I'm thinking about a DIY with the plans that Adire have. If I go sealed with a 250 watt plate amp...vs... A bit more money for a passive set up. Is the cost worth it vs say just going sealed with a Tumult? Looks like I could save just a bit under going the Tumult way...anyone with experience in this..I'd appreciate a reply. If I went the Tumult way, would the box be the same as one for the Tempest? Speaking of the Mid Q design..a 122L cabinet. If I went the Tumult way, I suppose I'd probalby need to use the 500 watt plate amp? Thanks in advance for your replies..