Well I just got my first ever pair of 8's today. The American Bass XD 8. First off , I have owned plenty of nice subs and plenty of crap subs. I can usually spot crap a mile away. Upon first inspection I was baffled by the weight of these things. I believe they weigh about 15 pounds each. I didn't have funds to build a box right away so I borrowed a box from another member here. It's .75 cubic feet tuned to 44hz. I have a single sub getting 600 rms from a older zed audio amp. This sucker sounds pretty good and gets hella loud. I honestly would not believe it was a 8" sub in the trunk if I hadn't installed it myself. Right now the sub is still very stiff and needs to be broke in. I will come back to this review once I get the pair installed instead of a single sub. But I will leave on this note. I know there are probably badder 8" subs out there but I have yet to hear one personally. And until I do I will go on record to say these fuckers are little baby bass beasts. With one in the trunk of a '95 Buick Regal I can flex the trunk a little , lift my console lid , and I just noticed on a ride earlier that certain notes were actually flexing my dash causing the head units display to blur a little in my vision. I would highly recommend these subs to anyone who needs bass in a small package and on a small budget. Truly unbelievable output from these things.