Crown Audio VT-15 manual Benc h Test, Initial Set-Up

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should result in “0 VU” on a properly aligned recorder. (This reference level can be changed; see the Maintenance Section.) This is a true VU meter, and conforms to ASA Standard C16.5-1954.

In the GR position, the VU meter monitors the amount of gain reduction (compression). As the VT-15 warms up, the normal “0VU” position of the meter needle (with no compression) may drift slightly. This has no effect on the sound of the VT-15 nor the accuracy of the gain reduction measurement.

Power switch and indicator Primary power is applied to the VT-15 circuits when the Power switch is in the up position. The amber pilot lamp and VU meter back-lighting indicate that the unit is on. It takes about twenty seconds for the VT-15 to start working, but it is suggest- ed that you turn on the power at least five minutes prior to use. The tubes are often noisy until all the internal elements reach a stable operating temperature.

Benc h Test

If desired, test the VT-15 before installation. The source generator should be set to -50 dBm, 150 ohms impedance, balanced, and the output should feed a balanced bridging input of the audio analyzer. Measured bandwidth should be 22 cps to 22 kc to obtain the same readings as the factory test results. Compare your measurements with the test data supplied with VT- 15. Keep the results for comparison in future maintenance tests.

Initial Set-Up

The VT-15 should be installed as detailed in the Installation section. With the outputs con- nected to an appropriate destination (typically to audio recorder inputs), configure the stu- dio to monitor the VT-15 output. Apply power and wait about twenty seconds for the tube fil- aments to get up to temperature. Check for hum, buzz, or other noise. For the first few min- utes after a cold start it is not unusual for the VT-15 to produce hiss, pops, and microphonic “clanks” as the internal elements of the tubes expand from the heat. Correct any ground loop problems before proceeding.

SUGGESTIONS:

You have chosen to use the VT-15 because of the superior sound it provides. To gain the max- imum benefit from your investment, it is important that you hook up the VT-15 so that other factors do not adversely affect the sound quality.

VT-15 Recording Channel

D.W. FEARN

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Contents Fearn How to Contact us Certificate of RoHS Compliance FearnPage VT-15 Vacuum Tube Recording Channel Final Test Report List of Illustrations B l e o f C o n t e n t sCopyright 2007 D.W. Fearn & Associates Limited 5-Year Warranty History of the VT-15 Vacuum Tube Recording Channel Fearn E C I F I C AT I O N S E C I F I C AT I O N S C O N T ’ D S C R I P T I O N Fearn S TA L L AT I O N PowerGrounding and Shields Input and Output ConnectionsE R AT I O N VT-15 front panel controls and indicatorsControl Set-up Output Mic InputOntrols see Figure Compressor Controls Equalization Controls Initial Set-Up Benc h TestFearn Preamp Section E O RY O F O P E R AT I O NCompression Section VU Meter and Meter Amplifier Fearn I N T E N a N C E VU Meter Calibration Factory Check-Out TroubleshootingWarranty Repair

VT-15 specifications

The Crown Audio VT-15 is a robust loudspeaker system that has gained recognition for its advanced technologies and impressive audio performance, making it ideal for various applications, including live events, installations, and broadcast scenarios. Built with durability and sound quality in mind, the VT-15 serves both professionals and enthusiasts in the audio industry.

One of the standout features of the VT-15 is its high-efficiency design, which is achieved through advanced driver technology. The loudspeaker is equipped with a premium 15-inch woofer that delivers powerful low-end reproduction, ensuring a solid bass presence that enhances the overall listening experience. This, combined with a high-frequency compression driver that operates at 1 inch, ensures clear and articulate treble frequencies, resulting in a balanced sound profile suitable for different musical genres.

The VT-15 incorporates Crown’s patented Waveguide technology, designed to provide consistent and controlled sound dispersion. This feature allows the loudspeaker to effectively cover large areas without experiencing significant drop-off in audio fidelity, making it a great choice for medium to large venues. The controlled directivity also means that listeners in various positions within the space can enjoy a similar audio experience, enhancing the performance of any event.

Another defining characteristic of the VT-15 is its rugged construction. Built with a reinforced enclosure, it is designed to withstand the rigors of touring and heavy use in fixed installations. The cabinet is constructed from high-quality materials that minimize vibration and resonance, further contributing to the clarity of sound. Its lightweight design allows for easier transport and setup, making it a practical choice for audio professionals on the go.

In terms of connectivity and compatibility, the VT-15 features versatile input options, allowing it to integrate seamlessly with various audio systems. Whether used in conjunction with other Crown products or compatible equipment from different brands, the VT-15 ensures flexibility in configuration.

Overall, the Crown Audio VT-15 stands out as a high-performance loudspeaker that combines advanced technologies, durability, and sound fidelity. Its powerful drivers and innovative design make it a reliable choice for any professional audio application, providing users with the quality and performance they demand. Whether for live music, presentations, or installations, the VT-15 delivers exceptional audio experiences that elevate any event or setting.
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