THE L7S MIGHT BE LOUDER BUT THE BTL'S ARE WAYYYYYYYYYYYYYYYYYYYYY LOUD. I HAD THE L7S AND THE BTL'S, AND I WOULD GET THE BTL'S ANY DAY. THEY CAN BE RE BUILT UNLIKE THE L7'S, AND THE BTLS CAN HOLD WAY MORE POWER THAN L7'S SO MIGHT WANT TO GO WITH THE BTL'S. THE ONLY DIFFERNCE IS CONE AREA.