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.

Tuning is a reference to existing product FiiO Q1Ⅱ, because the output power is bigger than Q1Ⅱ, so I feel better. It's hardware is basically the same as Q1Ⅱ. As I said before, E30 is a desktop version.

Engineering prototype

Thank you. The price is about 100 dollars. At present, we have completed the engineering prototype assembly, probably listened to it, the sound is the kind I like.

Yes, Plug USB and play. With USB Driver-free mode: No need to install any drive once you select the "driver-free" mode.

Sorry, I'm going to pay attention to it.

The circular silica pad used by E10K is easy to fall off. So this time it will chang into a rectangle. And mark the 4pcs in the package. I have compared EVA, Rubber and Foam gaskets. EVA is too soft and easy to break. Rubber is easy to stick to dust. The most suitable one is the foam (PORON...

It's almost the same as Q1Ⅱ. If you want more power, I suggest you use the 2.5 balanced output, but I don't know if your headset can be used like this.

AK4452+OPA1662*2

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 -----------September 22-------------------------------- K3 trial production is completed...

I used my limited English level, with the help of Google translation, to finish read your words. It is very complete and very attentively. Thank you very much for your sharing.