Where's the Bass? No bottom end with Dolby TrueHD?

[denguy]

I've got a Yamaha RX-V3900 amp with a Sony BDSP-550 blu-ray player using HDMI video/audio connections and a 7.1 home theater setup with a quality Velodyne sub. I'm finding wild inconsistencies in the low frequency output of blu-ray discs:

1. PCM rocks. Full surround soundfield plus room shaking low end. Example: Fifth Element.

2. DTS 5.1 HD rocks. Full surround soundfield plus earth shaking low end. Example: Chronicles of Riddick; Fantastic 4 Silver Surfer.

3. Dobly Digital 5.1 and Dolby TrueHD are hit and miss and can really suck. The Dark Knight and Bladerunner are great. But on other discs, I have to jack the volume and still NO FREAKIN' LOW END. Examples: Transformers, Fifth Element (using the Dolby TrueHD track) and especially Terminator 3. T3 makes me want to break the blu-ray disc into tiny little pieces and mail it back to Warner Bros. I read the reviews on this site and others claiming high impact sound with bottom end impact, but I'm not hearing it at all.

Can somebody help me figure out what the deal is with these discs? I've got the dynamic range control set to "OFF" on my receiver so that's not affecting the audio input. Why shouldn't I break my T3 disc in half?