电源：直流3.7 V内置锂离子可充电电池
http://www.sonystyle.com.cn/products/headphone/pha_2.htm
http://www.xmos.com/news/07-oct-2013/xmos-helps-sony-sound-better
http://www.oppodigital.com/headphone-amplifier-ha-1/
http://www.xmos.com/news/14-apr-2014/Oppo-Digital-selects-XMOS-for-audiophile-products
FYI, JAC also release a similar product.
http://www3.jvckenwood.com/accessory/index.html
JVC便携耳放
http://www.v2gg.com/xiaozhong/tongxinglian/20140513/210289.html
http://www.computeraudiophile.com/content/505-meridian-explorer-usb-dac-review/
http://www.whathifi.com/news/meridian-introduces-£250-explorer-usb-dac-headphone-amp
http://www.pcadvisor.co.uk/reviews/audio/3426826/musical-fidelity-v-link-192-review/
http://www.kef.com/html/us/showroom/digital_music_solutions/x300a/overview/
这一家说是目前最好hifi dac ,估计有的人会妒忌了 ！
http://www.hifiplus.com/articles/hrt-music-streamer-hd/?utm_campaign=Hi-Fi++Weekly+Emails&utm_medium=email&utm_source=email-103
新发布的日本adl x1 产品 ：
http://www.adl-av.com/products/headphone_amplifiers/x1/
maxim 的MAX98355 标准评估板用xmos 作为主平台， 主要用在手机或者移动式设备上。 主要是class-d 的类别放大器。
http://www.maximintegrated.com/datasheet/index.mvp/id/7502
美联达产品 http://www.expertreviews.co.uk/gadgets/1301401/meridian-audio-director
这个产品好像是用16个核的芯片做的，还带多中dsp 音效和led 控制等。
http://designwsound.com/dwsblog/recordings/audiophile-jazz-prologue-3-free-hi-res-samples/
http://designwsound.com/dwsblog/
http://www.musicaacoustics.com/wp/uncategorized/venture-craft-go-dap-tt-type-tube-made-in-japan/
http://www.post76.com/x2/forum.php?mod=viewthread&tid=144353&extra=&page=2
开源项目，非常有趣的东西。
http://www.kickstarter.com/projects/gavn8r/geek-a-new-usb-awesomifier-for-headphones?ref=live
