Dorrough electronics 40-A2 Loudness monitor








- Stock: Out Of Stock
- Code: BS18207
- Model: 40-A2
Dorrough electronics 40-A2 Loudness monitor
The Dorrough 40-A2 is a professional analog loudness meter, designed for modern stereo recording and broadcast requirements, and offering simultaneous average and peak program display, with separate ballistics and lightning-fast response. This meter is equipped with a 40-LED bar graph, showing 1dB of resolution per LED, and 14dB of headroom.
Technical Details
Dorrough electronics 40-A2 Specs
Input Impedance | 20 kOhm balanced |
Common Mode Rejection Ratio | 80 dB at 60 Hz |
Input Sensitivity | -10 dB for full-scale display |
Maximum Input Level | +24 dB before clipping |
Signal Path Bandwidth | 10 Hz - 25 kHz, +/- .25 dB |
Signal Path Distortion | >1% THD at 1 kHz, +24 dB input |
Sum Error | >0.1 dB at 1 kHz |
Difference Error | >0.1 dB at 1 kHz |
Display Resolution | 40 LEDs, 1 dB/LED |
Step Size Error | +/- 0.25 dB |
Absolute Error | +/- 0.25 dB (Full Scale -39 dBu) |
Drift | +/- 0.25 dB |
Average Time Constant | 600 mS, +/- 6% |
Peak Acquisition Period | 10 uS, to full-scale, sine input 25kHz |
Peak Attack Period | Virtually Instantaneous |
Peak Decay Period | 180 mS, from full-scale to all LEDs off |
Display Update Rate | Approximately 10 mS |
Display Duty Cycle | Display Time, AVERAGE, PEAK HOLD - 75% |
Power Supply Input Range | 117/237 VAC RMS, -20% to +10%, 50-60 Hz |
Calibration Controls | None needed |
User Controls | Left/Right input sensitivity |
User Port | DB-9 Connector: |
Dimensions (WxDxH) | 8.5 x 6.5 x 2.8" (215.9 x 165.1 x 71.1mm) |
Weight | 2.3 lb (1.04 kg) |