Any device with AC3 pass-through will behave this way, no matter if it's a Blu-ray player, Set-Top-Box, whatever.
Two ways to avoid it:
1. Enable "Stereo downmix" for Dolby Digital/AC3. This will ruin the 5.1/7.1 experience to stereo, but will allow to control volume on the box.
Or
2. Push volume on the box to the max. That way, stereo and AC3 will have about the same volume on the A/V receiver (or screambar or the trashy foil speakers inside todays flat TVs).
Then, use the A/V receiver (screambar, TV, ...) volume controls ONLY.
Decent remote controls (Logitech Harmony) or HDMI-CEC (Crappy Electrical Cooperation) will allow to have the STB remote to control the A/V receiver (...) volume instead of the STB volume.
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