I have a pair of brand new Elemental Designs Eu 700, these are 6.5" subs. i was going to plan on putting these on my rear deck in place of the stock 6x9's and use them there. Well i decided not to do that anymore because im tied up on money now and don't have the time for the project. These can be used as "free airspace" subs which means no box is required for these subs. you can put them in a sealed or ported box. These retail for 75 bucks. these subs hit hard, ive heard them before in a box and they can hit harder than 2 12's. i have a link below of them in a box ported. ill let these go for 140 shipped obo.