My trusty 10" driver REL Q150E sounds amazing (with Silverline Prelude mains) from a 1 foot sealed square box, verifying that they (REL) know what they're doing. I mean really...I also have couple of pro bass rigs with various cabinets: An Eden 15 ported, Eden 2X10 (the larger one with tuning vents on top and bottom), and an Eden 12 combo ported. Of all these the 2X10 cab goes lowest in frequency, and sounds amazing stacked on top of the 15. I can get the 12 combo to sound very similar albeit at lower levels. Don't know if this helps the topic, but at least it gave me a chance to talk about my bass stuff and use the word "albeit."