I was looking at buying another 18" & i was looking at the specs & i noticed all of these subs had almost identical specs especially the Mayhem & BTL. Could anyone shed some light on the diffrences in these subs?
All three are excellent options, all three are made in the USA. They do share some traits, but that does not mean they are the same sub. It is really a win, win, win. The Fi has the option for customization to your needs a bit.