Velodyne DIGITAL DRIVE SERIES User Manual

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Velodyne DIGITAL DRIVE SERIES User Manual Manual pdf 47 page image

www.velodyne.comDigital Drive Series User’s Manual - 41ABOUT ROOM EQUALIzATIONThis section gives some background on room equalization. As a sub plays in a room, the reflections of thesound waves off the walls create “standing waves,” that is, places in the room where certain frequencies arelouder and others are diminished. In addition to standing waves, every room will also have locations wherecancellations of the sound waves are like black holes that no amount of attenuation can fill. Thus as a generalrule it is better to “cut down” a peak of response rather than to “boost up” a valley (i.e. possible black hole) ofresponse.In general, you are looking for a frequency response that is +/– 3 dB at all frequencies (it is highly doubtfulthat your ear can tell a response that is any better than this). The response will always roll off at the low end(according to the settings of the subsonic filter), and there should be no dip or peak at the crossover frequencywith the satellites. While the goal is perfectly flat response, this may not be possible in the higher frequenciesof the subwoofer’s response due to peaks or valleys introduced by the satellites.PROTECTION CIRCUITRyyour new subwoofer is equipped with special protection circuitry to provide maximum performance with greatestreliability.The unit is protected against:1. Overdriving the speaker or amplifier.2. Overheating the amplifier.3. excessive drop in power line voltage.The first type of protection circuitry that prevents overdriving of the speaker or amplifier operates constantlywithout being audible under most situations. In some extreme situations (sustained high output levels such aspro sound usage), the unit may shut down momentarily. This indicates operation of the thermal or under voltageprotection circuitry. If this should happen, you should reduce the volume setting or shut the unit off until normaloperating conditions return. You may also want to plug the unit into a different wall outlet, as dropping powerline voltage will be most noticeable under strenuous conditions.CARE OF yOUR dIGITAL dRIVE SUBWOOFERdo not use any harsh detergents or chemicals to clean the cabinet. Abrasives, detergents, or cleaning solutionsmay damage the finish on the cabinet. We recommend using a damp cloth to clean the cabinet. During normalconditions, your new subwoofer may be left on continuously without any problems. The unit is equipped witha signal-sensing turn on/off that will automatically turn on the unit when a signal is present at the inputs andturn off the unit after several minutes when there is no longer any signal at the inputs. If you plan to leave thesubwoofer unused for an extended period of time, we recommend that you unplug the unit.