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Dorrough 40-C - Horizontal Rackmount Analog Loudness Meter with "C" Scale Option

B&H # DO40C Mfr # 40-C
Usually ships in 7-14 business days

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This is a Special order item. Est. arrival at B&H is 7-14 business days (subject to availability). Your order will be charged at time of shipment. Item is non-cancelable and non-returnable.
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You Pay: $429.99

The Dorrough 40-C 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, allowing for 20dB of headroom in 1dB steps of resolution per LED.

Rack or console mounted Analog Loudness Meter with dual dedicated ballistics for simultaneous peak and average readout
Microchip processor with accuracy of oscilloscope, ultra-fast response time of 600ms average, virtually instantaneous peak for seamless continuous display of peak/average relationship
Individual left and right XLR inputs for stereo mixing applications, +4 dB factory-calibrated
Display with 40 LED's providing 1dB resolution per LED
Proprietary "C" scale with 20dB of headroom in 1dB steps, identical to AES/EBU digital standard
XLR, 6 DIP switches for function assignments, mini 8-pin DIN port out for access to alarm relays, meter mode functions, and peak hold modes, standard with unit
Input Impedance 20 kOhm balanced
10 kOhm 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 >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%
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) 8.5 x 6.5 x 2.8" (215.9 x 165.1 x 71.1mm)
Weight 2.3 lb (1.04 kg)
Dorrough 40-C - Horizontal Rackmount Analog Loudness Meter with "C" Scale Option
  • Owner's Manual
  • 1 Year Warranty
  • REVIEW SNAPSHOT®

    by PowerReviews
    Dorrough40-C - Analog Loudness Meter w/C Scale
     
    5.0

    (based on 1 review)

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    Reviewed by 1 customer

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    (2 of 2 customers found this review helpful)

     
    5.0

    Monitors the mic chain to the DAW

    By Thom

    from Columbis, GA

    Verified Buyer

    Pros

    • Fast and accurate
    • Portable
    • Stable

    Cons

    • No "through" connector

    Best Uses

    • Calibrate analog -20 dbfs
    • Micline monitoring
    • Professional Recording

    Comments about Dorrough 40-C - Analog Loudness Meter w/C Scale:

    Clean, accurate, functional, I don't know how I got by without it!
    I have placed the Dorroughs 40C in my patch bay. This allows me to calibrate my analog equipment to -20 dbfs. and monitor my mic or line signal into the digital domain. The 40 C is fast and displays peak, average and compression simultaneously. The normal patch monitors my mixer main channel out to the DAW input, but I can patch it in to any point in the signal chain for calibrating levels or for real time monitoring. Since this meter doesn't have a "thru" signal, needed a unity gain distribution amp in order to patch it in properly.

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