I've ran 2 HCCA 15's in my ESV for about a year,ported ..2 MTX 81000D's runnin them... Not many people could sit in there with it UP!! I prefer sealed enclosures,but runnin ported,the HCCA's hit the lower notes better than any other sub i heard in a ported box.... A lil pricey,but i like'em!!