diff --git a/build/libraries_sysmenu/ds/ARM7/src/ds_volume.c b/build/libraries_sysmenu/ds/ARM7/src/ds_volume.c
index edf532f2..0b7b1e41 100644
--- a/build/libraries_sysmenu/ds/ARM7/src/ds_volume.c
+++ b/build/libraries_sysmenu/ds/ARM7/src/ds_volume.c
@@ -213,8 +213,8 @@ void DS_SetSpeakerVolume( void* romHeaderNTR )
 	if (hit)
 	{
 		// NTR並のSP音量(マイク入力問題のあるDSタイトル）
-		CDC_WriteSpiRegisterEx( 1, REG_CDC1_SP_ANGVOL_L_ADDR, (u8)(CDC1_ANGVOL_E | CDC1_ANGVOL_GAIN_NTR_SP) );
-		CDC_WriteSpiRegisterEx( 1, REG_CDC1_SP_ANGVOL_R_ADDR, (u8)(CDC1_ANGVOL_E | CDC1_ANGVOL_GAIN_NTR_SP) );
+		CDC_WriteSpiRegisterEx( 1, REG_CDC1_SP_ANGVOL_L_ADDR, (u8)(CDC1_ANGVOL_E | DS_ANGVOL_GAIN_SP_SPECIAL) );
+		CDC_WriteSpiRegisterEx( 1, REG_CDC1_SP_ANGVOL_R_ADDR, (u8)(CDC1_ANGVOL_E | DS_ANGVOL_GAIN_SP_SPECIAL) );
 	}
 	else
 	{
diff --git a/include/sysmenu/ds/common/ds.h b/include/sysmenu/ds/common/ds.h
index 5d4dd96c..afdf38b0 100644
--- a/include/sysmenu/ds/common/ds.h
+++ b/include/sysmenu/ds/common/ds.h
@@ -27,6 +27,7 @@ extern "C" {
 #define DS_REDRSV_PATCH_FUNC_ADDR			( HW_RED_RESERVED + 0x1c )
 #define DS_WLPATCH_SIZE						(5*4)
 #define DS_WLPATCH_COPYCODE_SIZE			(10*4)
+#define DS_ANGVOL_GAIN_SP_SPECIAL           0x2A  		// -21.1dB
 
 void DS_InsertWLPatch( void* romHeaderNTR );
 void DS_SetSpeakerVolume( void* romHeaderNTR );