Yer FLI is a VIBE product.
VIBE (vented innovative bass enclosures) just use average subs, in the perfectly tuned box make the sub sound much better than it actally is lol. they have cylinder ports, sqaure ports and bandpass enclosures i think.
ported enclosures are more about SPL (volume) and not really SQ (sound quality) So these VIBE subs are great for volume. but lack punch (to a certain degree) as the sub doesnt have an air cushion in the box to bounce off. in theory if you had the same sub- one in a sealed box, and one in a ported box, the ported one could sound up to TWICE as loud, just because the sub is moving air, and the port is also moving the same amount of air.
VIBE then wanted to cover the SQ area of the market aswel. However, if they just made a sealed box, they couldnt call it VIBE. as the V stands for VENTED... So, along came their new range, FLI.
basically its vibe stuff in a sealed box. The box is sealed to the subs optimum volume, but you wont be getting the volume of VIBE. you will however get better SQ in the form of a more responsive beat. which i think is better anyway lol.
Its still budget stuff, and for the price you cant really go wrong. Especially the ACTIVE range, which has the amp included with the box. So all you need are the wires.