User manual ELECTRO-VOICE 6001RB

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Manual abstract: user guide ELECTRO-VOICE 6001RB

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[. . . ] 17 Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Characteristics of Gradient Arrays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Advanced Gradient Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Gradient Line Arrays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Beamformed; trim height 65ft (~20m). Flown Center Subbass Line Arrays. Where staging and rigging considerations permit, a flown center stack of subwoofers can give excellent results. There is zero lobing, the horizontal coverage is essentially 360°, and the vertical coverage can be controlled well by beamforming. Figure 21 shows the coverage of a flown center cluster of 12 EV Xsub woofers in an arena venue. The woofers are hung in a straight line, an optimized set of beamforming delays are applied. The result is a subbass coverage pattern that maintains constant tonal balance over the entire listening area and In this example, the delays have been applied in pairs. This is more economical than having a separate drive and amplifier channel for each woofer. However, should a separate drive channel per woofer be available, even better coverage would be possible. 15 6001RB · A PRACTICAL Blue 40Hz Red 60Hz Green 90Hz GUIDE REV. 1 / SEPTEMBER 18, 2009 Blue Red Green 40Hz 60Hz 90Hz Figure 21. Xsub x12 center flown in arena. Delay and Gain Top to Bottom 5 5 2 2 1 1 0 0 1 1 1 mSec mSec mSec mSec mSec mSec mSec mSec mSec mSec mSec -3 3 0 0 0 0 0 0 0 0 -3 dB dB dB dB dB dB dB dB dB dB dB 16 6001RB · A PRACTICAL GUIDE REV. Gradient Arrays A gradient array is an arrangement of loudspeakers driven at different amplitudes and phases in such a way as to cancel sound radiation in unwanted directions. In our example, the element spacing is 62 inches (157 cm), which gives a maximum operating frequency of approximately 90 Hz. The pattern deteriorates rapidly above the high-frequency limit, as Figure 26 shows. Red Blue Green Circles 90Hz 100Hz 120Hz 6dB Figure 26. Gradient pairs do not function correctly when they are situated in front of walls or other reflecting surfaces. Figure 27 shows what happens when our Xsub pair is placed two feet (60cm) in front of a wall. The two woofer boxes on the left are virtual boxes -- acoustic images created by the reflection in the wall. The two boxes on the right are the actual woofers. Blue Red Green Circles 40Hz 60Hz 90Hz 6dB Figure 27. Left-hand boxes are acoustic images of actual array, which is on the right. Thus, as the frequency goes down, they send proportionately more of their output into the reverberant field of the venue. This causes an excess of subbass (sometimes called "bass bloom") in the reverberant field. Unlike almost all other kinds of loudspeakers, gradient loudspeakers maintain pattern control down to the lowest frequencies. Thus, they can be helpful in applications where a full subbass experience is needed, but without too much reverberant low-frequency energy. [. . . ] 1 / SEPTEMBER 18, 2009 Appendix B: Subbass Equalization Some mix engineers like to use systems with built-in bass boosts. Here, for example, is a curve used in stadiums and arenas by well-known male vocalist with whom the author is familiar: 20 10 0 -10 20 100 1k 10k 20k Figure 35. System bass boost To achieve frequency response curves like these, it is traditional to increase the gain of the subwoofer channel. The problem with this practice is that changing the gain of subwoofers only can affect the behavior of the subwoofer crossover in unexpected ways. [. . . ]

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