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World Renowned Cathedral Gets World Class Sound with Iconyx

St. Louis, MO – November 2013… Completed in 1914, the Cathedral Basilica of Saint Louis is renowned for its breathtaking mosaic works — one of the largest in the world. Comprising more than 41.5 million pieces, and covering 83,000 square feet, the mosaics display took more than 75 years to complete, and draws visitors from throughout the world.

The 2000-seat cathedral’s architecture is as exquisite as it is acoustically challenging, capped with a massive dome that soars to 150 feet high at its center. “It’s an exceptionally challenging environment,” explains Gary Haselhorst, President of Valley Park, MO-based Cignal Systems. “There are so many concave surfaces, with 360 degrees of windows, and the dome just exacerbates everything. There’s not a soft surface in there — marble floors, hard pews — and there are transepts on either side that create even more reflections.”

Not surprisingly, the Cathedral has struggled to find a sound system that could cope with such a challenging space. “The old system was simply ineffective,” says Haselhorst. “They had about twenty 12-inch two-way cabinets around the perimeter, hung at about 30 feet in the air. There was a very fine line between enough volume and too much volume. If we brought up the direct feed too high the room would go into feedback.”

The solution presented itself in the form of Iconyx digitally steerable column arrays from Renkus-Heinz. A pair of Iconyx IC32-R-II columns are installed left and right of the altar platform. As Haselhorst explains, the Iconyx was a clear and obvious solution.

“As proof of concept, we took a single Iconyx 32 into the Cathedral, put it stage right of the altar sanctuary area, and steered the beam away from the reflective surfaces. Even with one speaker, we were miles beyond the existing sound system.”

Haselhorst adds that the 32-element column was exactly what was needed in this reflective space. “We didn’t need the SPL, but we needed the low frequency control. Below 250 Hz, the RT in that room is unmanageable.”

A second set of Iconyx IC16-R-II columns are mounted midway back in the room as delays. “We could have easily hit the back of the room with the mains, but the transepts created another issue. If we aimed the beam high enough to hit the back of the room, we were hitting the transepts too. Using the IC16 columns as a delay kept us from having to push the front elements too hard and hitting the transept walls.” Time alignment is handled within the Iconyx software. A pair of Symetrix Radius units provides additional signal processing.

The Iconyx also offered a low-profile, streamlined design that blended well with the decor. “We custom painted them to match the walls,” says Haselhorst.

The new system has made an immense difference, says Haselhorst.  “We took down twenty loudspeakers that were aimed all over the place, and replaced them with four sources that are aimed with precision. You can hear someone now as if you were talking to them ten feet away.”

Haselhorst says the best compliment was from the archbishop himself. “He said that now he can pull up his old sermons and reuse them, and this time people will be able to hear them.”

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Headquartered in Foothill Ranch, California, Renkus-Heinz, Inc. is the worldwide leader in the design and manufacture of audio operations networks, digitally steerable arrays, powered and non-powered loudspeakers, system specific electronics and fully integrated Reference Point Array systems.

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