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Architecture, Acoustics, and Audio Complement Each Other at Duke University Auditorium - AvNetwork.com

Architecture, Acoustics, and Audio Complement Each Other at Duke University Auditorium

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This fall, Duke University showed off its newly renovated Baldwin Auditorium, a 685- seat performance hall that is home to the school’s music department, as well as touring acts booked through the college’s on-campus agency, Duke Performances.

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For the renovation of Baldwin Auditorium at Duke University, Jaffe Holden and the architects created a room within a room to improve sound for acoustic, unamplified, and amplified performances.

One of the main goals behind Baldwin’s facelift was to drastically improve sound for acoustic, unamplified, and amplified performances. Working in conjunction with Ray Walker, Duke’s staff architect, as well as Pfeiffer Partners Architects out of New York, NY , the Norwalk, CT-based consulting firm Jaffe Holden was charged with designing the acoustics for the space—including noise control and isolation—as well as the design of the audio system.

Matthew Nichols, consultant at Jaffe Holden, explained that the original space was very wide, producing less than favorable acoustics. To address this, Jaffe Holden and the architects created a sort of room within a room by bringing in the side walls, creating new walls, and carving out space for outside of the auditorium that allows for circulation between the front of the house and the back. The new walls are fabricated out of three layers of drywall with articulating shaping, which provides diffusion around the entire auditorium. New wrap-around balconies were constructed, resulting in new vantage points for audience members, as well an opportunity to provide acoustical diffusion for unamplified musical performances. Signature to the space was an existing large-domed ceiling, which serves to conceal some acoustical diffusion properties as well, preventing reflection back onto the stage area.

Admittedly impressive is the overhead wooden canopy, comprised of individual members that curve in two directions. Gaps were designed into the canopy to allow for some of the sound from the stage to escape, and also to create space for lighting, rigging, and speaker arrays. Curved, wooden plugs can be flown out onto the speaker lift lines so that when the loudspeakers are removed, there is no evidence of holes.

One element that was expanded during this renovation was Baldwin’s stage, which now spans 2,000 square feet. To supply air to this area, the stage is constructed out of perforated wood—over 75,000 holes were drilled into the flooring, which houses an air supply plenum underneath. “It’s almost like an air hockey table,” Nichols joked.

Ben Bausher, senior consultant at Jaffe Holden, noted that because the renovation did not involve a building expansion, there was little, if any, room for amplifiers, necessitating a self-powered loudspeaker system. “And whenever you think of a self-powered speaker system that needs to be touring rider-compliant, the next thing you think of is Meyer Sound,” he said. And, not only did the system need to be self-powered, it also needed to be as small as possible in order to meet the architect’s requirements. “Well luckily, Meyer Sound has the MIN A, which is one of the smallest line arrays out there. So all roads led to Meyer from that aspect.”

The main arrays are each comprised of 10 Meyer MIN As. Ten Meyer UP-4XPs act as front fills, with a pair of MM-4XPs for side balcony fills and two UPJ over-balcony fills. Four Meyer 500-HP subwoofers, mounted on isolation platforms, are integrated into the stage apron. The speakers are on motorized winches so that when the auditorium is being used for acoustic performances, they can be dismounted and stored on carts.

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The main arrays are each comprised of 10 Meyer MINAs.Audio & Light, based in Greensboro, NC, headed up the installation of the audiovisual systems, which included sound reinforcement, assistive listening, presentation video routing, and auxiliary systems, such as intercom and paging. Brian Cox, design engineer and vice president of sales for the installation division of Audio & Light, noted that while his firm was called in relatively late in the project, there were few of the usual challenges that arise as a result. He credits this to Jaffe Holden’s design: “Jaffe did a great job in designing the audio coverage for the room, with the right boxes, and we believe it came out phenomenal and sounds phenomenal,” he said. “It turned out, I think, to be a great project for everybody.”

Jaffe Holden designed the acoustics to be adjustable— users can literally tune the room to suit their needs. Acoustical treatments such as the large upstage curtain, the banners on the upper side walls and at the rear of the balcony, and the acoustic drape located at the orchestra level, underneath the balcony soffit, are all motorized and controllable via presets that are programmed into a Graphical User Interface (GUI ). “We had tuning sessions over [the course of] three days where we listened to a wide variety of musical groups—both amplified and unamplified—and we located the musicians on stage to find the acoustic sweet spot [for them], depending on whether it was a piano or a violinist,” Nichols explained. “We notated all of those positions as well as the best acoustic setting for the banners—whether they needed to be half in or fully deployed— and all of those are on custom presets.”

For Bausher, the Baldwin Auditorium project is an example of true integration between architecture, acoustics, and audio. “They were so joined at the hip in order to make the building work,” he said. “We needed to create a cohesive look that represented the old architecture, and that took it forward into the future as well.”

Carolyn Heinze is a freelance writer/editor.

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