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Dorrough 400-C Jumbo Analog Loudness Meter +20dB

B&H # DO400C MFR # 400-C
Dorrough Jumbo Analog Loudness Meter +20dB

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The Dorrough 400-C Analog Loudness Meter +20dB is a jumbo version of the Dorrough 40 series professional analog loudness meter, visible from distances of over 50 feet and designed for modern theater or concert audio requirements. The 400-C has simultaneous average and peak program display in a large arc-style meter with separate ballistics and lightning-fast response. It is equipped with a 40-LED bar graph, showing 1dB of resolution per LED, and 20dB of headroom identical to the AES/EBU Digital Standard.

A remote control is now available for these units and will access the functions of phase correlation display, peak hold, sum/diff, and activate a reference mode allowing for accurate 0 setting within .1dB. A red LED notification alarm is present on the front of the unit.

Actual Energy Display
Dorrough Loudness Meters display actual energy content of the program material, regardless of frequency, while still indicating the peak amplitude of the complex audio signal. This feature allows all program material to be adjusted for equal perceived loudness while protecting the peak of the waveform.
Extra Large Display
Designed for theater or concert applications, this meter can be seen from up to 50' away. The display is in large arc-style with three-color LED single channel meters.
Peak and Average Level Metering
The 400-C, like all Dorrough loudness meters, simultaneously displays peak and average, in this model up to +20dB. The relative difference, in dB, between these two ballistics is derived from the integration time of the persistence scale.
Right and Left Inputs for Stereo Mixing
With one instrument, the operator can easily see the stereo mix and avoid classic in-phase/out-of-phase problems as well as center channel buildup that can cause a mix to seem louder. This is especially important in preparing stereo program material for broadcast, while still being able to maintain monaural compatibility.
Input Impedance 20k Ohm balanced, 10k Ohm single-ended, +/- 2%
Common Mode Rejection Ratio 80 dB at 60 Hz, 60 dB at 20 kHz (balanced mode)
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 Less than 1% THD at 1 kHz, +24 dB input
Sum Error Less than 0.1 dB at 1 kHz
Difference Error Less than 0.1 dB at 1 kHz
Display Resolution Less than 0.1 dB at 1 kHz
Step Size Error +/- 0.25 dB
Absolute Error Full Scale -39 dBu: +/- 0.25 dB model A,B,C
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 (models A, B, C)
Display Update Rate Approximately 10 mS
Display Duty Cycle Display Time, AVERAGE, PEAK HOLD - 75%

Display Time, PEAK - 100%
Power Supply Input Range 117/237 VAC RMS, -20% to +10%, 50-60 Hz
Calibration Controls None Needed
User Controls Left/Right input sensitivity Option DIP Switch

A) Peak Auto [ON]

B) Difference Mode [ON/OFF]

C) Over Level Alarm [ENABLE]

D) Under Level Alarm [ENABLE]

E) Auto ARMP
User Port DB-9 Connector A) Alarm relay closure contacts 1 form C, 1A, 30V AC or DC

 B) Mode control switch (user supplied)

C) PEAK function switch (user supplied)
Dimensions (WxDxH) 23 x 8 x 4.25" (in.) (9.1 x 3.1 x 1.7cm)
Weight Not Specified by Manufacturer
Dorrough 400-C Jumbo Analog Loudness Meter +20dB
  • 2-Year Warranty
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