Volume loss converting DSF to Wav with Convolution

[richardpl]

And what are your IR files? The convolve/FiltersM* files?
Usually IRs are provided with their typical gain to be applied to them prior to process further, so no need to use gtype=gn (which might be just pure guessing).
If you know max typical gain of your impulse file, use something like: afir=gtype=none:irgain=X
where X is actual gain of impulse file used in convolution.