"Sshtrip", "purestrip", "nanostrip" , "Zapp / Zapper" -> To indicate the stripping down of power to a desirable amount to drive earphones but playing around the word Shh etc..
"NanoPower", "Capz", "S-cap" to indicate power control
" i / X / S - quiet" , " tranquilo" "Hush" -> To indicate silence
"Surfer" , "Glider" , "Stealth" , "Grasshopper" , " The Fly", => These word combinations seem associated with smoothness and silence at the same time
Just playing around with related concepts but not too sure what exactly is required ifi. My 2 cents above. Hope they help !