diff --git a/lib_com/options.h b/lib_com/options.h
index ffba312fbb903318f2c461cc6156f324947c76bb..bfc16fcaab0781d2ff98c6cb2daa7db0a9eed4e6 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -159,14 +159,13 @@
 #define SPLIT_REND_POSE_CORRECTION_UNUSED_BITS
 
 #define FIX_NUM_SUBFRAME_UPDATE
-
 #define FIX_1053_REVERB_RECONFIGURATION                 /* Philips: issue 1053: fix for dynamic switching of acoustic environment */
-
 #define CONF_DISTATT                                    /* Eri: Make distance attenuation configurable */
 #define FIX_1082_INSTRUM_FAILED_LC3PLUS                 /* VoiceAge: issue 1082: fix ambiguous syntax in LC3Plus code leading to fails of instrumented builds */
-
 #define FIX_1077_MEMORY_TEST_MISSING                    /* orange: issue 1077 : add missing memory test*/
 #define FIX_1081_BINAURAL_SPLIT_PCM_SANITY_CHECK        /* VA: issue 1081: correct error print-out when BINAURAL_SPLIT_PCM is requested */
+#define FIX_1052_EXT_OUTPUT                             /* VA: issue 1052: define EXT decoder output configuration for stereo and MC formats */ 
+
 
 /* #################### End BE switches ################################## */
 
@@ -176,7 +175,6 @@
 
 #define NONBE_FIX_ISM_XOVER_BR                          /* FhG: issue 1072: select OSBA coding method depending on number of object and bitrate */
 #define NONBE_FIX_1028_1DB_TCX_LEVEL_DROP               /* VA: Harmonize the logic setting LP weighting factor between TCX encoder and TCX decoder */
-
 #define NONBE_FIX_SBA_SIGNALING_BITS_B                  /* FhG: issue 1061: option B: signal sba order additionally in OSBA */
 #define NONBE_FIX_MC_LFE_LPF                            /* Dlb: Adding the LFE LPF filter back for MC content. */
 
diff --git a/lib_dec/ivas_init_dec.c b/lib_dec/ivas_init_dec.c
index c8321447dce482fa4d48bfee072dd48572be9ad1..0ed2f388da00157b5259ff34cbe5bb48cb082ea8 100644
--- a/lib_dec/ivas_init_dec.c
+++ b/lib_dec/ivas_init_dec.c
@@ -1154,7 +1154,19 @@ ivas_error ivas_init_decoder(
 
     if ( output_config == IVAS_AUDIO_CONFIG_EXTERNAL )
     {
+#ifdef FIX_1052_EXT_OUTPUT
+        if ( st_ivas->ivas_format == STEREO_FORMAT )
+        {
+            hDecoderConfig->nchan_out = CPE_CHANNELS;
+        }
+        else if ( st_ivas->ivas_format == MC_FORMAT )
+        {
+            hDecoderConfig->nchan_out = audioCfg2channels( st_ivas->transport_config );
+        }
+        else if ( st_ivas->ivas_format == SBA_ISM_FORMAT )
+#else
         if ( st_ivas->ivas_format == SBA_ISM_FORMAT )
+#endif
         {
             hDecoderConfig->nchan_out = audioCfg2channels( IVAS_AUDIO_CONFIG_HOA3 );
             hDecoderConfig->nchan_out += st_ivas->nchan_ism;
@@ -1177,7 +1189,19 @@ ivas_error ivas_init_decoder(
 
     st_ivas->intern_config = output_config;
 
+#ifdef FIX_1052_EXT_OUTPUT
+    if ( output_config == IVAS_AUDIO_CONFIG_EXTERNAL && st_ivas->ivas_format == MC_FORMAT )
+    {
+        ivas_output_init( &( st_ivas->hOutSetup ), st_ivas->transport_config );
+        st_ivas->intern_config = st_ivas->transport_config;
+    }
+    else
+    {
+        ivas_output_init( &( st_ivas->hOutSetup ), output_config );
+    }
+#else
     ivas_output_init( &( st_ivas->hOutSetup ), output_config );
+#endif
 
     if ( st_ivas->ivas_format == SBA_ISM_FORMAT && output_config == IVAS_AUDIO_CONFIG_BINAURAL_ROOM_IR )
     {
@@ -3138,11 +3162,25 @@ static ivas_error doSanityChecks_IVAS(
     /* Verify stereo output configuration */
     if ( st_ivas->ivas_format == STEREO_FORMAT )
     {
+#ifdef FIX_1052_EXT_OUTPUT
+        if ( output_config != IVAS_AUDIO_CONFIG_MONO && output_config != IVAS_AUDIO_CONFIG_STEREO && output_config != IVAS_AUDIO_CONFIG_5_1 && output_config != IVAS_AUDIO_CONFIG_7_1 && output_config != IVAS_AUDIO_CONFIG_5_1_2 && output_config != IVAS_AUDIO_CONFIG_5_1_4 && output_config != IVAS_AUDIO_CONFIG_7_1_4 && output_config != IVAS_AUDIO_CONFIG_LS_CUSTOM && output_config != IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
         if ( output_config != IVAS_AUDIO_CONFIG_MONO && output_config != IVAS_AUDIO_CONFIG_STEREO && output_config != IVAS_AUDIO_CONFIG_5_1 && output_config != IVAS_AUDIO_CONFIG_7_1 && output_config != IVAS_AUDIO_CONFIG_5_1_2 && output_config != IVAS_AUDIO_CONFIG_5_1_4 && output_config != IVAS_AUDIO_CONFIG_7_1_4 && output_config != IVAS_AUDIO_CONFIG_LS_CUSTOM )
+#endif
         {
             return IVAS_ERROR( IVAS_ERR_INVALID_OUTPUT_FORMAT, "Wrong output configuration specified for Stereo!" );
         }
     }
+#ifdef FIX_1052_EXT_OUTPUT
+    /* Verify output configuration for other formats */
+    else
+    {
+        if ( output_config == IVAS_AUDIO_CONFIG_INVALID )
+        {
+            return IVAS_ERROR( IVAS_ERR_INVALID_OUTPUT_FORMAT, "Incorrect output configuration specified!" );
+        }
+    }
+#else
     else if ( st_ivas->ivas_format == ISM_FORMAT )
     {
         /* Verify ISM output configuration */
@@ -3174,6 +3212,7 @@ static ivas_error doSanityChecks_IVAS(
             return IVAS_ERROR( IVAS_ERR_INVALID_OUTPUT_FORMAT, "Incorrect output configuration specified for Multi-channel" );
         }
     }
+#endif
 
 #ifdef SPLIT_REND_WITH_HEAD_ROT
     if ( ( output_config == IVAS_AUDIO_CONFIG_BINAURAL_SPLIT_CODED || output_config == IVAS_AUDIO_CONFIG_BINAURAL_SPLIT_PCM ) && output_Fs != 48000 )
diff --git a/lib_dec/ivas_jbm_dec.c b/lib_dec/ivas_jbm_dec.c
index 3c58b4c658fccc4f578512125d51e0701b8e556f..80522da7350a9d237d154c35d7235933241c48e1 100644
--- a/lib_dec/ivas_jbm_dec.c
+++ b/lib_dec/ivas_jbm_dec.c
@@ -681,7 +681,11 @@ ivas_error ivas_jbm_dec_tc(
                 /* Delay the separated channel to sync with CLDFB delay of the DirAC synthesis, and synthesize the LFE signal. */
                 if ( output_config == IVAS_AUDIO_CONFIG_5_1 || output_config == IVAS_AUDIO_CONFIG_7_1 ||
                      output_config == IVAS_AUDIO_CONFIG_5_1_4 || output_config == IVAS_AUDIO_CONFIG_7_1_4 ||
+#ifdef FIX_1052_EXT_OUTPUT
+                     output_config == IVAS_AUDIO_CONFIG_5_1_2 || ( output_config == IVAS_AUDIO_CONFIG_LS_CUSTOM && st_ivas->hOutSetup.num_lfe > 0 ) || output_config == IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
                      output_config == IVAS_AUDIO_CONFIG_5_1_2 || ( output_config == IVAS_AUDIO_CONFIG_LS_CUSTOM && st_ivas->hOutSetup.num_lfe > 0 ) )
+#endif
                 {
                     ivas_lfe_synth_with_filters( st_ivas->hMasa->hMasaLfeSynth, p_output, output_frame, n, LFE_CHANNEL );
                 }
diff --git a/lib_dec/ivas_masa_dec.c b/lib_dec/ivas_masa_dec.c
index 81d2d2b27addde94c326b3c6cf3fb4089263687a..6584f00c78679914b35c805a1a297429bd7c137f 100644
--- a/lib_dec/ivas_masa_dec.c
+++ b/lib_dec/ivas_masa_dec.c
@@ -397,7 +397,11 @@ ivas_error ivas_masa_decode(
 
         hMasa->config.coherencePresent = !hQMetaData->all_coherence_zero;
 
+#ifdef FIX_1052_EXT_OUTPUT
+        if ( st_ivas->hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_EXTERNAL && ( st_ivas->ivas_format == MASA_FORMAT || st_ivas->ivas_format == MASA_ISM_FORMAT ) )
+#else
         if ( st_ivas->hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_EXTERNAL )
+#endif
         {
             index_16bits( hQMetaData, hMasa->data.sph_grid16 );
         }
@@ -617,7 +621,11 @@ ivas_error ivas_masa_dec_open(
     hMasa->config.joinedSubframes = FALSE;
 
     /* Create spherical grid only for external output */
+#ifdef FIX_1052_EXT_OUTPUT
+    if ( st_ivas->hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_EXTERNAL && ( st_ivas->ivas_format == MASA_FORMAT || st_ivas->ivas_format == MASA_ISM_FORMAT ) )
+#else
     if ( st_ivas->hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_EXTERNAL )
+#endif
     {
         if ( ( hMasa->data.sph_grid16 = (SPHERICAL_GRID_DATA *) malloc( sizeof( SPHERICAL_GRID_DATA ) ) ) == NULL )
         {
@@ -1048,6 +1056,9 @@ static ivas_error init_lfe_synth_data(
          ( output_config == IVAS_AUDIO_CONFIG_5_1 || output_config == IVAS_AUDIO_CONFIG_7_1 ||
            output_config == IVAS_AUDIO_CONFIG_5_1_2 ||
            output_config == IVAS_AUDIO_CONFIG_5_1_4 || output_config == IVAS_AUDIO_CONFIG_7_1_4 ||
+#ifdef FIX_1052_EXT_OUTPUT
+           output_config == IVAS_AUDIO_CONFIG_EXTERNAL ||
+#endif
            output_config == IVAS_AUDIO_CONFIG_FOA || output_config == IVAS_AUDIO_CONFIG_HOA2 ||
            output_config == IVAS_AUDIO_CONFIG_HOA3 ||
            ( output_config == IVAS_AUDIO_CONFIG_LS_CUSTOM && st_ivas->hOutSetup.num_lfe > 0 ) ) )
diff --git a/lib_dec/ivas_mc_param_dec.c b/lib_dec/ivas_mc_param_dec.c
index a863b50d9862b97b026574481e1e1e931bd464b6..5742d41f70787533576fcfe6e5f31201515dbed0 100644
--- a/lib_dec/ivas_mc_param_dec.c
+++ b/lib_dec/ivas_mc_param_dec.c
@@ -148,7 +148,11 @@ ivas_error ivas_param_mc_dec_open(
     hParamMC->hoa_encoder = NULL;
 
     /* determine the synthesis config */
+#ifdef FIX_1052_EXT_OUTPUT
+    if ( st_ivas->renderer_type == RENDERER_SBA_LINEAR_ENC || st_ivas->renderer_type == RENDERER_BINAURAL_FASTCONV || st_ivas->renderer_type == RENDERER_BINAURAL_FASTCONV_ROOM || st_ivas->renderer_type == RENDERER_BINAURAL_OBJECTS_TD || st_ivas->transport_config == output_config || output_config == IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
     if ( st_ivas->renderer_type == RENDERER_SBA_LINEAR_ENC || st_ivas->renderer_type == RENDERER_BINAURAL_FASTCONV || st_ivas->renderer_type == RENDERER_BINAURAL_FASTCONV_ROOM || st_ivas->renderer_type == RENDERER_BINAURAL_OBJECTS_TD || st_ivas->transport_config == output_config )
+#endif
     {
         hParamMC->synthesis_conf = PARAM_MC_SYNTH_DIRECT;
     }
diff --git a/lib_dec/ivas_mct_dec.c b/lib_dec/ivas_mct_dec.c
index 7e8bdb810a72292198543678697f6ab734ca2f91..98d9db716385d2fae0f9ee42b63c3de16550fcf4 100644
--- a/lib_dec/ivas_mct_dec.c
+++ b/lib_dec/ivas_mct_dec.c
@@ -673,6 +673,15 @@ ivas_error ivas_mc_dec_config(
         {
             st_ivas->transport_config = signaled_config;
         }
+#ifdef FIX_1052_EXT_OUTPUT
+        else if ( st_ivas->transport_config != signaled_config )
+        {
+#ifdef DEBUGGING
+            fprintf( stderr, "\nError: Switching of MC configurations is not supported!\n" );
+#endif
+            return IVAS_ERROR( IVAS_ERR_INTERNAL_FATAL, "wrong MC configuration signalled!" );
+        }
+#endif
 
         /* select MC format mode */
         st_ivas->mc_mode = ivas_mc_mode_select( ivas_mc_map_output_config_to_mc_ls_setup( signaled_config ), st_ivas->hDecoderConfig->ivas_total_brate );
@@ -680,7 +689,11 @@ ivas_error ivas_mc_dec_config(
         /* MC format switching */
         if ( st_ivas->ini_frame != 0 )
         {
+#ifdef FIX_1052_EXT_OUTPUT
+            if ( st_ivas->hDecoderConfig->last_ivas_total_brate != st_ivas->hDecoderConfig->ivas_total_brate || last_mc_mode != st_ivas->mc_mode )
+#else
             if ( st_ivas->hDecoderConfig->last_ivas_total_brate != st_ivas->hDecoderConfig->ivas_total_brate || st_ivas->transport_config != signaled_config || last_mc_mode != st_ivas->mc_mode )
+#endif
             {
 #ifdef SPLIT_REND_WITH_HEAD_ROT
                 if ( ( error = ivas_mc_dec_reconfig( st_ivas, nSamplesRendered, pcm_resolution, data ) ) != IVAS_ERR_OK )
diff --git a/lib_dec/ivas_output_config.c b/lib_dec/ivas_output_config.c
index 84672f35832ff0ab11ad98b07f9cfc21e59edc06..a547d96ac06596135212b49a26ae75c0dd2f3d3a 100644
--- a/lib_dec/ivas_output_config.c
+++ b/lib_dec/ivas_output_config.c
@@ -433,7 +433,11 @@ void ivas_renderer_select(
     else if ( st_ivas->ivas_format == MC_FORMAT )
     {
         *internal_config = transport_config;
+#ifdef FIX_1052_EXT_OUTPUT
+        if ( st_ivas->mc_mode == MC_MODE_MCT && *internal_config != output_config && output_config != IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
         if ( st_ivas->mc_mode == MC_MODE_MCT && *internal_config != output_config )
+#endif
         {
             if ( output_config != IVAS_AUDIO_CONFIG_FOA && output_config != IVAS_AUDIO_CONFIG_HOA2 && output_config != IVAS_AUDIO_CONFIG_HOA3 )
             {
@@ -447,7 +451,11 @@ void ivas_renderer_select(
         else if ( st_ivas->mc_mode == MC_MODE_PARAMUPMIX )
         {
             *internal_config = transport_config;
+#ifdef FIX_1052_EXT_OUTPUT
+            if ( *internal_config != output_config && output_config != IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
             if ( *internal_config != output_config )
+#endif
             {
                 if ( output_config != IVAS_AUDIO_CONFIG_FOA && output_config != IVAS_AUDIO_CONFIG_HOA2 && output_config != IVAS_AUDIO_CONFIG_HOA3 )
                 {
@@ -472,7 +480,14 @@ void ivas_renderer_select(
         }
         else if ( st_ivas->mc_mode == MC_MODE_MCMASA )
         {
+#ifdef FIX_1052_EXT_OUTPUT
+            if ( output_config != IVAS_AUDIO_CONFIG_EXTERNAL )
+            {
+                *internal_config = output_config;
+            }
+#else
             *internal_config = output_config;
+#endif
 
             /* No rendering for 1TC to Mono or Stereo and 2TC to Stereo */
             if ( output_config == IVAS_AUDIO_CONFIG_MONO || output_config == IVAS_AUDIO_CONFIG_STEREO )
diff --git a/lib_dec/ivas_spar_decoder.c b/lib_dec/ivas_spar_decoder.c
index 2e0f4ae0eb1b06a1b24d47ae0a3662be960a7024..d04436f59c554ada8761468c06cce0aa7a027588 100644
--- a/lib_dec/ivas_spar_decoder.c
+++ b/lib_dec/ivas_spar_decoder.c
@@ -1565,6 +1565,7 @@ void ivas_spar_dec_upmixer_sf(
     {
         md_idx = hSpar->render_to_md_map[ts + slot_idx_start];
         ivas_spar_get_parameters( hSpar, hDecoderConfig, md_idx, numch_out, numch_in, num_spar_bands, mixer_mat );
+
         if ( ( hDecoderConfig->ivas_total_brate < IVAS_24k4 ) && ( ( hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_HOA2 ) || ( hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_HOA3 ) ) )
         {
             for ( spar_band = 0; spar_band < num_spar_bands; spar_band++ )
diff --git a/lib_rend/ivas_output_init.c b/lib_rend/ivas_output_init.c
index 253dfcde9684df3c5b5708656a642370f3f3d332..81cf8fc884541170b876d396f23d3d0b60a999c5 100644
--- a/lib_rend/ivas_output_init.c
+++ b/lib_rend/ivas_output_init.c
@@ -408,7 +408,11 @@ int16_t ivas_get_nchan_buffers_dec(
         {
             nchan_out_buff = max( nchan_out_buff, st_ivas->hOutSetup.nchan_out_woLFE + st_ivas->hOutSetup.num_lfe );
         }
+#ifdef FIX_1052_EXT_OUTPUT
+        else if ( output_config != IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
         else
+#endif
         {
             nchan_out_buff = max( audioCfg2channels( st_ivas->transport_config ), audioCfg2channels( st_ivas->intern_config ) );
             nchan_out_buff = max( nchan_out_buff, audioCfg2channels( output_config ) );