inputs.text: awesome value - purchased cute beyond talked 30 minutes tech firestoneaudiophile \\cute\\ headphone amps power supplier alone amazing phone calls emails often left unanswered days good people good service good products short version learned want quiet headphone amp first objective purchase batterypowered amplifier like \\cute ii battery\\ run batteries noise caused actodc power conversion \\cute ii battery\\ essentially silent running battery power two 9volt rechargeable userreplaceable batteries providing nearly perfect silence 10 hours per charge want fairlypriced powerful responsive amp second objective purchase something like \\cute beyond\\ certain company also sells upgraded power supply like \\supplier\\ case want even less noise actodc conversion going drive low impedance set headphones likely need additional currentdelivering capacity upgraded power supply wallwarts cant deliver enough smooth power since spent much time about200 market small ordered \\cute beyond\\ give listen improvement adcom preamp denon receiver headphone sections profound much quieter much musical clarity could still hear noise floor 104db not ego hearing professionally tested explosion hear somewhat farther reaching frequency range humans much lower volume levels vast majority not give \\supplier\\ chance lower floor still another 10db provide enhanced clarity presence rich sound stage lot good clean andresponsive power supply not believe rhetoric return postage worry offered waive shipping cost end cool 10 experiment skepticism shattered within minutes washed away sea brilliant present clear sound simply amazing blew away lay grinning still easily hear noise floor 115db problem not equipment two skepticismshattering weeks album album revealed subtleties never heard good notsogood new instruments appeared former nowhere articulate crescendos soft muddy recommendation recommendation batteries portability low noise floor drivers step cute beyond want step supplier want even total cost including shipping 314 profound musical awakening sennheiser hd280pros great anticipation enough cash reach pair denon ahd5000s already current power drive awesome [ ] great listening awaits