Thank you for the correct reminder. Sorry we neglected to introduce how to use it. Please refer to the two pictures I added.

K9PRO is the flagship all-in-one desktop, so the specifications and performance will follow the highest standards. The price will be higher than 800 US dollars.

The target release date is March next year，please give us more time to change the audio DAC chip.

Yes, we will continue the K9 project with ES9038PRO*2，the functions and circuit will be changed also. We maybe start K9Pro first

Unfortunately, BB AUDIO DAC chip does not support high sampling rates，such as 384k

BTA30 has RCA output for analog audio signal， and coaxial+optical output for digital audio signal. K5pro has same one，so you can connect them through RCA or coaxial， or optical.

Yes, you are correct. Great！

Regarding this project, we will continue the product specifications. But the difficulties are more complicated than we thought. For example, we need to change the design to the ESS DAC because of the fire in the AKM factory

Thank you for your attention and feedback for BTA30. In order to make BTA30 more functional and cover more usage scenarios, we have tried our best to adjust hardware and software architecture . For this reason, it also led to serious delays in the project. Until it goes on the market, we are...

This combination has no problem, because 5V is a universal power supply

That's a good suggestion， we will check the AKM datasheet and confirm it, such as noise and THD audio specifications. :beerchug:

FiiO K3, the desktop USB DAC&Headphone amplifier can support optical output： https://fiio.com/k3

Sure, if you have a car power adapter, because BTA30 is powered by 5V input. Please note，BTA30 has no battery inside.

We originally planned to launch K7 by the end of 2020. The engineer team are working hard to advance the K7 sales date to October，K7Pro will be December. The current price cannot be determined because some technical specifications and materials have not been determined. Our goal is not low...

I think we can remain both USB B and USB C interface， the USB B is located on the back panel and USB C is on the right side. You can connect your smartphone with K7 through USB C more easily

yes, K7 will follow the same design as K3 and K5Pro. :beerchug: The light ring color will change according to different sampling rate and DSD

yes, SE output. under 16Ω THD<1%，BTR3 output 33mW; BTR3K output 50mW

Compared with AK4376A, AK4377A improved the output current capability. For example, under 16Ω load, the output power increase 50%

Yes, adding DAC functionality will increase the cost of K7. This is really a waste for customers who have one of them. However, if the DAC and AMP are separated, the cost will increase even more. Because we need 2 sets of power supply, 2 sets of metal shell, 2 sets of processors and so on...

Thanks for your advice. In our plan, we will consider making a pure amp without DAC, even a simple DAC with Line OUT. But these are obviously narrower or high level market. Need to collect more user needs before we start it.

For 1）： APP control is also very convenient. Because we plan to automatically connect to the APP after the K7 is turned on. Of course, switching is more efficient. As you know, do users often switch between line out and pre-out？ BTW，k7 will have a fully balanced audio circuit, including volume...

If I still use a power adapter and design an isolation circuit inside the K7, and reconstruct the DC power supply. Because of the isolation circuit, the positive and negative power supply after processing will be more pure. That's to say, there are ways to improve the power quality of DC...

Sure, as I mentioned， we will design BLE link and APP control for K7. Through that， users can set the output level adjustable or not, and select which port output.

Thank you for understanding. I have no plans to add Chromecast/Google-cast, because we are not only thinking about multi-functionality when product plan, but also making the current functions reliable. We really don’t have enough experience with the transmission quality and stability of wifi...

For understanding of balanced circuit architecture, you can refer to M11Pro or AM3D, they use THX AAA 78. I think THX AAA 788 can achieve real balanced output and it's output impedance is very low. Because the final specification must meet the THX certification requirements before they can be sold