diff --git a/tests/integration.c b/tests/integration.c
index b4af381..0114252 100644
--- a/tests/integration.c
+++ b/tests/integration.c
@@ -944,15 +944,17 @@ static int test_wav_load(void) {
         unlink("loop.wav");
         return 1;
     }
-    safe_usleep(4000000);
+    safe_usleep(6000000); /* 6 seconds to ensure loop is heard */
     jack_deactivate(client);
     jack_client_close(client);
     kill(pid, SIGTERM); waitpid(pid, NULL, 0);
     unlink("loop.wav");
     int got_bursts = bursts;
-    printf("  detected bursts: %d\n", got_bursts);
+    double rms = passthrough_total_samples > 0 ?
+                 sqrt(passthrough_sum_sq / passthrough_total_samples) : 0.0;
+    printf("  detected bursts: %d, RMS: %.6f\n", got_bursts, rms);
     if (got_bursts < 3) {
-        fprintf(stderr, "  FAIL: expected ≥3 bursts from loaded loop, got %d\n", got_bursts);
+        fprintf(stderr, "  FAIL: expected ≥3 bursts from loaded loop, got %d, RMS=%.6f\n", got_bursts, rms);
         return 1;
     }
     printf("  PASS (loaded loop plays)\n");