The HTC HD2 is pretty loud, but when connecting it via the audio jack to my car stereo it still tops out at significantly lower volume than a CD in the same stereo.
If you have the same problem this cab at XDA-Developers may be the answer. The cab is taken from the Samsung Omnia and is by SRS labs, and ads control over 3DEffect, Boosts Sound, Bass, Treble, Presets and also a significant volume boost.
Download the cab at XDA-Developers here.
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