diff --git a/lib_com/options.h b/lib_com/options.h
index fa7c6f8ca7ca8467851c5a0363715cd63ecd3105..6d4d3536197b74ad0cb24fdee6e28bf2e30ba6f4 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -126,6 +126,7 @@
 #define NONBE_FIX_1012_1013_JBM_FLUSH_BUFFER                  /* FhG: issues #1012, 1013: JBM flush function uses wrong output buffer */
 #define FIX_998_UNUSED_FUNCTION                         /* FhG: issue 998: delete unused funtion ivas_dirac_dec_get_response_split_order */ 
 #define NONBE_FIX_1014_1015_1016_OSBA_JBM_STEREO              /* FhG: issues #1014, #1015, #1016: fix tc buffer info update in the discrete ism renderer */
+#define NONBE_FIX_987_PARAMC_BINAURAL_REVERB_RENDERING       /* FhG: issue 987: solution b: downmix HOA3 to stereo a input for the reverberator */
 
 /* #################### End BASOP porting switches ############################ */
 
diff --git a/lib_dec/ivas_binRenderer_internal_fx.c b/lib_dec/ivas_binRenderer_internal_fx.c
index b37b9bd6d94817571e215742ddd9f5b4c2fa4779..75b746ae7653afb7e7ea57ce2a6130fc114572ab 100644
--- a/lib_dec/ivas_binRenderer_internal_fx.c
+++ b/lib_dec/ivas_binRenderer_internal_fx.c
@@ -1015,28 +1015,54 @@ static void ivas_binaural_obtain_DMX_fx(
             set32_fx( outRealRightPtr_fx, 0, CLDFB_NO_CHANNELS_MAX );
             set32_fx( outImagRightPtr_fx, 0, CLDFB_NO_CHANNELS_MAX );
 
-            FOR( chIdx = 0; chIdx < hBinRenderer->nInChannels; chIdx++ )
+#ifdef NONBE_FIX_987_PARAMC_BINAURAL_REVERB_RENDERING
+            /*Ambisonics input requires different processing*/
+            if ( EQ_16( hBinRenderer->nInChannels, HOA3_CHANNELS ) )
             {
-                Word32 foa_const_fx = L_shl( hBinRenderer->hReverb->foa_enc_fx[chIdx][1], 1 ); // Q30
-                Word32 one_add_foa_const, one_sub_foa_const;
+                Word32 *inRealPtr_W, *inImagPtr_W;
+                Word32 *inRealPtr_Y, *inImagPtr_Y;
 
-                one_add_foa_const = L_add( ONE_IN_Q30, foa_const_fx );     // Q30
-                one_sub_foa_const = L_sub_sat( ONE_IN_Q30, foa_const_fx ); // Q30
+                inRealPtr_W = (Word32 *) &( RealBuffer[0][k][0] );
+                inImagPtr_W = (Word32 *) &( ImagBuffer[0][k][0] );
 
-                inRealPtr_fx = (Word32 *) &( RealBuffer[chIdx][k][0] );
-                inImagPtr_fx = (Word32 *) &( ImagBuffer[chIdx][k][0] );
+                inRealPtr_Y = (Word32 *) &( RealBuffer[1][k][0] );
+                inImagPtr_Y = (Word32 *) &( ImagBuffer[1][k][0] );
 
                 FOR( bandIdx = 0; bandIdx < hBinRenderer->conv_band; bandIdx++ )
                 {
-                    outRealLeftPtr_fx[bandIdx] = L_add( outRealLeftPtr_fx[bandIdx], Mpy_32_32( inRealPtr_fx[bandIdx], one_add_foa_const ) ); // Q_in - 1
-                    move32();
-                    outImagLeftPtr_fx[bandIdx] = L_add( outImagLeftPtr_fx[bandIdx], Mpy_32_32( inImagPtr_fx[bandIdx], one_add_foa_const ) ); // Q_in - 1
-                    move32();
+                    outRealLeftPtr_fx[bandIdx] = L_add( inRealPtr_W[bandIdx], inRealPtr_Y[bandIdx] );
+                    outImagLeftPtr_fx[bandIdx] = L_add( inImagPtr_W[bandIdx], inImagPtr_Y[bandIdx] );
 
-                    outRealRightPtr_fx[bandIdx] = L_add( outRealRightPtr_fx[bandIdx], Mpy_32_32( inRealPtr_fx[bandIdx], one_sub_foa_const ) ); // Q_in - 1
-                    move32();
-                    outImagRightPtr_fx[bandIdx] = L_add( outImagRightPtr_fx[bandIdx], Mpy_32_32( inImagPtr_fx[bandIdx], one_sub_foa_const ) ); // Q_in - 1
-                    move32();
+                    outRealRightPtr_fx[bandIdx] = L_sub( inRealPtr_W[bandIdx], inRealPtr_Y[bandIdx] );
+                    outImagRightPtr_fx[bandIdx] = L_sub( inImagPtr_W[bandIdx], inImagPtr_Y[bandIdx] );
+                }
+            }
+            else
+#endif
+            {
+                FOR( chIdx = 0; chIdx < hBinRenderer->nInChannels; chIdx++ )
+                {
+                    Word32 foa_const_fx = L_shl( hBinRenderer->hReverb->foa_enc_fx[chIdx][1], 1 ); // Q30
+                    Word32 one_add_foa_const, one_sub_foa_const;
+
+                    one_add_foa_const = L_add( ONE_IN_Q30, foa_const_fx );     // Q30
+                    one_sub_foa_const = L_sub_sat( ONE_IN_Q30, foa_const_fx ); // Q30
+
+                    inRealPtr_fx = (Word32 *) &( RealBuffer[chIdx][k][0] );
+                    inImagPtr_fx = (Word32 *) &( ImagBuffer[chIdx][k][0] );
+
+                    FOR( bandIdx = 0; bandIdx < hBinRenderer->conv_band; bandIdx++ )
+                    {
+                        outRealLeftPtr_fx[bandIdx] = L_add( outRealLeftPtr_fx[bandIdx], Mpy_32_32( inRealPtr_fx[bandIdx], one_add_foa_const ) ); // Q_in - 1
+                        move32();
+                        outImagLeftPtr_fx[bandIdx] = L_add( outImagLeftPtr_fx[bandIdx], Mpy_32_32( inImagPtr_fx[bandIdx], one_add_foa_const ) ); // Q_in - 1
+                        move32();
+
+                        outRealRightPtr_fx[bandIdx] = L_add( outRealRightPtr_fx[bandIdx], Mpy_32_32( inRealPtr_fx[bandIdx], one_sub_foa_const ) ); // Q_in - 1
+                        move32();
+                        outImagRightPtr_fx[bandIdx] = L_add( outImagRightPtr_fx[bandIdx], Mpy_32_32( inImagPtr_fx[bandIdx], one_sub_foa_const ) ); // Q_in - 1
+                        move32();
+                    }
                 }
             }
         }
@@ -1368,8 +1394,15 @@ ivas_error ivas_binRenderer_open_fx(
     {
         test();
         test();
-        /* NOTE to future self by @kiene: this should have been changed by NONBE_FIX_1058_DECODER_ERROR_WITH_REVERB_ROOM, but the BASOP repo code is not at that point yet, so not change needed here */
+#ifdef NONBE_FIX_1058_DECODER_ERROR_WITH_REVERB_ROOM
+        IF( hBinRenderer->hInputSetup->is_loudspeaker_setup == 0 )
+#else
+#ifdef NONBE_FIX_987_PARAMC_BINAURAL_REVERB_RENDERING
+        IF( hBinRenderer->hInputSetup->is_loudspeaker_setup == 0 && NE_16( hBinRenderer->nInChannels, HOA3_CHANNELS ) )
+#else
         IF( hBinRenderer->hInputSetup->is_loudspeaker_setup == 0 )
+#endif
+#endif
         {
             FOR( k = 0; k < 11; k++ )
             {