Paul Brown Stadium Re-Energizes with Custom RCF Loudspeakers

Durrel Sports teamed up with RCF to deliver its concert-ready, signature sound to the Cincinnati Bengals' home field. With more than 580 large-format speakers among RCF catalog products and custom builds, Paul Brown Stadium recharged as one of the best sounding sports facilities in the US. All delivered on time despite the global pandemic.
 

For the last 20 years, the Cincinnati Bengals have been taking on NFL rivals at Paul Brown Stadium. This 65,515-seat gridiron arena that has always placed a premium on the strength and quality of its audio systems. Equally known as the site of performances by artists ranging from Kenny Chesney to Guns N’ Roses, PBS, as locals call it, subscribe to the notion that sound traveling throughout its concourses and seating areas should live up to concert-level expectations at all levels, whether it be on game day or for special events.

To that end, a three-phase project to re-energize the stadium’s original, 20 year-old audio blueprint was just completed this fall, debuting on October 4th before a reduced crowd that watched as the Bengals beat the visiting Jacksonville Jaguars. Designed and implemented by Nashville, Tennessee-based Durrell Sports Audio Management, the new system is an amalgam of workhorse legacy components, upgraded audio processing, and custom loudspeakers built in Italy expressly to meet the needs of this unique application by RCF.

“Paul Brown Stadium is unlike any other around the country when it comes to audio,” Durrell’s John Horrell explains. “Every aspect of its game-day production from simple announcements to music is as live as you can get. There is nothing here that even vaguely resembles a pre recorded TV show. That’s why when we were chosen to upgrade the audio we felt it was essential to create a system that was capable of true, concert-level high performance.”

The upgrade project was implemented in three phases, with the first kicking-off in 2018 and bringing, among other things, new delay loudspeakers from RCF to the upper deck and canopy level. Phase two added approximately 120 new RCF loudspeakers to the lower level and 70 more to the canopy level in 2019, along with eight dual 21-inch RCF subwoofers on each side of the canopy level.

Phase three of the project was approved in January 2020, so by February the job was underway, with Durrell working hand-in-hand with Louisville, Kentucky’s United Electric to turn the new vision into reality. As the pandemic tightened its grip globally on labor and material beginning in March, the design and install team steadfastly kept to construction deadlines with help from suppliers and manufacturers including RCF.

Based around a horn-loaded symmetric design, the custom HVL 15-L1 cabinets from RCF are outfitted with a pair of 15-inch drivers at the low-end, a pair of 10-inch midrange drivers, and two titanium dome compression drivers with four-inch voice coils at the top. All of the transducers feature neodymium magnets. With a frequency response of 43 Hz – 18,000 Hz (-10 dB), these three-way, long-throw boxes are driven in bi-amped mode and are capable of producing a maximum SPL of 133 dB (LF) and 145 dB (MHF). Horizontal coverage is 90°, while vertical coverage spans 30°.

The eight HVL 15-P1 loudspeakers built by RCF for the PBS installation share many of the same design characteristics as their 15-L1 brethren, once again operating in the same frequency range and employing a bi-amped, horn-loaded symmetric design, passive filtering between the mid and high-frequency sections, and the same external construction. Equipped with the same latest generation transducers as the 15-L1 across the board, the 15-P1s differ in that they offer 60° x 30° coverage.

Widely recognized for their ability to put serious sonic horsepower within the confines of a stadium while maintaining intelligibility and even coverage at every seat, Durrell spent a lot of time analyzing the Q values required of the system and had the custom RCF long-throw enclosures built accordingly. Q is the directivity factor of the speaker.

“Understanding the Q speaker values in a stadium environment is imperative to managing reflections,” Horrell says. “Q, of course, in its simplest terms, is the speaker ‘throw’ value—how far the audio carries away from the speaker. Designing the correct Q speaker values in PBS was our biggest challenge, and with proper processing plus the custom RCF boxes built right to our own precise specs, we created a distributed system that no matter where you’re sitting you won’t be annoyed by a loudspeaker intended to bring coverage to somewhere else.”

As for how the stadium sounds now from John Horrell’s perspective, he has this to say: “When we debuted the system the crowd may have been small, but it was very enthusiastic. We were all tickled to death with how it sounded. It had punch, and nothing was compressed to death. The linearity was great and evoked emotion—a pure presence that moved and excited everyone. OK, I’m an analog guy, but that’s hard to get out of a digital product. It additionally has dynamics that make it one of the better systems in the NFL. We could never have done this with line arrays, and given the history, this all should last another 20 years or more.”