diff --git a/ivas_processing_scripts/audiotools/audiofile.py b/ivas_processing_scripts/audiotools/audiofile.py
index f8fad48f4e2e0e899e815a3cda65544ef84bef39..a3c84e7eb98adae913f33e4201d96c1ff3020bf8 100755
--- a/ivas_processing_scripts/audiotools/audiofile.py
+++ b/ivas_processing_scripts/audiotools/audiofile.py
@@ -153,6 +153,7 @@ def concat(
     silence_pre: int,
     silence_post: int,
     in_fs: Optional[int] = 48000,
+    num_channels: Optional[int] = None,
     pad_noise: Optional[bool] = False,
     preamble: Optional[int] = None,
     pad_noise_preamble: Optional[bool] = False,
@@ -189,7 +190,7 @@ def concat(
 
     # Read input files
     for in_file in in_filenames:
-        x, fs = read(in_file, fs=in_fs)
+        x, fs = read(in_file, fs=in_fs, nchannels=num_channels)
         if fs_compare and fs_compare != fs:
             raise ValueError("Sampling rates of files to concatenate don't match")
         else:
diff --git a/ivas_processing_scripts/processing/processing.py b/ivas_processing_scripts/processing/processing.py
index 76e25fe7cb70d7f061c53e3a888b208c3a36fe6f..e755a325e515668db576f4548c8554f2f1c32d16 100755
--- a/ivas_processing_scripts/processing/processing.py
+++ b/ivas_processing_scripts/processing/processing.py
@@ -38,6 +38,7 @@ from shutil import copyfile
 from typing import Iterable, Union
 from warnings import warn
 
+from ivas_processing_scripts.audiotools import audio
 from ivas_processing_scripts.audiotools.audiofile import concat, split
 from ivas_processing_scripts.audiotools.metadata import (
     concat_meta_from_file,
@@ -108,12 +109,21 @@ def concat_setup(cfg: TestConfig, logger: logging.Logger):
         f"{cfg.input_path.name}_concatenated.wav"
     )
 
+    # determine number of channels for pcm and raw files
+    if hasattr(cfg, "preprocessing"):
+        tmp_in_fmt = cfg.preprocessing.get("fmt", cfg.input["fmt"])
+    else:
+        tmp_in_fmt = cfg.input["fmt"]
+    tmp_audio = audio.fromtype(tmp_in_fmt)
+    tmp_num_chans = tmp_audio.num_channels
+
     cfg.splits = concat(
         cfg.items_list,
         cfg.concat_file,
         cfg.concat_silence.get("pre", 0),
         cfg.concat_silence.get("post", 0),
-        cfg.input.get("fs", 48000),
+        in_fs=cfg.input.get("fs", 48000),
+        num_channels=tmp_num_chans,
         preamble=cfg.preamble,
         pad_noise_preamble=cfg.pad_noise_preamble,
     )
diff --git a/ivas_processing_scripts/utils.py b/ivas_processing_scripts/utils.py
index f28dd79f5f91362c5ca7254400d9301519645714..f271ec76170c67f86fe9e926dba7cd9aa17f273f 100755
--- a/ivas_processing_scripts/utils.py
+++ b/ivas_processing_scripts/utils.py
@@ -41,7 +41,7 @@ from pathlib import Path
 from shutil import which
 from typing import Callable, Iterable, Optional, Union
 
-ALLOWED_INPUT_EXT = (".wav", ".pcm", ".txt")
+ALLOWED_INPUT_EXT = (".wav", ".pcm", ".txt", ".raw")
 BIN_DIR = Path(__file__).parent.joinpath("bin")