User manual PEAVEY CEQ 280A

[. . . ] Cover for CEQ 280a Peavey Electronics Corporation 1 Intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. Intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product. CAUTION: Risk of electrical shock ­ DO NOT OPEN!CAUTION: To reduce the risk of electric shock, do not remove cover. [. . . ] First, directional microphones 20 CEQTM 280a seldom have directional characteristics that are the same at all frequencies. Most become almost omnidirectional at low frequencies, which causes the frequency response to change as a function of how much sound enters the rear of the mic. Next, directional mics have a characteristic called "proximity effect. " This causes the bass to be boosted as the source gets close to the mic. Because most vocal mics are designed to be used up close, the low frequency response is reduced to flatten the response up close. This results in bass roll-off at a distance. Finally, mics intended to be hand-held often have reduced sensitivity at low frequencies to reduce handling noise. 7. 2 Creating a Microphone Curve Although it is recommended you use the Peavey AVR-1 microphone for automatic equalization, it is possible for youtocreateanewmicrophonecurveifyouhavethemicrophonefrequencyresponsecurvefromthemanufacturer of the microphone you intend to use. Note: Whatisneededforthisprocedureisthetrue microphonefrequencyresponsecurvefromthemanufacturer, not the optimized frequency response curves found in advertisement copy for a microphone. Use the left and right arrow buttons to position the cursor alongside "CREATE. " NEXT MIC: AVR1 INSTR CURVE1 CURVE2 EXIT CURVE3 CURVE4 CURVE5 *CREATE 4. Pressthe"NEXT"softbutton. NEXT EXIT Create new mic curve from: *INSTR The CEQ 280a defaults to "INSTR" because it is a flat curve. You can change this to use any of the stored curves as a starting point. Use the up and down arrow buttons to select the curve with which you want to start. Press the "NEXT" soft button and begin to enter your microphone curve. NEXT //////////////////////////// 0dB EXIT / //////////////////////////// 32Hz 6. When you have completed entering the curve, press the "NEXT" soft button to store the curve. STORE EXIT Store mew mic curve to: *CURVE1 7. Select from CURVE1 through CURVE5 as the storage location for your new microphone curve and press the "STORE" soft button. The following screen will be displayed briefly: STORE COMPLETE Peavey Electronics Corporation 21 7. 3 Room Target Curve Selection/Creation What is a target response curve?The target response curve is the system frequency response you wish to achieve after equalization. This is the curve you should see on the RTA display. High frequencies are absorbed by air at a greater rate than the low frequencies. There are few people who are used to listening to a snare drum or vocalist from one inch away. Most of the listening that we do is from a distance and that is what sounds natural. If a speaker system has a flat response the response, we would measure in the club or auditorium would exhibit a high frequency roll-off. [. . . ] Never break off the ground pin on the power supply cord. For more information on grounding, write for our free booklet "Shock Hazard and Grounding. " Power supply cords should always be handled carefully. Never walk or place equipment on power supply cords. Periodically check cords for cuts or signs of stress, especially at the plug and the point where the cord exits the unit. [. . . ]