Cross-Spectrum Acoustics

Cross-Spectrum Acoustics LLC (CSA) was formed in August 2011 by Herb Singleton and Lance Meister. CSA is a full service noise and vibration consulting firm and our two partners have over 30 years combined experience in the noise and vibration field, with specialties in: Rail transit, Construction, Architectural acoustics, Industrial noise, Audio systems. Our staff has authored numerous technical papers and teaches courses on noise and vibration across the country. CSA consultants are active members of the acoustics and transportation professional communities. We work with our clients to offer cost-effective solutions to acoustical problems. CSA takes pride in our ability to help the public understand complex issues related to noise in a simple and straightforward manner.

Company details

P.O. Box 540609 , Waltham , MA 02454 USA

Locations Served

Business Type:
Consulting firm
Industry Type:
Health and Safety - Noise and Vibration
Market Focus:
Nationally (across the country)
Year Founded:


Cross-Spectrum Acoustics (CSA) is a full service noise and vibration consulting firm formed in 2011 by Herbert Singleton and Lance Meister. CSA was formed to provide high quality noise, vibration and acoustical services to a wide variety of clients at a reasonable cost.

Our staff have over 30 years’ experience in noise, vibration, and acoustics for a variety of clients and market areas. We have authored numerous technical papers on noise and vibration. CSA consultants are active members of the acoustics and transit professional communities, including organizations such as:

CSA takes pride in our ability to help the public understand complex issues related to noise in a simple and straightforward manner. Because noise and vibration can be a very complex subject, our staff works to make a highly technical subject accessible to everyone, while still providing the information needed.

Another CSA hallmark is our belief that high quality work does not need to have a high price tag. We are diligent in keeping our costs low in order to offer rates that provide maximum value to our clients. We also collaborate with our clients to offer cost-effective solutions to their acoustical problems.

Cross-Spectrum Acoustics (CSA) provides noise, vibration and acoustics consulting services in several market areas, including:


Our staff have taught the NTI/FTA training courses on transit noise and vibration across the country for the past 10 years. Mr. Meister is one of the authors of the Federal Transit Adminstration’s guidance manual on noise and vibration. Mr. Singleton prepared the General Assessment spreadsheet used and distributed by the FTA.

CSA has experience on projects ranging from preliminary assessments to environmental impact statements to final design of systems. We have experience with all types of transit modes, including: light rail transit (LRT), bus rapid transit (BRT), streetcar, heavy rail, commuter rail, intercity and high-speed rail, and freight rail systems. CSA staff have provided noise and vibration consulting on transit projects at locations throughout the US, including:

  • Dallas, TX
  • Sacramento, CA
  • Houston, TX
  • Los Angeles, CA
  • Seattle, WA
  • Portland, OR
  • Austin, TX
  • Chicago, IL
  • Boston, MA
  • New York, NY
  • Phoenix, AZ
  • Philadelphia, PA
  • Camden, NJ
  • Norfolk, VA
  • Atlanta, GA
  • Washington, D.C.
  • San Jose, CA
  • St. Louis, MO
  • Cleveland, OH
  • San Francisco, CA
  • Denver, CO
  • Salt Lake City, UT
  • Anchorage, AK
  • Minneapolis, MN
  • San Juan, PR
  • San Diego, CA

CSA staff have conducted noise and vibration assessments for both the FRA and STB, including the UP-SP merger, the Conrail merger with NS and CSX, the CN-IC merger, and numerous projects for the Alaska Railroad. Mr. Meister also helped to author the FRA’s locomotive horn noise rule, and design the FRA’s horn noise model, used to assess noise at grade crossings. More recently, CSA staff worked on the St. Louis Park freight rail relocation project, which involved shifting freight traffic onto a lightly used corridor through a residential neighborhood, and the Springfield (IL) Rail Consolidation project, which involved rerouting and consolidating freight traffic through Springfield to minimize impacts to the community.

CSA staff have also worked on high-speed rail projects around the country, including projects in California, Florida, Illinois, New York, Nevada and New England.


CSA has extensive experience with construction noise and vibration. Both of our Partners were involved in the Central Artery project in Boston, the largest public works project in the nation at the time. Working on a project of this magnitude gave us unparalleled experience with construction equipment, mitigation measures and community response to noise, especially at night.

We have used our experience to analyze construction noise on large transportation projects, stone processing operations, demolition and even residential excavation. We know from our experience that noise mitigation on construction projects may entail significant costs and project delays so we work with stakeholders to recommend effective measures that can be implemented quickly by contractors at minimal cost.


CSA has experience on a wide variety of architectural acoustics projects for learning spaces, office environments, auditoriums, and transit spaces. We have performed analyses of speech intelligibly, sound isolation between spaces, and. structure-borne noise caused by MEP sources. We can measure acoustical paramters such as reverberation time (RT60), field sound transmission class (STC) and speech transmission index (STI) to help resolve interior acoustical problems. We use customized computer models and reference literature to predict future sound levels and to recommend appropriate mitigation measures.


CSA has worked on a wide range of community noise projects, from measuring HVAC exhaust noise and chicken crowing to power plants and car washes. We’ve also performed industrial noise measurements to determine compliance with OSHA hearing conservation regulations. CSA staff have significant experience in assisting developers with their permit applications and helping community groups solve noise problems by recommending cost-effective noise mitigation measures.

CSA has experience with numerous wind turbine noise projects. We have worked for both wind turbine project developers and community groups in assessing the noise effects of wind turbines and applying the appropriate set of criteria to estimate any impacts.

Our consultants are well versed in the complex set of noise issues related to wind turbines. We can assist with siting issues, pre-construction noise measurement programs, modeling of noise effects of wind turbines on local communities using state of the art computer programs and post-construction noise monitoring to determine compliance with noise regulations.

CSA staff have assisted a number of manufacturers of audio and industrial equipment to characterize and improve the acoustical performance of their products. We have assisted clients in the design of audio transducers, flow silencers, vibration isolators and analysis systems. We have also used our measurement systems that signal-processing methods to overcome high-noise environments. We specialize in using commerical off-the-shelf products to create precision measurement systems at minimal cost.

Through Cross-Spectrum Labs, we offer microphone and sound level meter verification services for manufacturers, hobbyists and professionals.

California high-speed rail project, Merced-Fresno, CA

CSA is currently working on the noise and vibration portion of the Merced-Fresno segment of the California High-Speed Rail Project (CA HSR). The CA HSR project is the largest high-speed rail project in the United States. The Merced-Fresno portion is one of two segments applying for ARRA funding, and will be the first two through the environmental process. The Merced-Fresno segment consulting team has been at the forefront of policy and process formation for the entire project. CSA staff have worked on the analysis of the noise and vibration data, directed the modeling of the impacts and written the noise and vibration technical report and EIS/EIR section. CSA staff also developed the project wide noise and vibration mitigation guidelines, used by the consultant teams on all the project segments.

FTA noise and vibration impact assessment training courses

CSA staff have been instructors for the FTA’s noise and vibration impact assessment training courses for over 10 years, with the most recent courses in Baltimore, MD in September 2011 and Portland, OR in December 2011. The three day course, sponsored by the National Transit Institute, covers the entire noise and vibration guidance manual, including screening, general and detailed assessments for noise and vibration, along with information on mitigation measures and construction noise and vibration. CSA staff have taught over 300 students, including consultants, state DOT and agency staff, and FTA regional and headquarters staff.

Wind turbine noise assessment, Falmouth, MA

CSA staff provided subconsulting services to the town of Falmouth MA in support of noise measurements for the turbine installed at the town’s wastewater treatment plant. We assisted with the long-term and short-term noise measurements at homes near the turbine to determine ambient noise levels, and noise levels when the turbine was operating. We also performed source reference levels of the wind turbine to determine if the turbine met the manufacturer’s noise emission specification.

Massachusetts Bay transportation authority transit station upgrade project, Boston, MA

CSA staff worked with a team of consultants and engineers to upgrade public address systems in three stations along MBTA transit lines. Mr. Singleton directed the fieldwork for the project which involved quantification of noise from station sources such as rail vehicles and HVAC systems, acoustical testing to determine speech intelligibility characteristics of the existing public address systems, and analysis of system components to aid to sound system design.

Airport noise monitor assessment

CSA provided field measurement services at one of the world’s busiest airports to help assess the performance of a newly installed airport noise monitor. We measured noise from aircraft takeoff and landings, and correlated various noise metrics with aircraft type and directions.

Microphone quality control support

CSA worked closely with Soundwave Research Labs, a manufacturer located in Ashland MA, during the development of Crowley & Tripp Microphones. We provided independent testing services to assess the performance of the Studio Vocalist, Soundstage Image, and Proscenium microphones. In addition to measuring the performance of the Crowley & Tripp microphones, we also measured competing microphones to provide a suitable baseline. We developed specific recommendations for a customized acoustic test fixture for use in internal quality assurance processes.

Car wash noise assessments

CSA worked with F. L. Roberts & Co Inc. in support of proposed car wash facilities in Springfield MA, and Farmington CT. We measured noise levels at existing car wash facilities and used the data to model car wash noise at proposed locations. We compared the modeled car wash levels with relevant noise ordinances, and recommended noise mitigation measures where necessary. We also presented the analysis results before the Farmington Planning Board and the Springfield City Council.

Health club noise study

In response to noise complaints from a neighboring business, CSA was hired by a Curves for Women franchise in the Boston area to help assess the problem. We performed sound measurements in adjacent offices and exercise spaces to determine sound transmission through shared partitions. We compared the data with relevant Noise Criteria and Speech Intelligibility standards to determine impact. We recommended cost-effective mitigation measures to reduce sound transmission from the health club.