Dorrough 40-A - Analog Loudness Meter

Dorrough 40-A - Horizontal Rackmount Analog Loudness Meter

Dorrough 40-A - Horizontal Rackmount Analog Loudness Meter

B&H # DO40A MFR # 40-A
Dorrough 40-A - Analog Loudness Meter

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  • 1Description

The Dorrough 40-A 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.

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 "A" scale with 14dB of headroom
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
In the Box
Dorrough 40-A - Horizontal Rackmount Analog Loudness Meter
  • Owner's Manual
  • 1 Year Warranty
  • Table of Contents
    • 1Description
    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)
    Packaging Info
    Package Weight 2.5 lb
    Box Dimensions (LxWxH) 10.787 x 7.402 x 3.858"
    40-A - Analog Loudness Meter is rated 5.0 out of 5 by 2.
    Rated 5 out of 5 by from BUY IT!! this is a great VU meter. I love the way it works and displays. Simply an elegant meter in design and function. I own a bunch of meters and a couple Dorrough and these are the best. My only complaint is the chassis is a plastic and feels cheap but it is durable, and I will get picky, i would prefer Combi (XLR/TRS) connectors.
    Date published: 2014-11-03
    Rated 5 out of 5 by from You should get one. More than any other piece of equipment, this meter will improve your recording and mix quality. It's 500 bucks. That's enough for some 500 series modules. It's enough for a lower mid level mic. I'm sure you could find all kinds of exciting ways to blow 500 bucks. But this is the purchase that will provide the best return on investment. With this, you can make the preamps on a $100 Behringer mixer sound clean. You can maximize the available headroom on your DA converters feeding your summing amp and stop throwing away perfectly good bits and voltage. You can make the loudness wars irrelevant. You can stop being annoyed by the fact that even your really expensive gear has near-useless VU meters, and finally dial in the saturation you always wanted for tracks so smooth you would think they were run through the perfect compressor. You can use it as a lab scope and calibrate your console with a high level of accuracy. You can stop trusting the spec sheets on your gear and measure max operating levels yourself. This lets you squeeze the absolute highest performance out of any piece of equipment, whether it cost you $100 or $5000. And you will notice the difference immediately, provided you know how to use it correctly. The only real question is: do you go with 14dB or 20dB of headroom? I went with this guy because the 20dB is special order and I'm impatient. I was worried 14dB would be a little too small of a dynamic range but in practice for my music it works just fine. If you're classical or jazz or a critical stickler, special order the 40C and wait for it.
    Date published: 2016-07-21
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