Introduction:

The art and science of wireless microphone design have progressed in recent years to a point where reliable and flexible performance can be taken for granted in even the most complex venues. What remains is for this level of performance to become available at competitive prices and with easier setup requirements. AKG’s new WMS 61 and 81 wireless systems go a long way toward achieving these goals.

The AKG WMS61 and 81 systems embody a number of technical attributes contributing to improved performance including the following: long battery life (up to 12 hours for non-rechargeable batteries), automatic squelching via a pilot tone imbedded in the transmitter signal, complementary 2-to-1 companding circuits, diversity reception, remote monitoring of battery power, and overall ease of setup.

The WMS61 system operates in the VHF band, while the WMS 81 operates in the UHF band; otherwise, the two systems are virtually identical in execution and performance. The available frequency sets for the WMS 61 correspond to TV channels 7, 8, 9, 10, 11, 12 and 13. The available frequency sets for the WMS 81 correspond to TV channels 54, 55, 58 and 59. There are 15 adjustable frequency bands within each set. (See Ordering Information for added details on each frequency set and regional requirements.)

In this White Paper we will discuss performance and operational aspects of these new systems, complete with hands-on descriptions and system walk-through.

A Review of Technical Fundamentals:

Essentially, the heart of any wireless microphone is a miniature, low power FM (frequency modulation) transmitter. In fact, some of the earliest wireless microphones operated on the commercial FM broadcast band and could be picked up with a standard FM tuner! You can imagine the difficulties this caused in major cities where FM frequency broadcasting allocations were plentiful and where the use of such microphones could interfere with nearby FM receivers.

Figure 1 shows the basic flow diagram for an FM modulation/demodulation system. Here, a RF (radio frequency) carrier is generated, frequency-modulated by an audio signal, and then propagated through space. At the receiving end the carrier is picked up, amplified, limited in amplitude to remove any effects of atmospheric electrical interference, and finally demodulated to recover the audio signal.

Figure 1. Basic principles of FM transmission and reception

 

 

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AKG Acoustics WMS81, WMS61 manual Introduction, Review of Technical Fundamentals
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WMS61, WMS81 specifications

AKG Acoustics has been a leading name in professional audio equipment for decades, renowned for its innovative designs and superior sound quality. The WMS81 and WMS61 are two notable products in their wireless microphone systems, designed to meet the demanding needs of live performances, presentations, and broadcasting. Both systems offer exceptional performance, ease of use, and advanced technology, making them ideal choices for musicians, public speakers, and audio professionals.

The AKG WMS81 is notable for its precision and reliability. One of its main features is its advanced frequency management technology, which ensures a stable connection by automatically scanning for the clearest frequencies. This minimizes the risk of interference during live performances. The WMS81 also includes a high-quality handheld transmitter with an AKG D5 microphone capsule, known for its excellent feedback rejection and vocal clarity. This makes it particularly suitable for dynamic performances where clarity and volume are essential. Additionally, the WMS81 offers a wide frequency response, ensuring that every nuance of the performance is captured.

On the other hand, the AKG WMS61 is a versatile system that provides excellent sound quality and flexibility. It features a compact bodypack transmitter designed for use with lavalier or headworn microphones, providing hands-free operation that is perfect for presentations or theater performances. The WMS61 includes a diverse selection of frequency channels, enabling users to operate multiple systems simultaneously without interference. Its sturdy construction ensures durability, which is essential for the rigors of touring and frequent use.

Both systems utilize AKG's renowned audio technologies, including their high-frequency response and low distortion characteristics. Another key feature of these systems is the automatic frequency selection capability, allowing users to easily find the best available channel in crowded RF environments. They also both come equipped with an efficient battery management system, offering extended operational time to ensure reliability during long events.

In summary, the AKG WMS81 and WMS61 wireless microphone systems are excellent choices for anyone looking for high-quality audio performance in a wireless format. Their robust features, advanced technologies, and user-friendly designs make them suitable for a wide range of applications, from live performances to corporate events. With AKG's commitment to innovation and quality, both systems promise to deliver exceptional sound and reliability for audio professionals and enthusiasts alike.
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