Choosing a UHF wireless microphone system for your church, school, conference room or events business comes down to two questions: how many microphones do you need at once, and how reliable is the system in the real world?
If you've been looking at the older Phenyx PTU-71, PTU-52, PTU-7000 or PTU-5200, here's the situation: MSM AV is no longer a Phenyx Pro dealer, so we can't supply, warranty or service those systems in Australia any more. What we stock in their place is the TrueWave Pro AIR series — newer, rechargeable, and backed locally. This guide shows you exactly which one to buy.
The quick answer
- Need up to 2 microphones? → TrueWave Pro AIR-B2 — 2-channel, two rechargeable handhelds. $247.99
- Need up to 4 microphones? → TrueWave Pro AIR-B4 — 4-channel, four rechargeable handhelds, 1U rackmount. $495.99
Both are true-diversity UHF systems with rechargeable lithium microphones, dual/quad balanced XLR outputs, auto-scan and IR sync — and both are stocked in Australia with fast, free shipping.
Which Phenyx model does each AIR system replace?
| If you were buying… | Channels | Our replacement |
|---|---|---|
| Phenyx PTU-71 (dual UHF) | 2 mics | AIR-B2 |
| Phenyx PTU-52 (dual, frequency hopping) | 2 mics | AIR-B2 |
| Phenyx PTU-7000 (quad UHF) | 4 mics | AIR-B4 |
| Phenyx PTU-5200 (quad, frequency hopping) | 4 mics | AIR-B4 |
The rule of thumb is simple: two-channel Phenyx systems → AIR-B2; four-channel Phenyx systems → AIR-B4.
Why we recommend the AIR series
The AIR-B2 and AIR-B4 aren't just "in stock" alternatives — on the points below they measurably improve on the older PTU systems:
- Rechargeable microphones, no more disposable batteries. Each handheld uses a removable 18650 rechargeable lithium cell (about 10 hours per charge) with magnetic charging cables in the box. The PTU-71 and PTU-52 handhelds run on disposable AA batteries — the AIR series pays that cost back over time.
- True Diversity reception. Two antennas per channel constantly pick the stronger signal, which means fewer dropouts on stage and across a room.
- Fast, foolproof setup. Auto Scan finds a clean frequency and IR sync pairs each mic to the receiver in seconds — no fiddly manual channel matching.
- Clean, flexible outputs. Balanced XLR out for every channel (2 on the AIR-B2, 4 on the AIR-B4) plus a 6.35 mm mixed output to feed a single input.
- Modern power. The AIR-B2 receiver runs on convenient USB-C; the AIR-B4 is a 1U rackmount on 12 V for permanent installs.
- Stocked, warranted and supported in Australia. Both ship fast and free AU-wide from MSM AV, with local warranty and local returns — not a grey import you have to send overseas if something goes wrong.
AIR-B2 vs AIR-B4: side by side
| AIR-B2 | AIR-B4 | |
|---|---|---|
| Channels | 2 (2 × 100 selectable) | 4 (4 × 100 selectable) |
| Handheld mics included | 2 rechargeable | 4 rechargeable |
| Reception | True Diversity | True Diversity |
| RF carrier frequency | 650.1 – 693.3 MHz | 606.3 – 693.3 MHz |
| Audio outputs | 2 × XLR + 1 × 6.35 mm mixed | 4 × XLR + 1 × 6.35 mm mixed |
| Receiver format | Compact, USB-C powered | 1U rackmount, 12 V |
| Range | Up to 100 m (≈330 ft) line-of-sight | Up to 100 m (≈330 ft) line-of-sight |
| Battery life | ≈10 hours per charge | ≈10 hours per charge |
| Latency | < 2.9 ms | < 2.9 ms |
| Best for | Presenters, worship, classrooms, small–mid events | Larger productions, multi-presenter, houses of worship, rackmount installs |
| Price | $247.99 | $495.99 |
How to choose the right one
- Counting your microphones is the main decision. If you'll never need more than two live mics at once (a presenter + a Q&A mic, a vocalist + a guest), the AIR-B2 is all you need. If you run panels, worship teams or multi-speaker events, step up to the AIR-B4 so you have four independent channels.
- Think about growth. If you're close to needing three mics, the AIR-B4 gives you headroom without buying a second system later.
- Consider the install. Fixed rack? The AIR-B4's 1U rackmount receiver drops straight in. Portable or desktop setup? The AIR-B2's compact USB-C receiver is easy to move and power from a laptop brick or power bank.
- Handhelds vs lapel/headset. Both ship with handheld mics; if you need lapel or headset mics, ask us about bodypack options to pair with your system.
Frequently asked questions
Are the Phenyx PTU-71, PTU-52, PTU-7000 and PTU-5200 discontinued? Not by Phenyx — they are still listed by the manufacturer overseas. What has changed is that MSM AV is no longer a Phenyx Pro dealer, so we can't supply them, and we can't warranty or service them here. A unit bought from an overseas seller comes with no Australian warranty and no local support, and a fault means shipping it back overseas at your cost. Our replacement is the AIR series, stocked and supported in Australia.
Will these work in Australia? Yes — both are UHF systems stocked and sold in Australia by MSM AV, and ship free AU-wide.
Do I still need batteries? No disposables. Each microphone uses a removable rechargeable lithium cell and comes with magnetic charging cables. Keep a spare cell charged for back-to-back events.
How many systems can I run in the same room? Each system gives you multiple selectable channels (2 × 100 on the AIR-B2, 4 × 100 on the AIR-B4), and Auto Scan helps them find clear, non-clashing frequencies. For very large multi-system setups, get in touch and we'll help you plan channels.
What do I plug them into? Any mixer, powered speaker or interface with XLR or 6.35 mm (1/4") inputs. Use the individual XLR outputs for full control, or the single mixed output to feed one channel.
Can I get lapel or headset mics? The kits include handheld mics. Talk to us about adding bodypack transmitters with lapel or headset mics for presenters and worship use.
Ready to upgrade?
- Shop the TrueWave Pro AIR-B2 → — best for up to 2 microphones ($247.99)
- Shop the TrueWave Pro AIR-B4 → — best for up to 4 microphones ($495.99)
Not sure which fits your venue? Contact the MSM AV team and we'll help you pick the right system. Stocked in Australia. Fast, free AU-wide shipping.
Phenyx Pro and PTU are trademarks of Phenyx Technology LLC. MSM AV Pty Ltd is not affiliated with, or an authorised dealer for, Phenyx Pro. Phenyx product details quoted here are as published by the manufacturer, August 2026, and may change.
