The speaker is blown. You will need to take it out and repair the foam around the edge or replace the speaker. I will almost guarantee you the foam on top of the speaker is broken right next to the black plastic ring that goes aroud the top of the speaker. I repaired mine with Shoe Goo, a flexible adhesive, and it sounds fine now. A replacement speaker from Lexus is over $350.00. There is a good link on this site that talks about getting to the speaker. Search for replacing subwoofer or something like that. You take the back seat out, one or both of the C pillars and the back deck top. You cannot get it out from the trunk. I did this last weekend and should have taken pictures but I didn't. Good Luck.