HT-Air MKII continues REL’s relentless drive to deliver the highest performance, the finest craftsmanship, and the easiest to use subwoofers available. With HT-Air MKII, we’ve outdone ourselves. Within seconds of plugging in the transmitter and receiver, you’ll be ready to start transmitting music or film audio at 5.8 gigs, completely free of digital compression, for the widest dynamics and best sound. HT-Air MKII delivers the highest performance for Low Level (RCA-RCA) or LFE/.1 (single RCA) transmissions.