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The wireless receiver measures 5 x 3.5 x 2 inches only and easily mounts to a speaker. Application Model 1550: Passive Speakers 5.8 GHz Digital • Two wireless mono amplifiers with 50-Watts peak output power per channel • No audio compression • Only 0.05 % total harmonic distortion • Amplifiers connect directly to loudspeakers Actual size of wireless amplifier Technical Specifications Transmitters / Receivers / Amplifiers Transmitter Model 1500 Model 1520 Model 1550 Audio transmissio