I could be wrong but I believe most EDM drops down to 20Hz. That said, you'll want to look at more than just how low a sub is listed as going. You'll want to concentrate on its output at that frequency.
For example, a JTR tuned to 10Hz will still pummel you at 20Hz with 120dbls where as a SVS might do 90dbls at 20Hz.
For example, a JTR tuned to 10Hz will still pummel you at 20Hz with 120dbls where as a SVS might do 90dbls at 20Hz.