Gear article
SubZero SZW-20 Handheld Wireless Microphone System
The SubZero SZW-20 is an entry-level single handheld wireless microphone system designed for live vocal applications. Operating on the UHF frequency band, it provides a functional range of up to 50 metres and is marketed as a complete, 'plug-and-play' solution for various performance environments.

Overview
The SubZero SZW-20 is positioned as a budget-friendly wireless solution for vocalists, public speakers, and event organisers. The package is a comprehensive kit, consisting of a handheld wireless microphone and a dedicated desktop receiver. Designed for immediate utility, the manufacturer includes the necessary power supply, batteries, and a 6.35mm jack cable, allowing the system to be integrated into a PA system without additional purchases.
Design and Functionality
The system utilises Ultra High Frequency (UHF) transmission, which is intended to offer superior sound quality and higher reliability compared to basic VHF systems. The receiver is a desktop-style unit that interfaces with mixing consoles or powered speakers via a standard unbalanced jack connection. The handheld transmitter serves as the microphone and contains the internal wireless electronics, powered by standard batteries.

Operational Range and Reliability
A key feature of the SZW-20 is its 50-metre operational range. This distance provides significant freedom of movement for performers in small to medium-sized venues, such as lecture halls, community centres, or small music stages. The UHF design is specifically chosen to mitigate interference, ensuring a stable signal during live use.
Target Audience
Given its price point and 'plug-and-play' nature, the SZW-20 is primarily suited for those requiring a basic wireless setup for occasional use. It is a popular choice for budget-conscious schools, small houses of worship, and karaoke enthusiasts. While it provides the convenience of wireless operation, professionals requiring high-end tour-grade durability may look towards established industry standards like the Shure SM58 or Sennheiser e935.
Market Position and Comparisons
At approximately £35, the SZW-20 occupies the entry-level tier of the market. While it lacks the advanced features of systems from Shure or Sennheiser, it offers a functional wireless experience at a fraction of the cost. For users who prioritise the iconic sound profile of a dynamic mic, the wired Shure SM58 or SM57 remain competitors, though they do not offer the wireless freedom inherent to the SubZero system.
Related gear
£559.00 ($710)Electro-Voice
Electro-Voice RE20 Dynamic Cardioid Microphone
£168.70 ($214)Sennheiser
Sennheiser e935 Dynamic Vocal Microphone
£135.25 ($172)Shure
Shure 520DX Green Bullet Harmonica Microphone
£161.00 ($204)Shure
Shure Beta 58A Dynamic Microphone
£259.00 ($329)Shure
Shure SM58 Dynamic Cardioid Vocal Microphone
£167.55 ($213)Sennheiser
Sennheiser e945 Dynamic Vocal Microphone
£103.75 ($132)Shure
Shure SM57 Dynamic Instrument Microphone
£1,080.00 ($1,372)Sennheiser
Sennheiser MD 441-U Dynamic Supercardioid Microphone
Frequently asked questions
- What is included in the SubZero SZW-20 box?
- The system includes one handheld wireless microphone, a desktop receiver, a power supply for the receiver, batteries for the microphone, and a 6.35mm jack cable. It is a complete kit designed to be used straight out of the box.
- What is the maximum wireless range of the SZW-20?
- The system has a manufacturer-specified range of up to 50 metres. This range is suitable for most small to medium-sized rooms and outdoor settings, though physical obstructions may impact performance.
- Does this system use VHF or UHF frequencies?
- The SubZero SZW-20 uses UHF (Ultra High Frequency) design. UHF is generally preferred over VHF for wireless microphones because it offers better sound quality and is less prone to interference from other electronic devices.
- How do I connect the SZW-20 to a PA system?
- The system is connected by plugging the included jack cable from the desktop receiver into a microphone or line input on a PA system or mixer. The receiver must also be connected to a mains power source using the provided adapter.
- What power source does the handheld microphone require?
- The handheld microphone is battery-powered. A set of batteries is typically included in the box to allow for immediate operation upon purchase.
- Is the SubZero SZW-20 suitable for professional touring?
- While the SZW-20 is reliable for entry-level use, it is designed as a budget-friendly solution rather than a tour-grade system. For rigorous professional touring, systems with metal chassis and switchable frequencies, like higher-end Shure or Sennheiser models, are more common.
- Can I use multiple SZW-20 systems at the same time?
- This specific single-channel model is designed for a single microphone use. Using multiple units simultaneously may require checking for frequency compatibility to avoid signal interference between the sets.
- What type of connection cable is provided with the system?
- The system is supplied with a standard 6.35mm (1/4 inch) jack cable. This is the typical connection format for most entry-level mixers and portable PA units.
- Is the SZW-20 microphone dynamic or condenser?
- The SZW-20 uses a wireless handheld transmitter that functions similarly to a dynamic vocal microphone. It is intended for live vocal applications such as singing and speech.
- Does the receiver require a power outlet?
- Yes, the desktop receiver must be plugged into a standard mains power outlet. A power supply is included in the package for this purpose.
- How does the sound quality compare to a Shure SM58?
- The Shure SM58 is a professional industry-standard wired microphone known for its specific warmth and durability. The SZW-20 offers the convenience of wireless operation at a much lower price point, though it may not match the frequency response or ruggedness of the SM58.
- What is the primary benefit of the 'plug-and-play' design?
- The 'plug-and-play' design means the system requires minimal setup and no complex frequency synchronisation. This makes it ideal for users who are not technically inclined or who need a quick setup for events.
