If you were to get just 1 upgrade, which would it be? I use a Soekris 1321, bottlehead Crack and MTCH . In the wings, I have a Modi Multibit, Aune X1S and Teac UD H01 for dacs. I have a Project Ember with tubes and tube adapters and a Magni 3. Sources are Jriver on Windows 10 and a raspi with dac502, picoreplater and LMS. A Phillips vintage cd recorder/player with spdif out also sits unused. And I have a HD650K, HD 58X Jubilee and a HE-4xx with a Verum on the way. JBL LX30x's complete the picture, or the tv with optical completes the picture better. I have thoughts but wanna hear as many other ideas as I can, so chime in with whatever you want. Dislike free zone, at least from my end.