop saturation, thermal and high-frequency protection

  ●  Lightweight and portable


  ●  Driving medium and high power sound source for building acoustic

  ●  Reverberation time measurement

  ●  Sound insulation measurement

  ●  Absorption coefficient measurement

  ●  Transfer path analysis


Architecture of Power Amplifier


Rated Output Power (Continuous, 25°C)

270 WRMS (4 Ω/8 Ω)

Peak Output Power1, 3

710 WRMS (4 Ω), 360 WRMS (8 Ω)

(1 kHz, THD+N≤1%. short duration: duty cycle 1/5, on time 300 s. supply by 230 VAC / 50 Hz)

Maximum Output Voltage3

75 VPeak (4 Ω/8 Ω)

Maximum Output Current

30 A

Minimum Load

2.5 Ω

Maximum Capacitive Loading

220 nF

Output Impedance2 (Typ.)

0.006 Ω (1 kHz), ≤0.4 (20 Hz~20 kHz)

Output Idle Noise3, 4 (Typ.)

22 Hz~20 kHz, Gain=0 dB:

169 uVRMS (4 Ω), 170 uVRMS (8 Ω)

A-weighting, Gain=0 dB:

120 uVRMS (4 Ω), 121 uVRMS (8 Ω)

Frequency Response3 (Typ.)

+0.2 dB~-0.7 dB (4 Ω), +0.2 dB~-0.8 dB (8 Ω) (20 Hz~20 kHz)

Dynamic Range3 (Typ.)

22 Hz~20 kHz, 1 kHz:

109.9 dB (4 Ω), 109.9 dB (8 Ω)

A-weighting, 1 kHz:

112.9 dB (4 Ω), 112.8 dB (8 Ω)

THD+N3 (Typ.)

1 kHz, 1 WRMS:

0.033 % (4 Ω), 0.032 % (8 Ω)

1 kHz, 100 % peak power:

1 % (4 Ω), ≤1 % (8 Ω)

Output Drive Mode


Output Connector

speakON socket and 4 mm banana socket

Maximum Input Voltage (Input Sensitivity)

1.0 VRMS

Input Impedance (Typ.)

≥39 kΩ (20 Hz~20 kHz)

Input Connector

XLR (balanced) and BNC (unbalanced)

Volume Control (Input Attenuator)

Analog: -~0 dB (continuous). Digital: 0 dB~-25 dB (1 dB/step), -27 dB, -30 dB, -39 dB and -Inf, total 30 steps

Built-in Noise Generator

White Noise (20 Hz~20 kHz: ±1 dB, CF=2.5), pink Noise (20 Hz~20 kHz / ±1.5 dB, CF=4.6), period Time: 120 s. High-pass filters: 20 Hz, 40 Hz, 80Hz, 160 Hz, 316 Hz; low-pass filters: 8 kHz, 10 kHz, 12.5 kHz, 16 kHz, 20kHz

Bluetooth Audio

Bluetooth v4.0, 2.4 GHz, AACMP3SBCAPTX decoder

Switching Frequency Range (Amplifier)

90 kHz~560 kHz

Total Power Efficiency

74 %~84 % (100 WRMS~700 WRMS)

Limiter and Overload Indicator

Built-in voltage limiter with clip indicator on when maximum output amplitude was reached.

Remote Control 5

LoRa® spread spectrum 433 MHz wireless remote control, transmitting range 100 m (≤10 mW) and cross two layer floors at least. (915 MHz wireless remote control is optional, must consult before ordering.)


Overload, over-current, loop saturation, thermal and high-frequency protection


Fan forced cooling (Automatic fan control based on output power)

Power Supply

100-240 VAC 50-60 Hz, 900 W Max, IEC Type C13 connector


T6AL 250V (5 mm x 20 mm)

Firmware Update

Update firmware via USB port

Operation Environment

-10 °C~50 °C, 0 %RH~95 %RH

Dimensions (mm)

W284 x H90 x D248

Shipping Case Dimension (mm)

W428 x H153 x D350


3.0 kg (power amplifier only)

Note 1: Contact manufacturer for the peak output power operating time of other supply voltage.

Note 2: Measured directly at the terminals on the PCB.

Note 3: Measured by AUX-0025 filter and dScope Series III analyzer with AES17 20 kHz filter.

Note 4: Measured by connected a 600 Ω external terminal at input.

Note 5: The remote control transmitting range and floor across tests were carried out using 433 MHz remote control in commercial / residential buildings of ordinary specifications.

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