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?
The TrueWave Pro AIR series gives you two answers: the two-channel AIR-B2 and the four-channel AIR-B4. Both are RCM certified, rechargeable and supported locally in Australia. 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, USB-C powered receiver. $247.99
- Need up to 4 microphones? → TrueWave Pro AIR-B4 — 4-channel, four rechargeable handhelds, 1U rackmount, Auto Scan. $495.99
Both are true-diversity UHF systems with rechargeable lithium microphones, individual balanced XLR outputs and IR sync.
What both systems have in common
- RCM certified for Australia. Tested to AS/NZS 4268 and operating below 694 MHz, inside the band set aside for wireless microphones here.
- Rechargeable microphones. Each handheld uses a removable 18650 rechargeable lithium cell (about 10 hours per charge), with magnetic charging cables in the box. No disposable batteries.
- True Diversity reception. Two antennas per channel constantly pick the stronger signal, which means fewer dropouts on stage and across a room.
- IR sync. Point a microphone at the receiver and it pairs in seconds — no manual channel matching.
- Clean, flexible outputs. A balanced XLR output for every channel plus a 6.35 mm mixed output to feed a single input.
- Local warranty and spares. 12-month warranty handled in Australia, with spare handhelds, bodypacks and charging docks sold separately.
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 |
| Auto Scan | No (manual channel selection) | Yes |
| RF frequency range | 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 (5 V) | 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 |
| Certification | RCM, CE | RCM, CE |
| Best for | Presenters, worship, classrooms, small–mid events, portable use | 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.
- 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 receiver drops straight in, and Auto Scan finds clear frequencies for you. Portable or outdoor? The AIR-B2's compact receiver runs from USB-C, including a laptop or power bank.
- Handhelds vs lapel/headset. Both ship with handheld mics. For hands-free use, add the AIR-BX-B1 bodypack, which includes a lapel and a headset mic and pairs with either system.
Frequently asked questions
Are these legal to use in Australia?
Yes. Both systems are RCM certified and operate below 694 MHz, in the Australian wireless microphone band. Television shares the band, so choose channels that are clear at your venue.
Do I still need batteries?
No disposables. Each microphone uses a removable rechargeable lithium cell and comes with a magnetic charging cable. Keep a spare cell charged for back-to-back events, or add an AIR-BX charging dock.
How many systems can I run in the same room?
Each channel has 100 selectable frequencies, so several systems can run together on different frequencies. The AIR-B4's Auto Scan makes this easier. For 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 buy a spare microphone?
Yes — the AIR-BX-H1 handheld pairs with both the AIR-B2 and AIR-B4.
Ready to buy?
- 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, with free standard shipping on Australian orders of $100 or more.
Prices in AUD including GST at the time of writing — see product pages for current pricing.
