Index: firmware/export/as3514.h
===================================================================
--- firmware/export/as3514.h	(Revision 29855)
+++ firmware/export/as3514.h	(Arbeitskopie)
@@ -300,6 +300,10 @@
 
 /* AUDIOSET2 (15h) */
 #ifdef HAVE_AS3543
+#define AUDIOSET2_BIAS_on      (0x0 << 7)
+#define AUDIOSET2_BIAS_off      (0x1 << 7)
+#define AUDIOSET2_SUM_off      (0x1 << 6)
+#define AUDIOSET2_AGC_off       (0x1 << 5)
 #define AUDIOSET2_HPH_QUALITY_LOW_POWER (0x0 << 4)
 #define AUDIOSET2_HPH_QUALITY_HIGH      (0x1 << 4)
 #else
Index: firmware/drivers/audio/as3514.c
===================================================================
--- firmware/drivers/audio/as3514.c	(Revision 29855)
+++ firmware/drivers/audio/as3514.c	(Arbeitskopie)
@@ -151,9 +151,9 @@
 #ifdef HAVE_AS3543
 
     as3514_write(AS3514_AUDIOSET1, AUDIOSET1_DAC_on | AUDIOSET1_DAC_GAIN_on);
-    as3514_write(AS3514_AUDIOSET2, AUDIOSET2_HPH_QUALITY_LOW_POWER);
+    as3514_write(AS3514_AUDIOSET2, AUDIOSET2_AGC_off | AUDIOSET2_HPH_QUALITY_HIGH);
     /* common ground on, delay playback unmuting when inserting headphones */
-    as3514_write(AS3514_AUDIOSET3, AUDIOSET3_HPCM_on | AUDIOSET3_HP_LONGSTART);
+    as3514_write(AS3514_AUDIOSET3, AUDIOSET3_HPCM_on | AUDIOSET3_HP_LONGSTART | AUDIOSET3_HP_BIAS_150);
 
     as3514_write(AS3543_DAC_IF, AS3543_DAC_INT_PLL);
     /* Select Line 2 for FM radio */