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Hersteller: Crate Amplifiers Dateigröße: 255.3 kb Dateiname: 0a049a2d-90d6-4616-9509-864a49c83b5b.pdf Unterrichtssprache:

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. CAUTION: NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. "IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL" "REFERREZ-VOUS AU MANUAL D'UTILISATION" "UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN" EXPLANATION OF GRAPHICAL SYMBOLS: "DANGEROUS VOLTAGE" "DANGER HAUTE TENSION" "GEFAHLICHE SPANNUNG" = = Congratulations on the purchase of your new Crate Pro Audio Live Sound Graphic Equalizer. These outstanding devices have been designed with the audio professional in mind, providing the degree of accuracy and level of qual- ity you demand. Their ease of use and straight-forward design lend them to use by novices as well. This owner’s guide is designed to acquaint you with the workings of these equalizers and how they may be used in your sound system and should be read through before using them. Table of Contents: An Introduction to Equalizers........................................................3 The LS1-131/LS3-231 Front and Rear Panels ................................6 The LS2-215 Front and Rear Panels ..............................................7 Using an Equalizer........................................................................8 Applications: Some Methods of Connection ...........................................9 Room Equalization ..........................................................10 Fletcher-Munson Equal Loudness Contours .....................10 Feedback Control ............................................................11 Creative or Enhancement Equalization ............................11 Technical Specifications .....................................back cover LS1-131/LS2-215/LS3-231 Constant Q Graphic Equalizers An Introduction to Equalizers: The Crate Pro Audio Live Sound Graphic Equalizers are available in two mounting configurations: a 1-3/4” single rack space (LS1-131/LS2-215) and a 3-1/2” double rack space (LS3-231). These equalizers are a perfect addition to any professional sound system, particularly the Crate Pro Audio systems. The Crate Pro Audio LS1-131/LS2-215/LS3-231 equalizers offer precision control of the audio spectrum. Some features of these equalizers include: • Balanced and unbalanced inputs and outputs • Constant “Q” bandpass filter sets for precision control • Two control ranges for greater accuracy • Hardwire switchable bypass from input jacks to output jacks for total elimination of the equalizer from the system • Peak LEDs to obtain optimal signal levels • High signal-to-noise ratio (greater than 94dB) and a wide frequency response (20Hz to 20kHz) • Flat phase response for accurate reproduction and stereo imaging • Very low THD (less than 0.01%) • Maximum input level of +22dBm • Variable low cut and high cut controls (LS1-131/LS3-231 only) • Built in power supply The LS1-131 and LS3-231 provide 31 bands of equalization at standard ISO center frequencies, 1/3 octave apart. They cover the entire audio spectrum from 20Hz to 20kHz. This allows precision control and fine tuning of your audio system. (The LS3-231 offers two channels of 31 band equalizers.) The LS2-215 provides two channels of 15 band equalization at standard ISO center frequencies, 2/3 octave apart from 25Hz to 16kHz. All of the new Crate Pro Audio Live Sound Equalizers incorporate constant “Q” multiple-feedback bandpass filter sets for high resolution with minimal interaction between bands (see Figure 1 below). Figure 1: Constant Q Response: Constant "Q" filters: width Inferior broad band filters: 200 500 of filter does not change with amplitude. 1k 2k 5k 200 500 width of filter changes with amplitude. 1k 2k 5k Amplitude (dB) Amplitude (dB) 0 0 200 500 1k 2k 5k 200 500 1k 1k1k 2k 2k2k 5k Frequency (Hz) Frequency (Hz) .. . .L H LL .H .H ..= lower frequency ..= lower frequency CL CL .= center frequency .= center frequency CC .= higher frequency .= higher frequency HH LS1-131/LS2-215/LS3-231 Constant Q Graphic Equalizers These filters have a relatively low “Q” thus preventing “ringing”. Ringing occurs when a filter instantaneously receives an input signal and hangs on to the signal for a period of time after it has stopped (see Figure 2 below). Figure 2: Q vs. Ringing: 1kHz TONE BURST INPUT SIGNAL STOP INPUT SIGNAL START 1kHz TONE BURST INPUT SIGNAL STOP INPUT SIGNAL START All three equalizers have a flat phase response (see Figure 3 below) for accurate sound reproduction with no coloration to your speaker system. This maintains pure stereo imaging without the “comb filter” effect. As your ear passes across the stereo plane of your system, the comb filter effect sounds like “peaks” and “nulls” in the response which can change the imaging dramatically. Figure 3: Phase Response: 10 20 50 100 200 500 1k 2k 5k 10k 20k FREQUENCY (Hz) PHASE (Degrees) 180 150 120 90 60 30 0 -30 -60 -90 -120 -150 -180 Smooth, flat phase response of the Crate Pro Audio equaliz...

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