AKG WMS40 Mini2 Dual Wireless Handheld and Bodypack Set US25 B and D

AKG MINI2MIX-US25BD: Two Wireless Channels, Two Different Jobs

The AKG WMS40 Mini2 Dual Vocal Instrumental Set is an analog UHF dual-channel wireless system that pairs one HT40 Mini handheld transmitter with one PT40 Mini bodypack transmitter on a single SR40 Mini2 receiver. This version operates on band US25 B at 537.900 MHz and band US25 D at 540.400 MHz, two fixed carriers rather than a tunable range. Audio specifications are 40 Hz to 20,000 Hz bandwidth, 0.8 percent total harmonic distortion at 1 kHz, a 105 dB-A signal-to-noise ratio and 10 mW maximum RF output, with an operating range of 65.6 ft (20 m). It is the set to order when a room needs one microphone in a hand and one on a body.

Why the Mix Configuration Exists

Set configuration in this range is defined entirely by which transmitters are in the box, and the mix set is the only one that supplies both types. A vocal set ships two handheld transmitters, an instrumental set ships two bodypacks with instrument cables, and this set ships one of each, which means it covers the two most common wireless requirements in a small venue simultaneously rather than forcing a choice. A solo singer-guitarist is the archetype, taking the handheld for voice and running the bodypack from a guitar, but the same box serves a worship team wanting a lead vocal plus an acoustic instrument, or a fitness studio pairing an instructor headset on the bodypack with a handheld for guest speakers. Buying two single-channel systems to achieve the same coverage costs more rack space, two power supplies and two sets of frequencies to keep track of.

Fixed Frequencies and What That Means in Practice

Both channels run on fixed carriers, 537.900 MHz for the band B channel and 540.400 MHz for the band D channel, and this is a design choice rather than an omission. A fixed-frequency system has no scanning, no pairing sequence, no menu structure and no possibility of a transmitter and receiver drifting out of agreement, which means anyone can set it up correctly and nobody can misconfigure it, and that reliability is the whole point in a school hall, a community centre or a hotel banquet room without a technician on staff. The consequence is that the frequencies cannot be moved if something else in the building is already using them, so the band letters should be checked against any other wireless already operating in the venue before deploying. Choosing the other available pairing in the range is how a second system is added to the same room.

The SR40 Mini2 Receiver and Its Outputs

Receiving duties fall to a compact tabletop SR40 Mini2 with two fixed external antennas and two independent channels. Each channel presents its own balanced 1/4 in (6.3 mm) TRS jack output with its own volume control, which means the two performers can be level-matched at the receiver before either signal ever reaches a mixer, and that is genuinely useful when a guitar pickup and a vocal microphone arrive at wildly different levels. The design is non-diversity, meaning each channel uses a single antenna path rather than switching between two, which keeps the receiver small and simple at the cost of the dropout immunity a true diversity receiver provides over longer distances. Within the specified 65.6 ft (20 m) range and with a clear sightline that trade is rarely noticed, and outside it a larger system is the right answer.

Transmitters, Inputs and Battery Life

Battery endurance is the specification this range is best known for, with each transmitter running more than thirty hours from one 1.5 V AA size battery. Thirty hours from a single alkaline cell is roughly a week of evening services or a month of weekly rehearsals, which changes how a venue manages consumables from a per-show ritual to an occasional task. The HT40 Mini handheld carries a dynamic cardioid element behind a wire-mesh grille, the classic combination for a loud stage because a dynamic capsule tolerates high pressure and a cardioid pattern rejects the monitors behind it. The PT40 Mini bodypack accepts a 3-pin locking mini connector taking guitar and bass level signals, headset microphones and instrument microphones, and ships with an MKG L instrument cable and a BC400 belt clip.

Contents, Power and Where It Belongs

Everything needed to run arrives together: the receiver, both transmitters, the MKG L instrument cable, a microphone stand adapter, two AA batteries and a universal switched-mode power supply carrying North American, UK and European mains connectors. A switched-mode supply with interchangeable connectors matters for anything that travels, since the same unit works on any mains voltage without a transformer, and the two supplied batteries mean the system runs out of the box rather than after a shop trip. Small clubs, hotel and banquet rooms, school and community theatre, worship spaces, fitness studios and mobile event rigs are where this configuration fits, all of them places where setup time is short and no technician is assigned. Larger venues and any installation needing more than two channels, longer range or frequency agility should specify a coordinated multi-channel system instead.