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    First... What is a “Transport”

    Basically you have your music on the cloud or on your PC/NAS. If it’s on the cloud , you will use your smartphone to access your account and play. From your smartphone, in order to send the music to your DAC (DACs have USB and/or S/PDIF inputs) you need a transport that will be visible (to your smartphone / tablet /PC) as an Airplay device (iOS ) or UPNP/DLNA (Android/PC).

    Our transports have different outputs. USBridge is feeding your DAC through USB and DigiOne is using coaxial/bnc. Depending on your DAC inputs you need to make a choice.


    Includes Sparky + USBridge + eMMC 16GB + Acrylic Case + 5v PSU

    Every DAC needs a source. For USB input we created the USBridge. (DigiOne is for S/PDIF).

    So why not use a cheap laptop, RPI or even Sparky as a USB transport? Well you can, but they all have some limitations.

    First, laptops are noisy... very noisy. On USB we usually see spikes at 100mV of noise. That will have an impact on sound system.

    How about RPI? RPIs are great and very energy efficient, but on USB they have 2 major flaws. First is that bandwidth is shared between the 2 USB ports (so in fact there is only one USB), and second is that ethernet is also shared on same bus! Of course, you also have the noise on USB at about 60mV.

    Maybe Sparky? The 2 USB ports (next to the ethernet port) share one input to the CPU (split by a hub). Noise on USB bus is about 27mV (pretty good) and ethernet is completely apart (bus is not shared). So it's ok, but not great.

    So we developed a new board that is connected to the bottom of Sparky. Sparky has 2 independent USB controllers (2 highways), and we connect to the second one. Then we use a new USB IC that reclocks the stream using hi quality NDK Oscillators, and everything is powered by independent LDOs and hi frequency filters. The final noise of the USBridge is lower than the noise of a battery.


    深圳市珀璞家电技术有限公司是一家从事家庭音响设计、生产、销售为一体的专业公司, 公司所拥有的“璞 Popu”音响品牌,自2007年进入市场以来,凭借一流的设计, 过硬的生产质量和经销商的真诚合作,已在广大客户中建立了良好的品牌知名度和信誉度。



    • 公司地址:

      中国 广东省 深圳市 福田区新洲路新洲大厦C栋P层8号

    • 电话: +(86) 0755-83300989
      传真: +(86) 0755-23931166