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Why does Windows require the Khadas USB driver?

The Khadas USB driver provides ASIO support and removes the latency and sample rate conversion issue experienced with
the default Windows USB driver for DACs.

What is Balanced-RCA?

A new balanced audio connector standard, designed by Khadas for small form-factor desktop DACs. It is backwards compatible with standard RCA plugs and cables, more details visit

How do I use my existing XLR-3 equipment with Balanced-RCA?

Purchase the Khadas Balanced-RCA to XLR-3 adapter, it is a male Balanced-RCA plug connected to a male XLR-3 plug.

How do I use “S/PDIF” input?

Attach a standard RCA cable to the orange-coloured RCA jack, and set the input mode to “S/PDIF”. Alternatively, set the input mode to “AUTO”and stop music playback from other sources.

How do I connect my smartphone to Tone2 via Bluetooth?

Attach a Khadas bluetooth module to the USB-C (I2S) port, and set input mode to “I2S”.

Can the USB-C input be used with the USB-C output of Android phone?

Yes, Tone2 can be powered by most Android smartphones via USB-C.

What are the input priorities of the “Auto” input mode?

When connecting both USB-C (USB) and S/PDIF interface in “Auto” input mode, “USB” input has the highest priority.
When music playback over USB is stopped (you do not need to remove the USB cable), input will switch to the “S/PDIF”.

Can I connect Tone2 to my iPhone or iPad?

Apple’s iPhone does not support the Tone2. You can still connect Tone2 to your iPad using a USB-C to C cable, but the Tone2 device information will not appear on your iPad.

Does the Tone2 support native DSD decoding?

Yes, DSD512 native decoding can be enabled by installing the Khadas USB driver.

What is the voltage level of the Balanced RCA connection?

4.0Vrms for balanced RCA mode, and 2.0Vrms for standard RCA mode (single-ended).

Can I use the Tone2 to receive a signal from the TV via coaxial and send it to the amplifier via RCA?

Yes. Set the input mode as “S/PDIF” or “Auto”, Tone2 will output to the RCA.

Can I supply power to the USB (I2S) interface using my computer, PC or laptop?

No. Please instead connect a linear power supply or battery bank to the USB (I2S) interface.

How do I adjust the HID (system) volume using the volume knob?

When Tone2 is not at or above maximum volume, turning the volume knob clockwise will increase the device’s hardware
volume. Once Tone2 is at maximum volume, continuing to turn the knob clockwise will cause the RGB indicator to flash
turquoise 3 times. Continuing to turn the knob clockwise after this point will instead increase the HID (system) volume of
your PC.

Why can’t I adjust the HID volume whilst playing DSD formatted audio?

Tone2 does not support HID volume adjustment whilst playing DSD formatted audio.

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