05
Dec
2025

Reliable Wireless Audio for School Pools: MIPRO ACT-33TW and ACT-58TW

School pools present unique challenges for audio systems. Between echoing acoustics, constant moisture, and the need for clear communication during lessons and events, reliable wireless audio is essential. That’s where MIPRO’s ACT-33TW and ACT-58TW transmitters come in—built to perform where water and clarity meet.

Built for Demanding Environments

The ACT-33TW is a UHF analog bodypack transmitter with IP67-rated waterproof and dustproof housing, ready for poolside use. Powered by standard AA batteries and compatible with waterproof microphones, it ensures reliable communication for daily lessons, lifeguard instructions, or swim events.

For schools seeking digital performance, the ACT-58TW operates in the 5 GHz digital band, also with IP67 protection, and delivers ultra-low latency (<1.5 ms)—perfect for synchronized cues in high-motion or instructional contexts. Its broader bandwidth and digital design offer flexibility for future AV upgrades.

Quick Comparison

Feature MIPRO ACT‑33TW (Analog UHF) MIPRO ACT‑58TW (Digital 5 GHz)
Frequency band UHF (approx. 480–934 MHz)  ISM 5.8 GHz digital band 
Waterproof / dust rating IP67 – good for pool‑side, humid or splash‑prone environments IP67 – same strong protection for wet/humid areas 
Latency Analog – standard latency Ultra-low latency: less than 1.5 ms 
Bandwidth / signal headroom 24 MHz bandwidth (analog) 125 MHz bandwidth (digital) 
Power & battery 2× AA batteries, RF output approx. 10 mW (depends on region)  2× AA batteries, RF output approx. 20 mW (depends on region)
Best for… Reliable, simpler setup in analog pool‑side applications More advanced setup needing low‑latency, digital signal and future scalability


Connect to External Speakers for Pool Classes

Both the ACT-33TW and ACT-58TW can be paired with a compatible MIPRO receiver, which then outputs to external speakers or PA systems, making them ideal for a variety of poolside applications. Whether it’s swimming lessons, poolside classes, or events and swim meets, instructors, coaches, and lifeguards can communicate instantly and clearly, ensuring safety and effective instruction for all students.

The system works by wirelessly transmitting audio from the bodypack transmitter to the paired receiver, which can then feed powered speakers or an amplifier driving passive speakers. This ensures that instructions, coaching cues, and safety announcements reach everyone—even in large, echo-prone, or noisy pool environments—without compromising clarity or reliability.

Why This Matters for Schools

  • Safety & clarity: Lifeguards, coaches, and instructors can communicate instantly, keeping students safe and lessons on track.
  • Durability: Both models resist water, humidity, and daily wear, making them ideal for poolside use.
  • Ease of use: Quick battery swaps and ergonomic clips simplify deployment for busy schedules.
  • Scalability: Choose analog simplicity (ACT‑33TW) or digital flexibility (ACT‑58TW) depending on current and future AV needs. 

Whether it’s a swimming carnival, a staff briefing, or a daily lesson, clear and reliable audio is essential. With MIPRO’s waterproof transmitters, schools can ensure communication is consistent, safe, and effective—poolside, every time.

Want dependable wireless microphones that stand up to challenging environments? Contact D.I.B Audio Visual at 03 9457 4800 or via info@dibaustralia.com.au and we’ll help you choose between analog (ACT‑33TW) or digital (ACT‑58TW) options.