$ 1,650 .00
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Dorrough Model 1200

Stereo signal test set
MFR# Model 1200

Product Description

The Dorrough Stereo Signal Test Set Model 1200 is a 2u 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.

Product Specifications

Condition New

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I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
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In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
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This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
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