If you want to have big beats then a bd1000 won't cut it for four 15's, try getting maby two bd1000's and alot of componets, because i have 2 15inch kicker XPL's and two 1100 directed audio amps, and one directed 600, MB quart mids-tweets, with a crossover, 2caps, yellow top battery, high output alternator, boosted up remote wire, {so you dont fry it} 2 guage wire, and a **** load of dynomat. This **** is so loud I seriously wear earplugs. Now you have four 15's. My opinion is thats to much unless you are going to car comps, and you would have to get alot of componets to power this sufficintly and alot of money, and beleave me alittle 1000 watt amp isent going to do it unless you want a getto ass system and wreak alot of things in the mean time. Seriously I think you got 4 15's to look cool because obiously you dont have enough power for them, but if you dont beliveme try it and that bd1000 will go into protect mode or be melted to the car, and the subs will blow from underpower.//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif