Most of my bass drums are unported. I use an Evans EMAD and a single ply head on the front. I tried the various pillows and hated the way they made the bass drums sound, so I went back to the good old felt strip under the front head, which gives me enough muffling to keep the leader happy and gives me a little resonance and a definite note, instead of a dead thud that sounds like a cardboard box. .
I bumped into a drummer I know who also has a sound company. He did sound for us on a municipal concert last summer, and mentioned that he had a hard time miking my unported bass drum that night. He said it was the first time he'd ever worked with a drummer who didn't have a ported head. I found that hard to believe, but whatever.
As he's a nice guy, I told him in a gentle way that I'm sure he could figure out how to EQ an unported head if he tried. Actually, I'm afraid he probably won't.