I just received a PSA s1500 sub to go with my Sierra Towers (w/ RAAL), and after using the REW software to level match the Towers and the sub, it sounds great -- very well balanced. BUT, the only way to get the levels matched is to run the sub at virtually full gain! My prior (and much older) Velodyne sub could be level matched at only about 70% of full gain. They are in the same spot in the room.

Any thoughts on what could be the problem (if it is a problem)?
Thanks for your thoughts.

BTW -- the Sierra Towers sound better each time I listen to them!