A:Answer Hi Marty,
Make sure that the HW-A450 is on the latest firmware update (ver. 1015) using a USB device.
https://www.samsung.com/us/support/downloads/?model=N0054639&modelCode=HW-A450/ZA
You can also try optimizing audio performance for your specific content by pressing the SOUND MODE button on your soundbar remote, and then selecting the desired sound effect by choosing STANDARD, SURROUND SOUND, BASS BOOST, GAME, or ADAPTIVE.
^Andrew