diff --git a/libraries/dsp/filter/src/vhdl/fil_ppf_wide.vhd b/libraries/dsp/filter/src/vhdl/fil_ppf_wide.vhd
index d2880b09aa690ad1da33f6e1ffff44a3b7a3c303..85bdf3c3fcb3d18d31085a6a22789935a2a87a1f 100644
--- a/libraries/dsp/filter/src/vhdl/fil_ppf_wide.vhd
+++ b/libraries/dsp/filter/src/vhdl/fil_ppf_wide.vhd
@@ -235,7 +235,7 @@ begin
     generic map (
       g_fil_ppf           => c_fil_ppf_arr(P),
       g_fil_ppf_pipeline  => g_fil_ppf_pipeline,
-      g_file_index_arr    => c_file_index_arr2(P),
+      g_file_index_arr    => c_file_index_arr2(P),  -- use (g_fil_ppf.wb_factor-1 - P) to try impact of reversed WB FIR coefficients
       g_coefs_file_prefix => g_coefs_file_prefix 
     )
     port map (