1. 手册 Page15 面板时钟源选择规则（原文）
The DAC Path has two primary clock master modes:
1. Internal (INT)：Converter uses its on-board crystal oscillator as the primary timebase. All digital outputs and conversion rates are locked to this internal reference. Any incoming external Word Clock signal is ignored for rate selection; sample rate is fixed by the unit’s internal divider, USB driver sample rate changes will not alter conversion speed.
2. External (EXT / WK Input)：Converter takes primary timebase from the rear-panel Word Clock BNC input. The internal PLL automatically multiplies/divides the incoming WK reference to match the sample rate of the digital input stream (USB/AES/SDIF). When EXT is selected, the unit follows the sample rate flag embedded in the USB data stream controlled by the PC driver.
翻译：
DAC通路两种主时钟模式：
2. 手册 Page19 WK基准与数据流采样率独立分频机制（关键）
Word Clock provides only a low-jitter fixed reference frequency (44.1k / 48k base). It does not lock the unit to a single playback sample rate. The internal PLL maintains a fixed integer ratio between the WK reference frequency and the active audio sample rate.
Example: 44.1kHz WK input can drive 44.1 / 88.2 / 176.4kHz playback; 48kHz WK drives 48 / 96 / 192kHz. The USB interface (CSP clock mode) reports the stream rate to the converter, which reconfigures its PLL divider on the fly.
翻译：
字时钟仅提供低抖动基准频（44.1/48k基础频），不会锁死单一播放采样率。内部PLL在WK基准与当前音频采样率之间维持固定整数分频比。
例：44.1k WK可支持44.1/88.2/176.4k播放；48k WK支持48/96/192k。CSP模式USB界面向转换器上报数据流速率，DAC实时重配PLL分频器完成采样率切换。
二、USB驱动 CSP（Clock Source Processor）官方说明（手册 USB 驱动附录）
驱动文档 USB Sync Modes 段落
CSP Mode (Default for Audio Playback)
The USB interface runs its own isolated low-jitter local clock (Clock Source Processor). This clock handles asynchronous USB data buffering and transmits stream sample rate metadata to the ADA-8XR.
When DAC clock = INT：CSP metadata is ignored; DAC rate fixed internally.
When DAC clock = EXT (Word Clock locked)：CSP sample rate metadata controls the DAC PLL divider, allowing real-time sample rate switching via the PC audio control panel.
EXT Sync Mode (For Studio Multi-unit Lock Only)
Driver clock locks fully to external WK; PC cannot manually change sample rate—rate is forced to match the incoming Word Clock frequency. Not recommended for single-box audiophile playback.
翻译：
CSP模式（回放默认）
USB界面运行独立隔离本地时钟CSP，负责异步缓冲并向8XR发送采样率元数据。
三、对你现象的手册结论原文佐证
If Word Clock is connected to the WK input, driver set to CSP:
Front panel clock = INT PC sample rate changes have no effect on conversion rate.
Front panel clock = EXT DAC automatically re-locks to the sample rate selected in the PC driver, using the WK signal as the master low-jitter reference.
This behaviour is part of the standard hardware clock architecture and is not a fault.
翻译：
若WK字时钟接入、驱动设为CSP：
