diff --git a/components/audio_router/audio_router.c b/components/audio_router/audio_router.c
index 090c1c8..3f6c605 100644
--- a/components/audio_router/audio_router.c
+++ b/components/audio_router/audio_router.c
@@ -23,7 +23,7 @@ typedef enum { TONE_NONE, TONE_DIAL, TONE_BUSY, TONE_RINGBACK } tone_mode_t;
 
 #define SR    PLIP_SAMPLE_RATE   /* 16000 — doit correspondre à hal_i2s */
 #define FRAME 320                /* 20 ms @ 16 kHz */
-#define TONE_AMPLITUDE 8000.0f
+#define TONE_AMPLITUDE 14000.0f
 #define TONE_FREQ_HZ   440.0f
 
 static volatile tone_mode_t s_mode      = TONE_NONE;
diff --git a/components/hal_i2s/hal_i2s.c b/components/hal_i2s/hal_i2s.c
index 76889ac..67abc31 100644
--- a/components/hal_i2s/hal_i2s.c
+++ b/components/hal_i2s/hal_i2s.c
@@ -13,7 +13,7 @@
 #define TAG "hal_i2s"
 
 #define HAL_I2S_SAMPLE_RATE   PLIP_SAMPLE_RATE   /* 16000 */
-#define HAL_I2S_EARPIECE_VOL  60                 /* écouteur combiné : confortable */
+#define HAL_I2S_EARPIECE_VOL  95                 /* écouteur combiné : niveau haut */
 
 static i2s_chan_handle_t s_spk_handle = NULL;
 static i2s_chan_handle_t s_mic_handle = NULL;