It had power and presence during the opening sequence to Alien and the bass output was good without a subwoofer. Luckily Sevenoakes had it calibrated as it was a big Demo room and it did feel like surround sound. A clever bit of technology the Yamaha as I only have the Panasonic TV with its BBE surround that is ok but not in the same league as Yahama. The proprietor informed me that the smaller version the DSP 900 would need the sub woofer. Hope this helps.