Rogersound Labs was the first company I heard that had a subwoofer back in 1974.
I have a pair of their 10S Speedwoofers and they pair really nice with my towers. I gave the 10S Speedwoofers a try first due to having transmission line design to go lower in a musical fashion.
The 12S Speedwoofer has come out and it is very highly thought of. They are a company that will let you try them out and pay the freight to return [at least they did when I was delivered my pair of 10S]. I didn't send them back.
