HOUSTON, TX — Toyota Center, the arena home of the NBA Houston Rockets, recently installed a new L-Acoustics K2 sound system – the first K2 system permanently installed in a major professional sports arena. The cap to a two-year AV makeover that included new HD video scoreboards, the sound system, designed in Soundvision by project consultant Wrightson, Johnson, Haddon & Williams and AV systems integrator LD Systems with support from the L- Acoustics S US applications team, primarily comprises 72 K2 enclosures flown in six arrays.
The installation in the arena, which seats 18,000 for basketball and over 19,000 for concerts, was completed and tuned just in time for the start of the 2014-2015 NBA season, when the Rockets hosted the Boston Celtics on November 1. Underscoring the exceptional flexibility and range of the K2, the new system is also potentially available to be tied into by a slate of top concert artists in the fall, including shows by the Black Keys, Justin Timberlake, Usher and Fleetwood Mac.
“Sound quality in an arena is always a challenge, but we had some additional challenges on the Toyota Center project,” says LD Systems’ Kevin Broussard. “In addition to coming up with a line-source system design that would provide even and seamless sound coverage all the way around the arena, we were also instructed to use as many of the existing rigging points that had been used to support the old trap-box-style system as possible to keep the venue flexible for touring music shows. The K2 was the perfect solution for that thanks to its ten-degree inter-cabinet angling. That, combined with the K2’s power and throw, allowed us to use fewer boxes to achieve the same dispersion and SPL, so we didn’t need to use more rigging points than were already in place.”
Configured with two pairs of arrays facing the north and south sides of the arena, and one each facing the longer-throw east and west ends, the 10-degree inter-element flexibility assures virtually seamless coverage over 360 degrees and in the horizontal plane as well.
“This feature allowed us to limit the box count per cluster to 12, which significantly helped keep the sightlines clear,” says Broussard. “A line array in an arena has the potential for serious horizontal overlap between arrays, with a nightmare of phase cancellation between clusters and the possibility of comb filtering. But with the K2, there is minimal horizontal overlap, and the sound is uniform from top to bottom. With this kind of pattern control, we can be very, very precise.”
NBA arenas have also become famous for their low-frequency response, yet the Toyota Center setup uses only 18 K1-SB subs. This is possible, says Broussard, because the K2’s enclosure is so wide-ranging that most of the bass in the system is coming from the speakers; the subs are there to simply extend them.
“The K1-SB subs reinforce the low end, adding power and punch, but most of the bass is coming from the K2s themselves,” he marvels. “The system behaves very much like a touring concert system, yet it still maintains very high STI [Speech Transmission Index] readings.” These, says Broussard, range well above average, between 0.58 and 0.72 – “phenomenal,” in his words.
The install also included Six ARCS WIDE constant-curvature WST line-source enclosures aimed at the court sidelines, four 12XTi high-performance coaxial speakers used as center-court downfills and 29 LA8 and two LA4 amplified controllers.
For more info about L-Acoustics systems, go to www.l-acoustics.com.
