We have Sony Bravia LCD and Philips DVD player - DVP3146. When we watch TV, we set the volume in the range of 25 - 30 and it is comfortable listening, but when we connect DVD player and play any DVD, then the volume has to be set in the range of 65 -70. (some times even higher to 85-90) Please advise on what is the cause and how to set DVD player volume? It happens with all the DVD's.