Again, I am returning for some much needed advice. I need to buy a subwoofer to complete my system. I have been offered an Energy ES-12XL sub for AU$500. The person has had it for 18 months but lives in an apartment and its a 'bit' loud. My problem is, I cant listen to it as its in another state. I know this sub is sealed and not vented and from reading 1 particular review, its apparantly 'crap'. And secondly, I have the option of purchasing a HSU VTF-2 Mk I sub for about AU$750. So firstly, is the Energy ES-12XL crap? secondly, what kind of difference is there between a sealed sub and one that is vented? and thirdly, should I get the HSU VTF-2 Mk I sub instead? Any opinions would be greatly appreciated.