The Buzz: Installation Spotlight: Doubletree Hotel Denver
Dec 1, 2008 12:00 PM, By Dan Daley
A change in the structural design after the project had been designed also meant that the 18 JBL Control 26C loudspeakers, powered by three Crown Audio CTs 1200 amplifiers, had to have their installation method adjusted. With the original hard points and rough-in boxes no longer available, the crew used aircraft wire to secure them to roof supports. Acoustically, large ballrooms can be difficult, but Hansson says that both the highly directional ceiling loudspeakers and the acoustical ceiling tile were helped by the padded hanging light fixtures the interior design team had chosen, in large part because of their deadening properties.
Speaking of acoustics, the lobby has a large sitting area inside a 25ft.-tall atrium illuminated during the day by large window panes at ground level and above. The JBL Control 26CT loudspeakers were mounted to standard ceiling tiles with flip-out wings, since they were smaller than the ballroom loudspeakers. Including the adjacent restaurant, the space was divided into eight audio zones, with each zone programmed to start at a certain volume level. For example, the restaurant dining area started at a 20-percent volume level, increasable in increments of 10 percent to a maximum of 60 percent of maximum volume.
“This limits the volume that the system can hit, but still gives the staff the ability to let the background music keep up with the ebb and flow of conversational noise in the lobby and bar,” Hansson says. “But at the bar, when the staff turns on the audio, it will start at 50 percent.”
Audio is distributed using a Crestron CNX-PAD8A eight-source/eight-room enhanced stereo audio-distribution system with a Crestron CP2E control processor. Ethernet is tied into the other subsystems for easy program changes and the ability to do global events.
The restaurant has a similar loudspeaker and touchscreen arrangement as the rest of the lobby control system, which is further programmed with different automatic volume levels for breakfast, lunch, and dinner sittings. Music is supplied from a DMX server in the control-room area. The island bar between the restaurant and sitting area presented its own challenge: It's covered in stainless steel for the top and backsplash, so the integrators had to coordinate the wiring of that area with the construction crew building the bar, carefully drilling with a carbide-tipped drill bit and threading the cabling inside to reach the two loudspeakers that are located in the brushed-stainless ceiling.
“Basically, we were running the wiring as they were building the bar, with them stopping construction of the next section while we were wiring the one they had just finished,” Hansson says.
A final section that received AV was the portico in front of the lobby entrance, a covered driveway with JBL Control 25 loudspeakers with a weather coat applied and set into the stucco concrete overhang. Between the ballrooms and the spacious atrium lobby, the project required some runs as long as 500ft. to 700ft. for both audio and video cabling to the control room in the lower-floor closet. Trenches were dug in the concrete flooring for conduit to be run horizontally, with cabling pulled through walls for vertical runs to ceiling loudspeakers. A Key Digital distribution amplifier system amped the signals on the longest runs and component HD video was used.
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