Hi Marco,
I think i understand where you're coming from, but i don't necessarily agree. We all like to understand how something works, i used to race motorcycles and tuned my own engines - gave me a lot of mechanical sympathy, and i was able to hear and feel what the engine was doing, change gear at the top of the torque curve etc etc. Didn't help me win races - too fat !
I've never been interested in spending money for money's sake, or keeping up with the Jones's, but i have been through 3 amplifiers in the last twelve months. Each time i auditioned them at the sellers house, took my 'old' amplifier and a bunch of very familiar cd's with me, then A/B'd them until i had made a decision, and i auditioned more than i bought.
Each one was an upgrade, and i wasn't concerned that single ended should have sounded better than push-pull, or 6L6 sounded better than 845...
I've never heard a grounding box, but having read quite a lot about them think that i've got a handle on how they 'might' work. That's good enough for me, but i don't have the spare coin to invest right now, so going to look at optimising my system, and balanced mains........Cue can of worms..
PS Audio Directstream DAC, modified Dennon DVD player, SP10, Trans Fi linear tracker, Stack audio streamer
1980's Aloia 6L6 prototype, Cat's Whiskers Autum Leaves 300 B mono blocks, Definative Audio modded Rogue 88 Magmum 6550. Firebottle LDR battery pre. Classe 103, Herron VT2
RFC Tannoy Cheviot's,Wilmslow Audio modified Chario Academy Millenium II's,Frankenstein DIY's, Oris Onken horns, Fostek full range drivers
Ripnas etc