Thanks for the reply. Everything is sounding very good with the optical output. No clicks. I’m really liking this player.All SPDIF outputs, from any CD player, are DIGITAL, have no volume, have no voltage, and are not linked to the volume control. The PL150's RCA output is linked to the volume; its voltage, as far as I'm concerned, is the same (1dB less?) as that of the other player and the DAC output. The RCA output has an annoying click (like an electrical discharge) at the beginning of each track, but the coaxial output doesn't!!!