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 Durably constructed, with 12 compatible systems (multiple bands) and included carrying case, PGX Performance Gear is the perfect system for performers on the go who want worry-free performance, every time. PGX Performance Gear Wireless Systems feature Shure's patented Audio Reference Companding for crystal-clear sound beyond the limits of conventional wireless technology. Also includes case to transport and store safely!Shure PGX4 Diversity Receiver Features: Shure PGX1 Wireless Transmitter Features:  PGX Series Wireless Features Patented Audio Reference Companding!Shure's patented Audio Reference Companding is currently featured in PGX Performance Gear, SLX, and ULX Wireless Systems, and in some PSM 700 Personal Monitor Systems (H3 and L2 bands). Audio Reference Companding: The Basics What does it do? Improves wireless sound quality. What is it? A more efficient companding scheme. What is companding? Companding is the process of compressing the audio signal prior to transmission and expanding it after reception. All pro audio wireless needs companding to deliver a wide dynamic range (greater than 100dB). How does it work? Audio Reference Companding is a level-dependent companding scheme. Instead of companding across the entire dynamic range like most wireless systems (causing a whooshing audio artifact known as "breathing"), companding only occurs at high audio levels. These levels are high enough to make the companding artifacts inaudible. Why is it better? Sounds more like a wired microphone, with less noise and greater dynamic range than other wireless systems. No artifacts, lower noise floor, clearer sound at all audio levels. Audio Reference Companding: Tangible results Specific attributes of Audio Reference Companding that the listener will notice are: 
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