Raising the input power from 1 watt to 2 watts is a 3 dB increase over the 1 watt reference case, so 97 + 3 = 100 dB SPL. Let's say the max power handling is 300 watts. Power your passive speakers, create your dream smart home, and enjoy endless possibilities for multiroom listening. Amp packs 125 watts per channel, so you can easily power outdoor speakers and listen at higher volumes with clear, undistorted sound. Connect everything from your passive speakers and. The Sonos Amp is an Streaming Integrated Amplifier by Sonos that delivers 125 watts x 2 channels into 8 ohms. Minimum impedance of 4 ohms makes the Sonos Amp compatible with a wide range of loudspeakers. In-line amplifiers: Periodically amplify signal due to fiber attenuation, high G, high Psat.