diff --git a/lib_com/options.h b/lib_com/options.h
index 9730f271a66ebc87bfa1b1d5afffe2965995a320..ac4ec92a18b1faf6eec1835c2d57853c27a597c9 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -83,6 +83,7 @@
 #define FIX_1766_TCX2ACELP_BWE_ISSUE                         /* VA : Fix rare BWE issue when switching from TCX to ACELP */
 #define FIX_1781_SPECTRAL_GAPS                               /* FhG: Change internal calculation of tcx_noise_factor_ivas_fx() to 32-bit*/
 #define FIX_ISSUE_1811_EXCEEDING_W_SHIFTS                    /* FhG: limit exceeding 64bit shifts */
+#define FIX_1843_IO_QFACTOR_INIT                             /* FhG: initialize CRend's io_qfactor also in IVAS_rend */
 
 
 /* #################### Start BASOP porting switches ############################ */
diff --git a/lib_rend/lib_rend_fx.c b/lib_rend/lib_rend_fx.c
index 75a6de0d686c94cf6dff5de74ad1548d8f65e7e5..14813f619a116fe1eceeb7f871c92d6e73b98c59 100644
--- a/lib_rend/lib_rend_fx.c
+++ b/lib_rend/lib_rend_fx.c
@@ -246,8 +246,11 @@ static void freeMasaExtRenderer( MASA_EXT_REND_HANDLE *hMasaExtRendOut );
 static void intermidiate_ext_dirac_render( MASA_EXT_REND_HANDLE hMasaExtRend, Word16 to_fix );
 
 static ivas_error renderSbaToMultiBinauralCldfb( input_sba *sbaInput, Word32 Cldfb_Out_Real[][CLDFB_NO_COL_MAX][CLDFB_NO_CHANNELS_MAX], Word32 Cldfb_Out_Imag[][CLDFB_NO_COL_MAX][CLDFB_NO_CHANNELS_MAX], const Word16 low_res_pre_rend_rot, const Word16 num_subframes, const Word16 Q_in );
-
+#ifdef FIX_1843_IO_QFACTOR_INIT
+static ivas_error renderSbaToMultiBinaural( input_sba *sbaInput, const AUDIO_CONFIG outConfig, Word32 out[][L_FRAME48k], const Word16 *pq_fact );
+#else
 static ivas_error renderSbaToMultiBinaural( input_sba *sbaInput, const AUDIO_CONFIG outConfig, Word32 out[][L_FRAME48k] );
+#endif
 
 
 /*-------------------------------------------------------------------*
@@ -6080,6 +6083,9 @@ static ivas_error renderIsmToBinauralRoom(
 
     move16();
 
+#ifdef FIX_1843_IO_QFACTOR_INIT
+    *ismInput->crendWrapper->p_io_qfactor = *exp;
+#endif
     /* render 7_1_4 with BRIRs */
     IF( NE_32( ( error = ivas_rend_crendProcessSubframe( ismInput->crendWrapper, IVAS_AUDIO_CONFIG_7_1_4, IVAS_AUDIO_CONFIG_BINAURAL_ROOM_IR, NULL, NULL, NULL, NULL, NULL, p_tmpRendBuffer, p_tmpRendBuffer, ismInput->base.inputBuffer.config.numSamplesPerChannel, *ismInput->base.ctx.pOutSampleRate, 0 ) ), IVAS_ERR_OK ) )
     {
@@ -6820,6 +6826,9 @@ static ivas_error renderMcToBinaural(
         CREND_HANDLE hCrend;
         hCrend = mcInput->crendWrapper->hCrend[0];
 
+#ifdef FIX_1843_IO_QFACTOR_INIT
+        *mcInput->crendWrapper->p_io_qfactor = exp;
+#endif
         /* call CREND */
         IF( NE_32( ( error = ivas_rend_crendProcessSubframe( mcInput->crendWrapper, mcInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, NULL, p_tmpRendBuffer_fx, p_tmpRendBuffer_fx, mcInput->base.inputBuffer.config.numSamplesPerChannel, *mcInput->base.ctx.pOutSampleRate, 0 ) ), IVAS_ERR_OK ) )
         {
@@ -6941,6 +6950,9 @@ static ivas_error renderMcToBinauralRoom(
         CREND_HANDLE hCrend;
         hCrend = mcInput->crendWrapper->hCrend[0];
 
+#ifdef FIX_1843_IO_QFACTOR_INIT
+        *mcInput->crendWrapper->p_io_qfactor = exp;
+#endif
         /* call CREND */
         IF( NE_32( ( error = ivas_rend_crendProcessSubframe( mcInput->crendWrapper, mcInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, NULL, p_tmpRendBuffer, p_tmpRendBuffer, mcInput->base.inputBuffer.config.numSamplesPerChannel, *mcInput->base.ctx.pOutSampleRate, 0 ) ), IVAS_ERR_OK ) )
         {
@@ -7053,6 +7065,9 @@ static ivas_error renderMcCustomLsToBinauralRoom(
     CREND_HANDLE hCrend;
     hCrend = mcInput->crendWrapper->hCrend[0];
 
+#ifdef FIX_1843_IO_QFACTOR_INIT
+    *mcInput->crendWrapper->p_io_qfactor = exp;
+#endif
     /* call CREND */
     IF( NE_32( ( error = ivas_rend_crendProcessSubframe( mcInput->crendWrapper, IVAS_AUDIO_CONFIG_7_1_4, outConfig, NULL, NULL, NULL, NULL, NULL, p_tmpCrendBuffer, p_tmpCrendBuffer, mcInput->base.inputBuffer.config.numSamplesPerChannel, *mcInput->base.ctx.pOutSampleRate, 0 ) ), IVAS_ERR_OK ) )
     {
@@ -7292,6 +7307,9 @@ static ivas_error renderMcToSplitBinaural(
 
             copyBufferTo2dArray_fx( tmpRotBuffer, tmpRendBuffer );
 
+#ifdef FIX_1843_IO_QFACTOR_INIT
+            *mcInput->crendWrapper->p_io_qfactor = exp;
+#endif
             /* call CREND (rotation already performed) */
             IF( NE_32( ( error = ivas_rend_crendProcessSubframe( mcInput->crendWrapper, mcInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, NULL, p_tmpRendBuffer, p_tmpRendBuffer, mcInput->base.inputBuffer.config.numSamplesPerChannel, *mcInput->base.ctx.pOutSampleRate, pos_idx ) ), IVAS_ERR_OK ) )
             {
@@ -7475,7 +7493,12 @@ static void renderSbaToSba(
 static ivas_error renderSbaToMultiBinaural(
     input_sba *sbaInput,
     const AUDIO_CONFIG outConfig,
+#ifdef FIX_1843_IO_QFACTOR_INIT
+    Word32 out[][L_FRAME48k],
+    const Word16 *pq_fact )
+#else
     Word32 out[][L_FRAME48k] )
+#endif
 {
     Word32 tmpCrendBuffer[MAX_OUTPUT_CHANNELS][L_FRAME48k];
     Word32 *p_tmpCrendBuffer[MAX_OUTPUT_CHANNELS];
@@ -7560,6 +7583,9 @@ static ivas_error renderSbaToMultiBinaural(
 
         assert( sbaInput->crendWrapper->hCrend[0]->hReverb == NULL );
 
+#ifdef FIX_1843_IO_QFACTOR_INIT
+        *sbaInput->crendWrapper->p_io_qfactor = *pq_fact;
+#endif
         /* call CREND */
         IF( NE_32( ( error = ivas_rend_crendProcessSubframe( sbaInput->crendWrapper, sbaInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, NULL, p_tmpCrendBuffer, p_tmpCrendBuffer, sbaInput->base.inputBuffer.config.numSamplesPerChannel, *sbaInput->base.ctx.pOutSampleRate, pos_idx ) ), IVAS_ERR_OK ) )
         {
@@ -7632,7 +7658,11 @@ static ivas_error renderSbaToSplitBinaural(
     }
     else
     {
+#ifdef FIX_1843_IO_QFACTOR_INIT
+        IF( ( error = renderSbaToMultiBinaural( sbaInput, outConfig, tmpCrendBuffer, outAudio.pq_fact ) ) != IVAS_ERR_OK )
+#else
         IF( ( error = renderSbaToMultiBinaural( sbaInput, outConfig, tmpCrendBuffer ) ) != IVAS_ERR_OK )
+#endif
         {
             return error;
         }
@@ -7731,6 +7761,9 @@ static ivas_error renderSbaToBinaural(
         CREND_HANDLE hCrend;
         hCrend = sbaInput->crendWrapper->hCrend[0];
 
+#ifdef FIX_1843_IO_QFACTOR_INIT
+        *sbaInput->crendWrapper->p_io_qfactor = *outAudio.pq_fact;
+#endif
         /* call CREND */
         IF( NE_32( ( error = ivas_rend_crendProcessSubframe( sbaInput->crendWrapper, sbaInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, NULL, output_fx, output_fx, sbaInput->base.inputBuffer.config.numSamplesPerChannel, *sbaInput->base.ctx.pOutSampleRate, 0 ) ), IVAS_ERR_OK ) )
         {
@@ -7843,6 +7876,9 @@ static ivas_error renderSbaToBinauralRoom(
     }
     copyBufferTo2dArray_fx( tmpMcBuffer, tmpCrendBuffer );
 
+#ifdef FIX_1843_IO_QFACTOR_INIT
+    *sbaInput->crendWrapper->p_io_qfactor = *outAudio.pq_fact;
+#endif
     /* call CREND */
     IF( NE_32( ( error = ivas_rend_crendProcessSubframe( sbaInput->crendWrapper, IVAS_AUDIO_CONFIG_7_1_4, outConfig, NULL, NULL, NULL, NULL, NULL, p_tmpCrendBuffer, p_tmpCrendBuffer, sbaInput->base.inputBuffer.config.numSamplesPerChannel, *sbaInput->base.ctx.pOutSampleRate, 0 ) ), IVAS_ERR_OK ) )
     {