Thank you for your feedback. We'll revise it right away. The download link: http://fiio-file.fiio.net/FiiO_USB_DAC_Driver-V4.47.0.zip

Model: BTA10 Special for Audio-Technica ATH-M50X Headphones. Launch time: expected at the end of December. 1. Support SBC\AAC\aptX\aptXLL, QCC3005 Bluetooth chip. Android 5.0 version. 2. Support Bluetooth phone call, built-in microphone, control call, hang up (support CVC noise reduction)...

Sorry, we have stopped this model, focusing on Bluetooth AMP products.

It can be understood that the output power of BTR1K and BTR3 is the same, and the difference is only the support of Bluetooth format. If you only use iPhone, BTR3 is wasteful for you, because it can't use other formats like LDAC. And BTR1K is just right for you, BTR1K also with a RGB...

The pull test of earphone socket has been done. If 2.5 cable is pulled up, K3 will be removed together, because the k3 is very light, not a heavy desktop machine.

If you want to understand the process of product development, please click this post. https://www.head-fi.org/threads/new-desktop-usb-dac-amp-fiio-k3-e30-384k-32b-dsd-dop-typec.883341/

FiiO K3 Preview Tour Starts Now!-- The All-New Desktop DAC/Amplifier https://www.head-fi.org/threads/fiio-k3-preview-tour-starts-now-the-all-new-desktop-dac-amplifier.889473/?tdsourcetag=s_pctim_aiomsg

Just now, today we are ready to collect audition, a new product, the market positioning is higher than E10K. New product model K3. https://www.head-fi.org/threads/new-desktop-usb-dac-amp-fiio-k3-e30-384k-32b-dsd-dop-typec.883341/

K3 trial production is completed, ready to organize audition experience activities.

We decided to modify the model E30. The new model: K3.

These sockets are staggered up and down, and the distance between them is appropriate. We used two PCBs to achieve this way.

E30 is the ADC volume design, not the analog volume, LO volume is also through the DAC, not a fixed volume. USB-C cable and the coax cable, you can see that: Due to the compact design of the space, the COA plug can be used with a diameter <13mm.

I think there will be a chance for you to compare and prepare thie, It is expected to be ready for a tour audition next month.. Of course, I will definitely say that the E30 is better.:)

variable output, Can adjust the volume.