diff --git a/lib_com/ivas_prot_fx.h b/lib_com/ivas_prot_fx.h
index 3c01bebfdaff4e774ffaea57f69bac6699caedb3..4a72b194a763c56dc8acc1032aa4a62eebbab728 100644
--- a/lib_com/ivas_prot_fx.h
+++ b/lib_com/ivas_prot_fx.h
@@ -2922,7 +2922,7 @@ void stereo_dft_enc_write_BS_fx(
 
 void stereo_dft_enc_res_fx(
     STEREO_DFT_ENC_DATA_HANDLE hStereoDft, /* i/o: encoder stereo handle       */
-    const Word32 *input_8k,                /* i  : input buffer sampled at 8kHz Q16 */
+    const Word32 *input_8k,                /* i  : input buffer sampled at 8kHz Q15 */
     BSTR_ENC_HANDLE hBstr,                 /* i/o: bitstream handle            */
     Word16 *nb_bits,                       /* o  : number of bits written      */
     const Word16 max_bits );
diff --git a/lib_enc/ivas_cpe_enc_fx.c b/lib_enc/ivas_cpe_enc_fx.c
index 8f9a0edf66b56d11820c4e03443dae931e317894..3fd9c2d7a071991e1ef8aac46ab549c4458c254b 100644
--- a/lib_enc/ivas_cpe_enc_fx.c
+++ b/lib_enc/ivas_cpe_enc_fx.c
@@ -1207,7 +1207,7 @@ ivas_error ivas_cpe_enc_fx(
 
             FOR( Word16 i = 0; i < CPE_CHANNELS; i++ )
             {
-                Copy_Scale_sig_16_32_no_sat( old_inp_12k8_16fx[i], old_inp_12k8_fx[i], L_INP_12k8, Q16 + Q1 );
+                Copy_Scale_sig_16_32_no_sat( old_inp_12k8_16fx[i], old_inp_12k8_fx[i], L_INP_12k8, Q16 ); // Q(-1) -> Q15
             }
             stereo_dft_enc_res_fx( hCPE->hStereoDft, old_inp_12k8_fx[1] + L_INP_MEM - STEREO_DFT_OVL_8k, hCPE->hMetaData, &nb_bits, max_bits );
         }
diff --git a/lib_enc/ivas_stereo_dft_enc_fx.c b/lib_enc/ivas_stereo_dft_enc_fx.c
index cf246368fa4f111ab3c0cf6bc7f34f34a4c4a9be..8578a46aef3c4fe7094873fad25242159060a537 100644
--- a/lib_enc/ivas_stereo_dft_enc_fx.c
+++ b/lib_enc/ivas_stereo_dft_enc_fx.c
@@ -2700,7 +2700,7 @@ static void stereo_dft_enc_get_res_cod_mode_flag_fx(
 
 void stereo_dft_enc_res_fx(
     STEREO_DFT_ENC_DATA_HANDLE hStereoDft, /* i/o: encoder stereo handle       */
-    const Word32 *input_8k,                /* i  : input buffer sampled at 8kHz Q16 */
+    const Word32 *input_8k,                /* i  : input buffer sampled at 8kHz Q15 */
     BSTR_ENC_HANDLE hBstr,                 /* i/o: bitstream handle            */
     Word16 *nb_bits,                       /* o  : number of bits written      */
     const Word16 max_bits )
@@ -2745,7 +2745,7 @@ void stereo_dft_enc_res_fx(
 
         /* MDCT analysis */
         // TCX_MDCT_flt( win, MDCT_RES, STEREO_DFT_OVL_8k, L_FRAME8k - STEREO_DFT_OVL_8k, STEREO_DFT_OVL_8k, IVAS_CPE_DFT );
-        MDCT_RES_e = 16;
+        MDCT_RES_e = 17;
         move16();
         TCX_MDCT( win, MDCT_RES, &MDCT_RES_e, STEREO_DFT_OVL_8k, L_FRAME8k - STEREO_DFT_OVL_8k, STEREO_DFT_OVL_8k, IVAS_CPE_DFT );