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About Room Equalization
42
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www.velodyne.com
Digital Drive User’s Manual
T
his section gives some background on room equalization. As a sub plays in a room, the
reflections of the sound waves off the walls create “standing waves,” that is, places in the room
where certain frequencies are louder and others are diminished. In addition to standing waves,
every room will also have locations where cancellations of the sound waves are like black holes
that no amount of attenuation can fill. Thus as a general rule it is better to “cut down” a peak
of response rather than to “boost up” a valley (i.e. possible black hole) of response.
In general, you are looking for a frequency response that is +/– 3 dB at all frequencies (it is
highly doubtful that 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 frequency with the satellites. While the goal is perfectly flat
response, this may not be possible in the higher frequencies of the subwoofer’s response due
to peaks or valleys introduced by the satellites.
Your new subwoofer is equipped with special protection circuitry to provide maximum
performance with greatest reliability.
The unit is protected against:
1. Overdriving the speaker or amplifier.
2. Over
heating the amplifier.
3. Excessive dr
op in power line voltage.
The first type of protection circuitr
y that prevents overdriving of the speaker or amplifier
operates constantly without being audible under most situations. In some extreme situations
(sustained high output levels such as pr
o sound usage), the unit may shut down momentarily.
This indicates operation of the thermal or under voltage protection circuitry. If this should
happen, you should reduce the volume setting or shut the unit off until normal operating
conditions return. You may also want to plug the unit into a different wall outlet, as dropping
power line voltage will be most noticeable under strenuous conditions.
Do not use any harsh detergents or chemicals to clean the cabinet. Abrasives, detergents, or
cleaning solutions may damage the finish on the cabinet. We recommend using a damp cloth
to clean the cabinet. During nor
mal conditions, your new subwoofer may be left on continuously
without any problems. The unit is equipped with a signal
-sensing turn on/off that will
automatically tur
n on the unit when a signal is pr
esent at the inputs and turn off the unit after
several minutes when ther
e is no longer any signal at the inputs. If you plan to leave the
subwoofer unused for an extended period of time, we recommend that you unplug the unit.
Protection Circuitry
Car
e of Your Digital Subwoofer