File size could be reduced considerably FWIW. Mavimao's sources are 32-bit two-channel mono. Reducing that to 16-bit single-channel mono would cut down on the size quite a bit, and I did this with my encodes. That said, whether to encode mono as one or two channels is open to debate. Technically speaking, single-channel is better, more space-efficient, comes out of the proper center speaker, etc. But on the other hand, some receivers don't know how to upmix single-channel mono to surround, and two-channel mono works better for them. Pick your poison.