diff --git a/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt b/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
index de2dc16..5c80cb1 100644
--- a/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
+++ b/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
@@ -857,6 +857,18 @@ class MainActivity : AppCompatActivity() {
                                                                         SpeakerRecognition
                                                                             .fastRegistry
                                                                             .addAuto(it, emb)
+                                                                        // 双空间注册(2026-09-16 S2 双号实锤):
+                                                                        // 只写 fast 镜像时,后续 endpoint 准确判定
+                                                                        // 认不出同一人 → 重新发号(S1/S2 分裂)
+                                                                        SpeakerRecognition
+                                                                            .computeEmbedding(
+                                                                                win,
+                                                                                sampleRateInHz)
+                                                                            ?.let { acc ->
+                                                                                SpeakerRecognition
+                                                                                    .registry
+                                                                                    .addAuto(it, acc)
+                                                                            }
                                                                     }
                                                             Log.i(TAG, "SWITCH-FORCE" +
                                                                     (if (deepLow)