For the last year or so I've always just switched the pre-amp/amp (or integrated amp more recently) to standby and left the Spring on. No problems so far.

Thanks, it arrived today but the room is out of action for painting at the moment so I won't get things warmed up and ready for a good listen for a week or two. I ordered it at 0.5m, a bit longer than I need, as the picture on the website looked like the cable may be somewhat stiff.

Has been on repeat for last couple of weeks (busy with work and kids). Setup is PC (Roon) > NAS > fibre optic isolators > Aries femto (SBooster/Ultra LPS) > Curious USB > Intona Industrial > Curious USB > Matrix X-SPDIF 2 (Uptone LPS-1) > Apollo AV Lightning 2 I2S > Holo Spring DAC (L2) >...

Along with the Matrix X-SPDIF 2 which is similar price and already has a DC input that you can plug an Uptone LPS-1 (or PS of your choice) into without any mods/kits required.

WooHoo! Guess who has a Matrix X-SPDIF 2 and Uptone LPS-1 on the way ... it will feed my Holo Spring L2 DAC via ApolloAV HDMI cable.

Do you mean that the SU-1 beat the X-SPDIF2 hands down, or the MC-1.2 hands down?

I've also seen several people on various forums say they preferred the I2S input from the SU-1 over the USB input. In most cases the difference was described as small (though significant) and in most cases (but not all) they weren't using any "cleaning" on the USB path (eg. Regen, Intona etc)...

Thanks HF12. Enjoyed your impressions. Interesting point on the tubes with Grados. I've just bought the Ms Pros off eBay and don't have anything to drive them with. Unfortunately don't have time or anywhere local to hear good tube or SS headphone amps. I've been tossing up whether I'd...

Anybody tried the mk VII with Alessandro MS Pros or any other 30 ohm cans yet? Impressions? Any hissing like reported with the mk V on low impedance cans?