User manual ELECTRO-VOICE Q SERIES BROCHURE
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Manual abstract: user guide ELECTRO-VOICE Q SERIESBROCHURE
Detailed instructions for use are in the User's Guide.
[. . . ] Professional Power Amplifiers
a heritage of power and performance
Each new generation of Electro-Voice amplifiers inherits more than 60 years of experience in amplifer design and manufacturing. From the beginning, Electro-Voice has always considered the audio quality of an amplifier to be as important as the output power and reliability. [. . . ] However, music signals are far more dynamic than sine waves, comprising a pulsed wideband spectrum. We at EV believe that, above all figures, the tonal performance of live music counts most; therefore, all of our amplifiers are designed for dynamic headroom. This means that each and every EV amp has at least 30% more output capability for short-term signals, when compared to a long-term sine wave value. This additional headroom results in an amp that will, for example, allow for short term signal peaks of at least 780W when spec´d 600W. While dynamic headroom is audible when playing music through a sound system, another specification to observe is the increase in output power from an 8 Ohm load to 4 Ohms, and then down to 2 Ohms. Of course, all Electro-Voice amplifiers are designed to be absolutely stable into loads of 2 Ohms.
Sine wave and music signal on the output of an amplifier.
30% b a Specified output power, measured with sine wave signal. b The dynamic headroom designed into Electro-Voice amplifiers allows maximum dynamic response from music signals, providing more punch and power than other equally spec'd amps
When processing dynamic signals, other important criteria are signal speed and dynamic distortion. For example, kick drum signals carry pulses of many frequencies as an overlay spectrum. Therefore, and in contrast to many other manufacturers, EV specifies a lot more information on their amplifiers' dynamic behavior than just "slew rate" figures. Important tests referring to the amp´s ability regarding multitone signal pulses are expressed by IMD-SMPTE measurements at high power levels. And, while IMD tests show the Intermodulation Distortion behaviour (how much "sound" is added by the amplifier), DIM30 is the real spec for speed in an amplifier. All these tests are carried out in EV labs during an amplifier's design phase, to ensure maximum sonic performance. [. . . ] Room 508-509, 5/F, Topsail Plaza 11 On Shum Street Shek Mun, Shatin HK Phone: +852 2351-3628, Fax: +852 2351-3329
Shanghai: Telex EVI Audio (Shanghai) Co. , Ltd. Room 3105-3109, Tower 1 Office Building, 218 Tian Mu Xi Rd. , Shanghai, China Postal Code: 200070 Tel: +86 21-6317-2155 Fax : +86 21-6317-3025
©2009 Bosch Security Systems, Inc. [. . . ]
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