DO NOT USE AN ALR SCREEN!!!! I am not sure how this EVER comes to be in a proper home theater. ALR screens are a band aid solution for a really crappy room. ALR screens significantly damage the image coming out of a projector. Sparklies, hot spots, and poor image uniformity are the MAJOR issues of these screens. So, unless your room is absolute garbage, you do NOT use an ALR screen ever. If you call a place like Stewart and let them know you have a good theater space, they let you know to use a white screen. And at 150" you will want one with a small bit of positive gain, but not enough gain as to create hot spots or sparklies. If you haven't seen sparklies before, it is literally what it sounds like. It is a visible 'sparkle' to certain areas of the screen as the underlying reflective coating creates pin points of brighter spots that are reflected back towards a viewers eyes. This is a major issue with ALR screens because of the optical coating used. Not so much with other screens, but some grey screens with a slight positive gain can have this issue and higher gain white screens (1.5 gain or higher) often have this issue.
I would not worry too much about the bass presenting as an issue to the screen. Not sure how much space is between the screen and the surface of the subwoofer... still, I've never seen this as an issue in any installations I've done over the years.