TOA DPL2 Ambient Noise/Ambient Level Controller to keep BGM and announcements audible and understandable


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SKU: DPL2 Category: Tag:


TOA DPL2 Digital Ambient noise controller adjusts BGM/announcement sound volume to match changes in listening area noise levels.

The TOA DPL2 Digital Ambient Noise Controller is the easy, automatic solution to the problem of keeping BGM and announcements audible and understandable when the ambient noise levels at an airport check-in counter or boarding gate, or a shopping mall, restaurant or pub, are higher because a large number of people are present. Furthermore, the DPL2 also works to keep music and information audio from reaching levels that are irritating to customers and staff when the surrounding ambient noise levels are not so high.


  • Digital ambient noise control (ANC) function with 4-LED metering automatically makes adjustments to output gain to match changes in ambient noise levels
  • Distinguishes unit output sound level from ambient noise levels for more accurate automatic noise control
  • Maximum output function acts as a limiter
  • Microphone input reference level adjustment function with phantom power switch
  • Eight-LED input and output level metering on front panel
  • A built-in key lock function protects against accidental change of settings


Power Source 220 – 240 V AC
Power Consumption 20 W (220 mA)
Frequency Response 20 Hz – 20 kHz
Sampling Frequency 48 kHz
Dynamic Range 108 dB (IHF-A weighted) or more
Distortion 0.006 % or less
Input Sensor input (Ambient noise sensor microphone input)
: +4/-48 dB* changeable
removable terminal block (4 pins)
phantom power (+15 V DC
with +15 V DC terminal
Input 1
removable terminal block (3 pins)
Output Monitor output: +4 dB*
Output 1
A/D Converter 24 bit
D/A Converter 24 bit


Signal Processing
Automatic Level Control Function Level meter (4 LED meters)
Automatic input sensitivity setting function: +4/-8/-20 dB*
Noise gate level setting: -99 to -3 dB
Ambient Noise Control Function Level meter (4 LED meters)
Automatic sensor input reference level measuring function
Sensor input reference level fine adjustment function
Maximum output signal level control: -15 to 0 dB
Minimum output signal level control: -18 to -3 dB
Sample time setting: 10 s
Gain ratio setting: (Ambient noise: Output signal level) 6:3
Ambient noise measuring frequency setting: 20 Hz – 20 kHz
Maximum Output Signal Level Control Function -12
Input Level Indicator 8 LEDs indicator
Output Level Indicator 8 LEDs indicator
Other Feature Phantom power switch (sensor input)
Ground lift switch (INPUT 1
Operating Temperature 0 ℃ to +40 ℃ (32 ゜F to 104 ゜F)
Operating Humidity 90 %RH or less (no condensation)
Finish Pre-coated steel plate
Dimensions 482 (W) × 44 (H) × 303 (D) mm (18.98 × 1.73″ × 11.93)
Weight 3.7 kg (8.16 lb)
Accessory Removable terminal plug (4 pins)…1
Power cord (2 m (6.56 ft)) …1