I own both a Revel B15 and an SVS SB13 Plus(95% same as SB13 Ultra) and I think they both are very fast. Very musical subs with punch and timing. All I own is horns and both of these subs keep up very well.
I bet a JL Audio F110 and F112 are both very fast.
Bill
I bet a JL Audio F110 and F112 are both very fast.
Bill