Rob Jaczko Transforms Space Via Small-Room Acoustics Software
[Editor’s Note: This is not a typical product review. As Mix has learned over the years, certain new technologies demand more than opening a box or downloading software to accurately evaluate. To accurately assess NIRO, the new small-room acoustics software from WSDG and REDIacoustics, we needed to find an engineer who was going through the process. Mix reviewer Barry Rudolph found an excellent source in Rob Jaczko, who continued his 20-year relationship with John Storyk, co-founder of WSDG and REDIacoustics, when he employed NIRO in creating his home-based Abbott Road Studio.]
Rob Jaczko is Chair of the Music Production and Engineering Department at Berklee College of Music in Boston, Mass. In addition to overseeing the program’s faculty and all the studios at Berklee, he now operates his own personal, professional studio at his residence just outside of Boston.
Abbott Road Studio is an “all-in-one,” 600-square-foot room measuring 19 feet wide by 32 feet long, with a 14-foot, A-frame ceiling. The all-in-one approach for a personal studio has become popular for two primary reasons.
First when built within an already existing structure, it usually means there will be no major remodeling or new construction required. Secondly, with music written, composed, produced and performed in a single room, the ability to reconfigure a space for nearly any use, from recording drum kits to big guitar amps to vocals, is attractive.
“Presently, I have a drum-set, piano, synths, keyboards and amps all in the room,” Jaczko says. “I like the open, ‘black box’ nature of being able to reconfigure the setup given the circumstances.”
Jaczko’s loft-like studio has an open-air feel and is located above a large garage that is detached from the main house; there are no particular requirements for acoustic isolation, either from sound exiting or entering the studio. That was a boon, as incorporating effective sound isolation can easily double or triple construction costs.
“This house and property has been in my wife’s family for nearly 120 years; my family has lived here for the last 17 years after we moved back from L.A.,” Jaczko explains. “This room has always been an open music and hangout space for my kids, but over the last six years, it has evolved into my personal studio.”
The room was never intended to be an actual, viable recording studio capable of producing consistent professional results. It included plenty of hard, reflective surfaces, causing excessive decay times that made critical listening impossible. With access to more than 20 pro studios at the Berklee campus, Jaczko had found little reason or need to invest in a home studio.
All that changed in early 2020 with the appearance of COVID-19. The lockdown put the brakes on all normal collaborative processes, and finding an open commercial studio became difficult at best. For Jaczko, and so many other audio professionals, the pandemic brought to light the realization that having control over access to a recording studio/space is a necessity—even if only for editing and mixing.
Upgrading his room with balanced monitoring and acoustics would allow Jaczko the ability to continue recording and mixing music for film, jingles and TV projects. In addition, the larger footprint of his room meant he could accommodate tracking three- or four-piece ensembles, small string and/or brass sections, or record vocal groups.
WORKING WITH EXISTING SPACES
Converting existing residential spaces—spare bedrooms, garages, etc.—into DIY recording studios is generally viewed as specialized home-remodeling projects with minimal thought and knowledge of acoustic science and the way sound behaves in small rooms.
In acoustically untreated rooms, there are typical endemic problems that have to be addressed in order to create a “clean acoustical palette with minimal sonic distortion.” Ideally, instead of employing DSP to electronically tune monitor speakers to “correct” the peculiar issues of the space (modal buildups/cancellations), it would be better if the room’s mix position from the get-go had as close to a flat frequency response and uniform temporal decay as possible.
One of the current DIY trends for converting existing spaces into studios is to apply commercial, premade acoustic materials—various cloth-covered absorptive or diffusive panels (or sections of sculpted polyurethane foam) onto the walls and ceilings, with the goal of reducing or controlling unwanted sound reflections between these surfaces in a meaningful way.
But without accurate measurements of the room’s physical dimensions and acoustical response to determine its actual problems, the application of these treatment panels is often, at best, scatter-shot. Off-the-shelf acoustic treatment products are not necessarily bandwidth-specific, and if they are placed incorrectly, they can be detrimental by being either overly absorptive in the wrong frequencies or not enough in others.
The initial design/acoustic goal in any personal studio is a flat frequency response and minimal sound reflections at the listening position—where critical judgments and decisions are made about the sound. It is very expensive (and nearly impossible) to obtain flat response throughout an existing residential room not originally built for it.
Jaczko’s room suffered from an excessive RT60 measurement, exhibiting reflections and decays that made accurate listening impossible. He knew from the beginning that he would have problems with low-end reproduction.
Sound reflections in rooms come in many insidious forms. There are distractive room (modal) resonances that occur in certain locations in a space based on its physical dimensions, and there are Speaker Boundary Interference Response problems that have to be flattened or averaged. Optimizing the room’s geometry, as well as introducing an organized distribution of frequency-dependent dampers, can lead to minimized and uniform decay times in the low frequencies required for “tight” bass, and most important for mixing and/mastering music.
It is perhaps most important to reduce the early reflections that occur between the direct sound coming from the speakers and the side and rear walls, as well as certain furniture and equipment elements.
Abbott Road studio is 32-feet long, giving it a bit of an advantage with respect to control of rear-wall reflections. Organizing these early reflections while at the same time avoiding making the room too dead was certainly a design consideration. Many engineers find that overly dead rooms exhibit a very narrow sweet spot around the listening position and are not always comfortable to work in over many hours.
THE NIRO PROCESS
“I have an over 20-year relationship with John Storyk and the Walters-Storyk Design Group team,” Jaczsko explains. “Recently, I had been aware of their ambition to develop a new analysis tool specifically targeting low-frequency issues in non-cuboid spaces. My room is decidedly non-cuboid, with a high-pitched ceiling forming a trapezoidal cross section.”
After two years of development, WSDG’s newly formed research company, REDIacoustics, has released NIRO, a new analysis tool based on Non-Cuboid Iterative Room Optimization.
Clients begin the NIRO process by outlining the studio’s architecture, along with a discussion of the goal for the room based upon the cubic volume, shape, vertical size, speaker range (soffit-mounted or nearfield), subwoofer(s) and equipment list, and whether there is to be space for a console.
Preliminary drawings are made; these can be either for an all-new room or overlaid over an existing room’s plans. Jaczko supplied the blueprints from the room’s original construction. With accurate room blueprints, the next step is the collection of acoustic measurements—more specifically, mix position impulse response information.
Measurement of the room’s acoustic signatures can be handled by REDIacoustics or WSDG personnel onsite, or the data can be supplied by the client as long as it meets the specifications needed. In this case, Jaczko gathered the data, with a little guidance from the WSDG team, using Room EQ Wizard analysis software and a calibrated measurement microphone.
“Since this project began during COVID lockdown in 2020, I made the measurements by myself while receiving direction on a Zoom call with Andy Swerdlow, a senior engineer at WSDG,” Jaczko explains. “The REW software generates a number of frequency sweeps for recording at various locations in the room. This process is repeated numerous times to obtain separate measurements for only the left and right speakers, and with and without my two subwoofers engaged. It was not hard work to do the measurements, especially with Andy’s help.”
For Jaczko’s studio, the NIRO process, including the initial analysis, computations and 40-page report was completed in a week.
“The NIRO process pinpoints optimized geometry as well as specific frequency-dependent damper locations,” says John Storyk, founder of WSDG. “It rarely specifies large, broadband bass traps that require quarter wavelength–deep cavities filled with hanging Fiberglas/wood/Fiberglas panels. Today’s studios are relatively small and require especially designed thin low-frequency control panels. Our Acoustical Parametric EQualizers (APEQ) are less than 6-inches thick, custom-designed, and built and then positioned exactly to treat the problematic frequencies.”