hey just need some help working out what happened to my DB's! i had a round tune port and got 139.1db then changed the port to a rectangle one and now im gettin 135.9db!
measured both ports just so you's can get an idea on what changed!
(OLD PORT 139.1db) round port is 8 inches round 15 inches long!
(NEW PORT 135.9db) rectangle port is 15 inches high, 3 inches wide, 8 inches long!