I disconnected it long enough to pull it down and get the model number.
Thinking it was a lost cause, I decided to find out if I could get replacement parts. I went to the Infinity site and finally got into their support website (you get no support without the model number) and filled out an email form asking about the part.
Yesterday, I got a nice email from "Sharon" giving me the part number and a phone number to call to order the part. The $50 part is on the way which saves me at least $25 (to replace the speaker) or $100 because I'd need a matched set.
Let's see... That was the bad and the good... Now for the odd.
Infinity was purchased by Harman International (I knew this because it was on their site). While I was on hold, I was listening to a boomy bass voice saying "Thank you for calling JBL" (JBL was always known for their big bass). I finally discovered that JBL was also purchased by Harman International. One big happy family.