bump for these bad boys. i can personally say these 10 subs work flawlessly and get LOUD. i took these out of my 159.9 bassrace van. best bassrace score i did with 12 of these off 8 memphis 4kws was a 161.1. these subs can take a beating and keep on ticking. i have a few buddies that run these daily off 4kw each. these subs play nasty loud around 30hz if you build the box properly. u will have spider failure before u would ever bottom these things out.