diff --git a/meow_ui_vol.c b/meow_ui_vol.c
index 6269bad..b10cf35 100644
--- a/meow_ui_vol.c
+++ b/meow_ui_vol.c
@@ -110,9 +110,10 @@ int meow_ui_vol_step(const char *path, int dir)
  * 与 launcher meow_dac_vol_write / watchdog wd_vol_write 完全同路径（语义同源）。 */
 void meow_ui_vol_dac_write(int pct)
 {
-    int dac = 255 - pct * 255 / 100;   /* CS43198 寄存器=衰减量(0=最响 255=静音)，用户 pct 越大越响 → 反转映射 */
-    if (dac < 0) dac = 0;
-    if (dac > 255) dac = 255;
+    int t = 100 - pct, dac;
+	if (pct <= 0) dac = 255;                    /* 真静音（DS1039：255=-127.5dB） */
+	else dac = t * t * 192 / 10000;             /* 感知平方锥度：dB 衰减=(1-pct)^2×96dB */
+	if (dac > 255) dac = 255; if (dac < 0) dac = 0;  /* CS43198=衰减量(0最响255静音)+平方锥度(听感线性) */
     char cmd[160];
     snprintf(cmd, sizeof cmd,
              "amixer -c 0 cset numid=1 %d >/dev/null 2>&1; amixer -c 0 cset numid=2 %d >/dev/null 2>&1",