Audio Deterrent Speaker Specs on a Security Trailer — Reach and Coverage

95 dB at 100 feet from the speaker is loud enough to be clearly heard and understood across a typical jobsite perimeter. For context: normal conversation is 60 dB, a vacuum cleaner is 70 dB, a motorcycle is 95 dB.

At 200 feet the perceived output drops to ~89 dB (inverse-square). Still loud enough to be understood on a still night.

• 95 dB @ 100 ft: speaker rating
• 89 dB @ 200 ft: perceived level
• Coverage radius for clear understanding: ~300 ft
• Coverage radius for warning perception: ~500 ft

A single 95 dB horn speaker with 100-degree coverage covers roughly a 300-foot arc in front of it clearly and a 500-foot arc perceivably.

For a 4-acre rectangular site, one speaker aimed at the high-value corner covers the site adequately. Larger or irregular sites use 2 speakers, angled to cover the two most likely intrusion paths.

Speakers on a Houston-deployed trailer face heat, humidity, salt air, and driving rain. Guardtress specs weather-sealed horn speakers with a rated life of 10+ years in Gulf Coast conditions.

Speaker maintenance is part of the quarterly service check. A failed speaker at 2am on a Sunday morning is an avoidable loss driver.

• Sealed horn speakers, IP66 rated
• Rated life 10+ yr Gulf Coast
• Quarterly service check
• Redundant speaker on high-value deployments

The speaker is only as good as the operator behind it. Guardtress speakers integrate with monitoring center consoles for single-keystroke live talkdown with real-time voice.

Recorded loops are also available as a Tier 0 fallback, but live voice is the stronger deterrent — intruders test loops and learn to ignore them.

Standard Guardtress deployments across the Houston metro land in 24–72 hours from signed quote to live monitoring. A single solar-powered mobile security trailer covers roughly 1.5–2 acres of open ground, carries 5–7 days of no-sun autonomy, and runs on bonded cellular so it needs no site power, no trenching, and no permanent mounting. Units relocate with a standard pintle hitch as the work front moves — a real advantage on phased Houston builds where the exposure point changes every few weeks.

Every unit ships with license plate recognition (LPR), analytic tripwires tuned to human and vehicle shapes, and two-way talkdown from a live U.S.-based monitoring center. Verified events escalate to the Houston Police Department or the Harris County Sheriff's Office as a confirmed crime in progress, which moves the call up the priority queue instead of into the false-alarm pile. Site plans, camera angles, and escalation contacts are set during a 30-minute assessment before the trailer leaves the yard.

• Assessment to live monitoring: 24–72 hours
• Coverage per unit: 1.5–2 acres, 360° with LPR at entry
• Power: solar with 5–7 days no-sun autonomy, no site power required
• Escalation: verified talkdown, then HPD / Harris County Sheriff dispatch
• Service area: Houston, Sugar Land, The Woodlands, Pasadena, Baytown, Conroe, Katy, Galveston, League City, Pearland

Houston contract guards run roughly $28–$42 per hour loaded, so a single unarmed guard on a 12-hour night shift costs about $10,000–$15,000 per month — for one set of eyes that can only be in one place, takes breaks, and turns over often. A monitored Guardtress trailer covers the same perimeter continuously at a fraction of that, and the spend moves from a headcount line to a predictable OPEX line you can hold to the schedule.

The math usually turns on two numbers: what a single loss event costs you in materials plus schedule slip, and whether your carrier offers any credit for a written 24/7 monitoring plan — a question worth asking your broker directly. Full site-by-site pricing is in our construction site security cost guide, and the head-to-head breakdown is at Guardtress vs. security guards.

• Houston guard rate: $28–$42/hour loaded
• One 12-hour guard shift: $10,000–$15,000/month
• Monitored trailer: fixed monthly OPEX, no overtime or turnover
• Builder's risk documentation: written monitoring plan formatted for broker review