# CSTI Acoustics

> CSTI Acoustics (Collaboration in Science and Technology, Inc.) is a board-certified acoustical-engineering consultancy in Houston, Texas, founded in 1990. It provides industrial noise control, architectural acoustics, and acoustical expert-witness / litigation support across the Gulf Coast and nationwide.

CSTI is a boutique firm — the same INCE Board Certified engineer who scopes a problem measures it, models it, and signs the report. Led by principal and owner Arno S. Bommer (board-certified, practicing since 1982). Founded by Robert D. "Bob" Bruce, P.E., a Fellow of the Acoustical Society of America and past president of INCE/USA. Member of the National Council of Acoustical Consultants (NCAC).

Contact: (281) 492-2784 · info@cstiacoustics.com · 16155 Park Row, Suite 150, Houston, TX 77084.

## Services

- [Industrial & Energy Noise Control](https://cstiacoustics.com/industrial.html): OSHA 29 CFR 1910.95 noise surveys and dosimetry, hearing conservation programs, equipment noise control (enclosures, silencers, barriers), and property-line / community noise modeling (ISO 9613-2) for refineries, petrochemical plants, LNG, compressor stations, and power generation.
- [Architectural & Community Acoustics](https://cstiacoustics.com/architectural.html): sound isolation and STC/IIC design and field testing (ASTM E90/E336), room acoustics and reverberation (RT60, ISO 3382), mechanical/HVAC noise, sound masking and speech privacy, LEED and WELL acoustic compliance, and community/environmental noise studies.
- [Litigation Support & Expert Witness](https://cstiacoustics.com/litigation.html): board-certified acoustical expert-witness testimony and forensic acoustical analysis for noise disputes, nuisance and ordinance cases, and workplace exposure claims — measurements to ANSI S1.4/S1.13, retained by both plaintiff and defense.

## Free tools (acoustics calculators)

- [OSHA Noise Dose & 8-Hour TWA Calculator](https://cstiacoustics.com/tools/osha-noise-dose.html): noise dose and time-weighted average per 29 CFR 1910.95, with a NIOSH mode.
- [Sound-Level Distance Attenuation Calculator](https://cstiacoustics.com/tools/distance-attenuation.html): predicts sound-level drop with distance (ISO 9613-2; 6 dB per doubling for point sources).
- [Decibel (Logarithmic) Addition Calculator](https://cstiacoustics.com/tools/decibel-addition.html): correctly combines sound levels (10 dB + 10 dB = 13 dB, not 20).
- [Reverberation Time (RT60) Calculator](https://cstiacoustics.com/tools/rt60-calculator.html): room reverberation using the Sabine equation.
- [Ldn / CNEL Community Noise Calculator](https://cstiacoustics.com/tools/ldn-cnel-calculator.html): day-night average sound level with the nighttime penalty, vs. HUD/ordinance thresholds.
- [STC / NRC Material Selector & Composite-Wall Calculator](https://cstiacoustics.com/tools/stc-nrc-selector.html): sound-isolation and absorption values, plus composite STC for walls with doors/windows.

## More

- [Projects / Case Studies](https://cstiacoustics.com/case-studies.html): representative work with measurable outcomes (dB reductions, OSHA compliance, ordinance results).
- [About](https://cstiacoustics.com/about.html): the people and credentials behind the firm.
- [Contact](https://cstiacoustics.com/contact.html): request a site noise assessment, design-phase consultation, or expert-witness engagement.