Erich Thalheimer, BSME, INCE Bd. Cert., Acoustical Engineer

Erich Thalheimer has developed a niche specialty performing noise assessments for existing and proposed gun ranges.  This is due to the fact that Mr. Thalheimer is an accomplished competitive shooter ( with over 20 years of experience with firearms use, safety training, sportsmens clubs management and custom reloading.  The combination of Mr. Thalheimer’s professional vocation in acoustics with his personal avocation in the shooting sports makes for a gun range acoustical consultant second to none.

Example acoustical studies done for gun ranges include the following:

  • Nantucket Hunting Association, Nantucket, MA (2007 - 2016) – Performed a comprehensive noise study for a proposed gun range on Nantucket Island. The study involved live firing of multiple rifles, pistols and shotguns from the proposed range location, and measuring and evaluating the noise levels in neighborhoods surrounding the range. Empirical gunfire noise propagation models and contour maps were developed, which were followed by hypothetical gun noise modeling using Cadna-A. The results indicated compliance with the Nantucket Noise Bylaw and questioned the applicability of Mass DEP Policy 90-001 (310 CMR 7.10). Rebuttals were prepared to refute the opposition’s acoustical experts. The results of the study were presented at the Nantucket Zoning Board of Appeals. Requested by NHA’s lawyers to perform an updated live gunfire noise test focusing on Wigwam Road in preparation for Land Court trial.
  • The Range at Austin, Clayton & Little Architects, Austin, TX (2015) – Performed interior noise calculations and recommended appropriate acoustical treatments for a new gun range in Austin, Texas. Calculated and evaluated wall STC values and room RT60 values for use and comfort of patrons in quieter spaces adjacent to the ranges.
  • L.L.Bean Discovery School Noise Control, L.L.Bean, Freeport, ME (2014) – Performed a noise assessment for a new L.L.Bean Discovery School park area to determine if noise from a nearby 5-stand shotgun field may cause annoyance for patrons at the new park where a quieter background condition is desirable. Ambient noise and shotgun noise levels were measured in the new park area, and shotgun noise emission levels were measured under controlled conditions at the 5-stand area. Future noise levels in the new park area were predicted using the Cadna-A model, and various forms of shotgun noise control were evaluated. It was determined that a large noise barrier built in close proximity to the 5-stand area would be the optimal solution. Developed noise barrier performance specification to seek bids to build noise wall.

  • Lone Pine Gun Range Noise Control, Hollis, NH – Performed acoustical modeling and calculations in support of a proposed indoor gun range in Hollis, NH.  A neighbor was willing to pay for the range’s construction providing the noise level escaping from the range could be limited to 35 dBA at 50 feet.  The Cadna-A noise model was used to evaluate various range wall and roof construction methods and materials in order to sufficiently contain the gun noise.  Interior reverberation time calculations were also performed and absorptive treatments were recommended to reduce interior noise and provide for better speech communication.

  • Crucible Firearms and Training Facility, Team-Crucible Inc., Fredericksburg, VA (2013) - Supported Crucible's efforts to obtain an unconditional use permit for their property to continue to serve as training grounds for advanced private security firearms use, SWAT training, defensive driving techniques and IED usage.  Critically reviewed and critiqued opposing noise study from an encroaching residential development called Westlake.
  • St. Paul Police Department Gun Range, Maplewood, MN - measured noise emissions from a police training gun range during live fire exercises and modeled potential noise abatement measures using the Cadna-A model.  Evaluated results against Minnesota Statue Chapter 87A: Shooting Range Protection with a limit of 63 dBA Leq at residential receptor locations. Was able to demonstrate compliance with Chapter 87A limits, but recommended various firearms noise control options such as noise barriers, shooting shed enclosures, and residential soundproofing for consideration.
  • Waite Park Gun Range, St. Cloud, MN - measured noise emissions during live fire exercises from a private gun range and evaluated results against Minnesota Statue Chapter 87A: Shooting Range Protection with a limit of 63 dBA Leq at residential receptor locations.  Was able to demonstrate compliance with Chapter 87A limits, but recommended various firearms noise control options for future consideration if needed such as noise barriers, shooting shed enclosures, and residential soundproofing.
  • Waterford Gun Range, Waterford, ME– Performed an evaluation of noise generated by an existing range as a potential noise trespass impact at a residence approximately one mile away.  Ambient and gun noise levels were measured and recorded at the residence location.  Current conditions were then simulated in the Cadna-A model in order to develop candidate mitigation options and evaluate their noise reduction effectiveness.  Partial enclosures (shooting sheds) were recommended for the pistol and rifle ranges as well time restrictions for shotgun activities.

  • Headwaters Gun Range, Bemidji, MN – Performed a gun noise evaluation of a proposed combination rifle, pistol and shotgun range in Bemidji, MN.  Firearm noise emission levels were taken from measurements performed on previous projects, and noise levels were predicted at property lines and nearby residential receptors using the Cadna-A environmental noise model.  Noise levels were evaluated against the Minnesota Shooting Range Protection Act and Minnesota Administrative Rule 7030 for compliance.

  • ConnDOC Cheshire Facility Gun Range, Cheshire, CT (2006) – Performed an acoustical analysis and recommended mitigation measures to control gunfire noise emanating from the Connecticut Dept. of Correction’s Maloney Training Center.  Noise measurements were performed inside the range as well as at several residential receptors surrounding the range.  Empirical noise propagation models were developed based on the measurements, and the subjective reaction of the community was evaluated in a series of survey questionnaires.

  • City of Stamford Police Department Gun Range Noise Control, Stamford, CT – Performed a study of the propagation of gunfire noise throughout the building resulting from the use of officers training with handguns, rifles and shotguns in the basement gun range of the Stamford Police Department building.  Gun noise levels were measured to determine loudness and transmissibility through walls and ceilings/floors, and reverberation times were measured inside the range and adjacent ready room.  A comparison of available interior acoustical absorption treatments was conducted, and recommendations were provided to reduce the gun noise both inside the range as well as throughout the rest of the building.  Follow-up noise measurements were performed after the City renovated the range.
  • Moon Island Firearms Range Noise Study, Seaside Alliance, Boston Harbor, MA (1994) - Reviewed and commented on previously performed noise impact regarding the proposed expansion of a Boston Police/DEA firearms training facility.



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