Hello all, I have a DIY speaker. It's an MTM design. I'd like to identify the brand of the woofer. It's a 5 1/4" driver. Specs say it's made of Neoflex. But the most interesting thing is the woofer's dustcap. It has a logo engraved on it. The logo looks like a spiral. Any ideas? I'd think that logo is the key - though I don't have a clue as to what brand may it be. Thanks a lot for any help!