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Audio Meters

Coleman Audio SMP5.1 Surround VU Meter System
Surround VU Meter System

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Coleman Audio SR7.1
Surround Level Control

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Years of hands-on experience and frustration with both VU and PPM metering led to the development of the DORROUGH Loudness Monitors. DORROUGH’s research has established the relationship between integration time, RMS metering and the display of peak levels. The DORROUGH Loudness Monitor displays, in an easy-to-read format, the actual energy content of the program material, regardless of frequency, while still indicating the peak amplitude of the complex audio signal. It allows the operator to ride levels in a manner such that all program material can be adjusted for equal perceived loudness while protecting the peak of the waveform. Now, one meter gives you more complete and more usable information than any combination of peak hold, VU and PPM indicators. The DORROUGH Loudness Monitor integrates on the same scale, two ballistics, showing the relationship between the average and the peak. It simultaneously displays peak and average, and the relative difference, in dB, between these two ballistics is derived from the integration time of the persistence scale. The operator has only to adjust the level until either the peak or persistence reference is reached. This will result in the maximum level, regardless of program content. Material with or without compression can easily be matched for the same listening level. Each DORROUGH Loudness Monitor features Right and Left inputs for use in stereo mixing applications. With one instrument, the operator can easily see the stereo mix and avoid the classic in-phase/out-of-phase problem. “Center channel build-up,” the addition of in-phase or monophonic material which causes the mix to be perceived as louder, will appear as a sudden increase in level. This is especially important in preparing stereo program material for broadcast, while still being able to maintain monaural compatibility. 40 Series The 40-A series Loudness Meters are considered the standard models with built-in power supplies. They are the large ARC-Style, three color LED display single channel meters. The 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. 40-A The 40-A has a scale showing 14 dB headroom in 1dB steps from +14 to -25.

Dorrough 40-A Meter (Racked Pair)
Analog Audio Meters (Racked Pair)

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Dorrough 40-A Meter (Single)
Analog Audio Meter

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Years of hands-on experience and frustration with both VU and PPM metering led to the development of the DORROUGH Loudness Monitors. DORROUGH’s research has established the relationship between integration time, RMS metering and the display of peak levels. The DORROUGH Loudness Monitor displays, in an easy-to-read format, the actual energy content of the program material, regardless of frequency, while still indicating the peak amplitude of the complex audio signal. It allows the operator to ride levels in a manner such that all program material can be adjusted for equal perceived loudness while protecting the peak of the waveform. Now, one meter gives you more complete and more usable information than any combination of peak hold, VU and PPM indicators. The DORROUGH Loudness Monitor integrates on the same scale, two ballistics, showing the relationship between the average and the peak. It simultaneously displays peak and average, and the relative difference, in dB, between these two ballistics is derived from the integration time of the persistence scale. The operator has only to adjust the level until either the peak or persistence reference is reached. This will result in the maximum level, regardless of program content. Material with or without compression can easily be matched for the same listening level. Each DORROUGH Loudness Monitor features Right and Left inputs for use in stereo mixing applications. With one instrument, the operator can easily see the stereo mix and avoid the classic in-phase/out-of-phase problem. “Center channel build-up,” the addition of in-phase or monophonic material which causes the mix to be perceived as louder, will appear as a sudden increase in level. This is especially important in preparing stereo program material for broadcast, while still being able to maintain monaural compatibility. 40 Series The 40-A series Loudness Meters are considered the standard models with built-in power supplies. They are the large ARC-Style, three color LED display single channel meters. The 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. 40-B The 40-B is a scale variation of the 40-A and is calibrated in percent modulation, referenced at 100%. It has a lower scale in dB from -36 to +3dB. For accurate peak protection at transmission sites.

Dorrough 40-B Meter (Racked Pair)
Analog Audio Meters

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Years of hands-on experience and frustration with both VU and PPM metering led to the development of the DORROUGH Loudness Monitors. DORROUGH’s research has established the relationship between integration time, RMS metering and the display of peak levels. The DORROUGH Loudness Monitor displays, in an easy-to-read format, the actual energy content of the program material, regardless of frequency, while still indicating the peak amplitude of the complex audio signal. It allows the operator to ride levels in a manner such that all program material can be adjusted for equal perceived loudness while protecting the peak of the waveform. Now, one meter gives you more complete and more usable information than any combination of peak hold, VU and PPM indicators. The DORROUGH Loudness Monitor integrates on the same scale, two ballistics, showing the relationship between the average and the peak. It simultaneously displays peak and average, and the relative difference, in dB, between these two ballistics is derived from the integration time of the persistence scale. The operator has only to adjust the level until either the peak or persistence reference is reached. This will result in the maximum level, regardless of program content. Material with or without compression can easily be matched for the same listening level. Each DORROUGH Loudness Monitor features Right and Left inputs for use in stereo mixing applications. With one instrument, the operator can easily see the stereo mix and avoid the classic in-phase/out-of-phase problem. “Center channel build-up,” the addition of in-phase or monophonic material which causes the mix to be perceived as louder, will appear as a sudden increase in level. This is especially important in preparing stereo program material for broadcast, while still being able to maintain monaural compatibility. 40 Series The 40-A series Loudness Meters are considered the standard models with built-in power supplies. They are the large ARC-Style, three color LED display single channel meters. The 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. 40-B The 40-B is a scale variation of the 40-A and is calibrated in percent modulation, referenced at 100%. It has a lower scale in dB from -36 to +3dB. For accurate peak protection at transmission sites.

Dorrough 40-B Meter (Single)
Analog Audio Meter

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Years of hands-on experience and frustration with both VU and PPM metering led to the development of the DORROUGH Loudness Monitors. DORROUGH’s research has established the relationship between integration time, RMS metering and the display of peak levels. The DORROUGH Loudness Monitor displays, in an easy-to-read format, the actual energy content of the program material, regardless of frequency, while still indicating the peak amplitude of the complex audio signal. It allows the operator to ride levels in a manner such that all program material can be adjusted for equal perceived loudness while protecting the peak of the waveform. Now, one meter gives you more complete and more usable information than any combination of peak hold, VU and PPM indicators. The DORROUGH Loudness Monitor integrates on the same scale, two ballistics, showing the relationship between the average and the peak. It simultaneously displays peak and average, and the relative difference, in dB, between these two ballistics is derived from the integration time of the persistence scale. The operator has only to adjust the level until either the peak or persistence reference is reached. This will result in the maximum level, regardless of program content. Material with or without compression can easily be matched for the same listening level. Each DORROUGH Loudness Monitor features Right and Left inputs for use in stereo mixing applications. With one instrument, the operator can easily see the stereo mix and avoid the classic in-phase/out-of-phase problem. “Center channel build-up,” the addition of in-phase or monophonic material which causes the mix to be perceived as louder, will appear as a sudden increase in level. This is especially important in preparing stereo program material for broadcast, while still being able to maintain monaural compatibility. 40 Series The 40-A series Loudness Meters are considered the standard models with built-in power supplies. They are the large ARC-Style, three color LED display single channel meters. The 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. 40-C The 40-C has a scale allowing for 20dB of headroom in 1dB steps. The headroom scale is identical to the AES/EBU Digital Standard.

Dorrough 40-C Meter (Racked Pair)
Analog Audio Meters

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Years of hands-on experience and frustration with both VU and PPM metering led to the development of the DORROUGH Loudness Monitors. DORROUGH’s research has established the relationship between integration time, RMS metering and the display of peak levels. The DORROUGH Loudness Monitor displays, in an easy-to-read format, the actual energy content of the program material, regardless of frequency, while still indicating the peak amplitude of the complex audio signal. It allows the operator to ride levels in a manner such that all program material can be adjusted for equal perceived loudness while protecting the peak of the waveform. Now, one meter gives you more complete and more usable information than any combination of peak hold, VU and PPM indicators. The DORROUGH Loudness Monitor integrates on the same scale, two ballistics, showing the relationship between the average and the peak. It simultaneously displays peak and average, and the relative difference, in dB, between these two ballistics is derived from the integration time of the persistence scale. The operator has only to adjust the level until either the peak or persistence reference is reached. This will result in the maximum level, regardless of program content. Material with or without compression can easily be matched for the same listening level. Each DORROUGH Loudness Monitor features Right and Left inputs for use in stereo mixing applications. With one instrument, the operator can easily see the stereo mix and avoid the classic in-phase/out-of-phase problem. “Center channel build-up,” the addition of in-phase or monophonic material which causes the mix to be perceived as louder, will appear as a sudden increase in level. This is especially important in preparing stereo program material for broadcast, while still being able to maintain monaural compatibility. 40 Series The 40-A series Loudness Meters are considered the standard models with built-in power supplies. They are the large ARC-Style, three color LED display single channel meters. The 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. 40-C The 40-C has a scale allowing for 20dB of headroom in 1dB steps. The headroom scale is identical to the AES/EBU Digital Standard.

Dorrough 40-C Meter (Single)
Analog Audio Meter

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The Dorrough Stereo Signal Test Set Model 1200 is a 2 RU rack-mount instrument, allowing instant dynamic monitoring of audio levels, balance, crosstalk, system gain, signal-to-noise ratios and program "center-channel build-up". Verifying proper polarity and balance of stereo broadcast lines is a primary application. Two Loudness Meters are provided.
 
"Function", "Range", and "Attenuation" controls are set in tandem with the meters to achieve all measurements. Left and right channels are input via loop-thru XLR connectors or a parallel barrier strip. The back-panel also sports a line-level 1/4" stereo output for connection to a scope. A front mounted amplified, stereo headphone jack is also provided for monitoring.
 
A typical application instantly reveals Left/Right polarity and Phase Compatibility. First, measure the system gain and adjust the channels for equal Left/Right readings. Next, a mono signal is fed into both channels. With the function switch set to "Sum/Diff" adjust the "Range Attenuator" and/or "High/Low" control until a Left meter reading of -6 dB is achieved. The "Function" control is then set to "Stereo" and then back to "Sum/Diff". Then simply note the difference of Left/Sum and Right/Diff meters. Same polarity produces a 6 dB increase on the Left/Sum meter and no reading on the Right/Diff meter. If the readings are reversed, one of the channels has reversed polarity: The Model 1200 helps provides the ultimate in program consistency and quality assurance.

Dorrough Model 1200
Stereo Signal Test Set

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The DDD603 stand-alone mastering meter includes the 1630 standard ballistics and overload indication, plus many additional features such as peak counter, phase meter, VU metering and more. Its extensive features made it a home with many top mastering studios including Bob Ludwig’s Gateway Mastering. The meter is software based and it’s upgradeable via firmware ROM. The meter dimensions are 1.43 x 5.25 (3U) x 5.5" (12 units fit into 19" rack). The unit is powered through an external international (100-240 VAC) power adaptor (included). DDD-603 is portable, can be placed on top of a console meter bridge, mounted in a console faceplate, or in a 19" rack (w/ optional hardware). Digital input and digital throughput are provided on two rear mounted XLR connectors. The meter accepts regular 44.1/48k and single hi-speed 96k AES/EBU or SPDIF inputs. RCA to XLR adaptor described in the manual is required for SPDIF signals. DDD603 works with any sample frequency between 25-100kHz and it’s manufactured in two physical configurations: horizontal and vertical.

Mytek Digital DDD-603 - Horizontal
Digital 96kHz AES/EBU/SPDIF Meter- Horizontal

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Mytek Digital DDD-603 - Vertical
Digital 96kHz AES/EBU/SPDIF Meter- - Vertical

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Mytek Digital DDD-603 Surround Meter Pack
6 Channel Surround Meter Pack

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For decades, TC Electronic has explored and pioneered the field of 
digital audio and loudness metering, offering state of the art tools 
that let you measure, correct and convert audio for a wide variety of 
applications. With TC Electronic LM2,
 you get a full-featured stereo loudness and true-peak level meter which
 is perfect not only for post, film and live production, but also for 
broadcast ingest, linking and transmission. When you need to 
comply with broadcast standards, the numbers are paramount, and on LM2’s
 front panel, you can check the all-important digits instantly. For even
 more loudness details, simply connect LM2 to a PC or Mac via USB and 
you get full, real-timer Radar screen picture using the included Icon 
application. 
 
Precision Normalization and Meta Data 
Global broadcast guidelines now recognize the need for keeping audio 
transmission easy and predictable; the main facilitators being 
transparent normalization and fixed metadata. LM2 facilitates precision 
normalization and optimum use of dialnorm metadata in AC3 transmission 
in order to avoid level jumps between regular programming and promos or 
commercials. 
 
Standard Support 
LM2 comes pre-loaded with factory presets compliant with new ITU-R 
BS.1770, ATSC A/85, EBU R128, NABJ, OP-59, BCAP and more guidelines. LM2
 is easily field upgradeable* and will keep synchronized with global 
practices as they refine. Undoubtedly, standards will be updated within 
LM2's warranty period which is a whopping 5 years. 
 
Connections 
LM2 always offers a wide variety of 24 bit resolution audio inputs and 
outputs: AES/EBU, TOS, SPDIF / AES3 id, ADAT and Analog. Analog I/Os are
 scaled in the analog domain for max utilization of converter dynamic 
range. Analog inputs may be trimmed at 0.01 dB precision. LM2 may 
connect via USB to a PC or a Mac for access to the Radar display, 
Logging, Remote control, Preset management etc. 
 
24/7 Logging 
As a standard feature, LM2 comes with hindsight: The radar can show the 
past 24 hours, but LM2 actually includes so much memory of its own that 
you can take a detailed look one week back in time, even if it has had 
no connection to a computer. Dump log files routinely to a PC or to a 
Mac, import files into graphing templates included, or design your own 
in Excel, Numbers etc. 
 
Ingest Normalization 
The primary application for LM2 is as a loudness meter but it does one 
more thing very well: Automatic level offset of programs at a 
no-compromise resolution (48 bit, fixed point). LM2 therefore includes a
 precision true-peak limiter to avoid output overload when positive gain
 normalization is required. For fans of speech normalization, allow LM2 
to measure some regular dialog and normalize to that. Otherwise, let its
 relative gate function automatically take care of all sources. Presets 
are included, the choice is yours. 
 
* PCMCIA SRAM card required (optional)

TC Electronic LM2
Precision Loudness and True-Peak Meter

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Tascam MU-1000 Meterbridge
Meterbridge for the DM-3200 & DM-4800

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