Did you try another cable?
I bought a Toshiba 37" LCD HDTV Model 37E200U and a Toshiba Blu-Ray player Model BDX2500KU and connected with HDMI. The sound with TV only is fine but when playing a DVD I have to turn the sound all the way up (goes to 62) and it's still hard to hear some of the dialogue. I have tried every different audio setting via the menu on both TV and DVD. I have tried different HDMI ports on TV. I then even tried a different brand of Blu-Ray player and it was the same. I am stumped. Please help or I will have to return the whole thing. Not interested in audio system as this is a rental property.