It could be the difference between Dolby Digital sound on the HD channel and ordinary stereo on the SD channels. On my Humax HDR adjusting the HDR's volume only affects the SD sound, it has no effect on the HD sound. If your Bush has a volume control set it to maximum and adjust the TV volume only.
However, even doing that I still find that the HD sound is just that bit louder though. It's just something I have to live with.
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