ECHO Pro Activation

ECHO Pro costs ¥69.99 and is provided through the sponsorship channel. After purchasing it on Afdian, copy the complete order number, usually starting with 2026, and activate it inside ECHO.

PCM and SDM for Pro users

ECHO PCM / SRC upsampling applies high-quality sample-rate conversion after decoding. It follows the 44.1 kHz and 48 kHz rate families and exposes multiplier, filter, quality, and CPU / CUDA choices. The result remains PCM.
ECHO SDM / PCM-to-DSD oversamples and filters PCM, then uses sigma-delta modulation and noise shaping to generate 1-bit DSD / SDM. It is not native DSD passthrough or ordinary PCM upsampling, and it requires a compatible DAC, driver, and enough real-time compute.

Higher rates are not automatically better. Start SDM at a lower DSD rate, stay within the DAC’s documented capabilities, and return to PCM immediately if you hear noise or dropouts, get silence, or cannot open the device.

Before You Start

You will need:

ECHO Next installed and opening normally.
ECHO Pro purchased for ¥69.99 on the Afdian ECHO Next page, with the payment confirmed as complete.
Your QQ number. It is used for order ownership, after-sales lookups, and later unbinding.
The order number from the Afdian order details. Copy the complete order number, usually starting with 2026.

The order number is not your QQ number and not any other transaction ID from a payment screenshot. If activation fails, first check that you copied the complete Afdian order number.

Activation Steps

Open ECHO Next.
Go to Settings -> General.
Open Pro Activation.
Choose the Afdian order activation mode.
Enter your QQ number.
Paste the complete order number starting with 2026.
Follow the page prompt to finish activation.

Once activation succeeds, ECHO enables Pro for the current device. If the page asks you to restart the app, restart once.

About HWID Binding

ECHO Pro is bound to the current device HWID (machine identity). The order number, QQ number, and current device form one binding record. Replacing the computer, reinstalling the system, or major hardware changes may change the HWID, so an old binding may not carry over.

Do not post your order number in groups, forums, or screenshots.
Do not lend the order number to others; an abused order affects your own device binding.
Each order can bind a limited number of devices; the activation page shows the exact limit.
Before switching devices, release the old slot on the device unbinding page (currently Chinese-only).

If Something Goes Wrong

Report purchase, activation, HWID, unbinding, or entitlement problems in the ECHO Pro group, and include:

The Afdian order number (do not share it publicly).
The QQ number used during activation.
Your ECHO version and system version.
A screenshot of Settings -> General -> Pro Activation.
The exact error message shown on failure.

Do not describe the problem as “it just doesn’t work”. Say whether the order number starts with 2026, which step failed, and what the page displayed. See How To Solve Problems for how to write a useful report.