I have a Toshiba SD-4700. When I play a DVD-Audio disc in it, it only offers me the option of playing it in DVD-Audio mode or in Dolby Digital 2.0. However, the same disc, when inserted in a regular DVD player, plays back in Dolby Digital 5.1. How can I play DVD-Audio discs in DD 5.1 on the Toshiba? The player does not manage bass in the DVD-Audio mode, and my speakers cannot handle the bass. I want to avoid having to use something like the Outlaw ICBM if possible.