diff --git a/include/dsd.h b/include/dsd.h
index 472ec9c..9f8a489 100644
--- a/include/dsd.h
+++ b/include/dsd.h
@@ -666,6 +666,10 @@ typedef struct
   LPFilter RCFilter8;
   HPFilter HRCFilter8;
   // PBFilter PBF;
+  LPFilter RCFilterL;
+  HPFilter HRCFilterL;
+  LPFilter RCFilterR;
+  HPFilter HRCFilterR;
 
   char dpmr_caller_id[20];
   char dpmr_target_id[20];
diff --git a/src/3.c b/src/3.c
index 8d5c238..1c4192b 100644
--- a/src/3.c
+++ b/src/3.c
@@ -468,6 +468,12 @@ void init_audio_filters (dsd_state * state)
 	LPFilter_Init(&state->RCFilter8, 160, (float)1/(float)8000);
   HPFilter_Init(&state->HRCFilter8, 160, (float)1/(float)8000);
 
+	//left and right variants for stereo output testing on digital voice samples
+  LPFilter_Init(&state->RCFilterL, 960, (float)1/(float)48000);
+  HPFilter_Init(&state->HRCFilterL, 960, (float)1/(float)48000);
+  LPFilter_Init(&state->RCFilterR, 960, (float)1/(float)48000);
+  HPFilter_Init(&state->HRCFilterR, 960, (float)1/(float)48000);
+
 	//PBFilter_Init(PBFilter *filter, float HPF_cutoffFreqHz, float LPF_cutoffFreqHz, float sampleTimeS);
 	// void NOTCHFilter_Init(NOTCHFilter *filter, float centerFreqHz, float notchWidthHz, float sampleTimeS);
 
diff --git a/src/dsd_audio.c b/src/dsd_audio.c
index c035d4b..a10ff82 100644
--- a/src/dsd_audio.c
+++ b/src/dsd_audio.c
@@ -308,6 +308,8 @@ processAudio (dsd_opts * opts, dsd_state * state)
           *state->audio_out_buf_p = (short) *state->audio_out_float_buf_p;
           //tap the pointer here and store the short upsample buffer samples
           state->s_lu[n] = (short) *state->audio_out_float_buf_p;
+          //hpf test
+          state->s_lu[n] = HPFilter_Update(&state->HRCFilterL, state->s_lu[n]);
           state->audio_out_buf_p++;
           state->audio_out_float_buf_p++;
         }
@@ -328,6 +330,8 @@ processAudio (dsd_opts * opts, dsd_state * state)
           *state->audio_out_buf_p = (short) *state->audio_out_temp_buf_p;
           //tap the pointer here and store the short buffer samples
           state->s_l[n] = (short) *state->audio_out_temp_buf_p;
+          //hpf test
+          state->s_l[n] = HPFilter_Update(&state->HRCFilterL, state->s_l[n]);
           //debug
           // fprintf (stderr, " %d", state->s_l[n]);
           state->audio_out_buf_p++;
@@ -455,6 +459,8 @@ processAudioR (dsd_opts * opts, dsd_state * state)
           *state->audio_out_buf_pR = (short) *state->audio_out_float_buf_pR;
           //tap the pointer here and store the short upsample buffer samples
           state->s_ru[n] = (short) *state->audio_out_float_buf_pR;
+          //hpf test
+          state->s_ru[n] = HPFilter_Update(&state->HRCFilterR, state->s_ru[n]);
           state->audio_out_buf_pR++;
           state->audio_out_float_buf_pR++;
         }
@@ -475,6 +481,8 @@ processAudioR (dsd_opts * opts, dsd_state * state)
           *state->audio_out_buf_pR = (short) *state->audio_out_temp_buf_pR;
           //tap the pointer here and store the short buffer samples
           state->s_r[n] = (short) *state->audio_out_temp_buf_pR;
+          //hpf test
+          state->s_r[n] = HPFilter_Update(&state->HRCFilterR, state->s_r[n]);
           state->audio_out_buf_pR++;
           state->audio_out_temp_buf_pR++;
           state->audio_out_idxR++;