i read the review HRT HeadStreamer on this forum and they said HeadStreamer have two version. and the newest one was compatible with iPad and Android device. maybe i was trying the old one so it cannot support to my iPhone

update : Matrix mini portable was work with CCK + iPhone 4S. so the setup is : iPhone 4S + CCK + USB Male Type A to Mini USB Male Type B + Matrix Mini Portable   and i try little bit experiment, i was try with this   so the setup is : iPhone 4S + CCK + USB Male Type A to USB Male Type A...

i've tried with iPhone 4S > CCK > GoVibe Mini U-DAC works fine. and you can control volume using built in volume control on iPhone 4S I also tried with iPhone 4S > CCK > USB A to mini usb > Pico Dac / Pico DAC+AMP works fine too but with Govibe Martini U and GoVibe VestAmp DAC, my iphone just...