Revel C563 6 ½" In-Ceiling Loudspeaker Speaker Colour:Black Input Sensitivity: 870 mV (Stereo)

Input Sensitivity: 870 mV (Stereo)

Input Sensitivity: 620 mV

This puts the LUMIN Amp among very few amps in which input impedance allows such a purist partnering

During the review they state:

Revel C563 6 ½" In-Ceiling Loudspeaker Speaker Colour:Black Input Sensitivity: 870 mV (Stereo)C563 6 " In Ceiling Loudspeaker Revel in ceiling loudspeakers draw upon the same research, resources, and unique perspectives that put all our loudspeakers in a class by themselves. Each model offers a standard setting low sonic coloration and freedom from distortion over a wide dynamic range. C563 Highlights Long throw woofers with cast frames and rubber surrounds provide high output with low distortion 1 inch (25mm) angle adjustable, metal dome