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G, I noticed that you mentioned that you didn't use your own phono preamp. Maybe you didn't use the phono preamp because your headphone amp has enough gain without the phono preamp? And then you put the phono preamp back in when you listened to the speakers? I'm just guessing, because that would explain why you hear more noise in headphones... It is absolutely necessary to use a phono preamp when listening to vinyl whether on headphones or speakers, because in addition to providing voltage gain, all phono preamps also apply RIAA equalization to achieve flat frequency response. All vinyl is mastered with RIAA curve, which de-emphasizes the bass and emphasizes the treble in an effort to reduce noise when played back through a phono preamp filter which restores the flat freq response during playback. This is the same principle used by Dolby to reduce tape hiss. The amplitude of the vinyl equalization is enormous, a 40dB difference from 20Hz to 20kHz. https://en.wikipedia.org/wiki/RIAA_equalizationListening to vinyl without the RIAA correction filter of a phono pre would leave the highs way too hot, and that's where most of the surface noise lives. Just a wild guess....