I’ve not heard Cascades but everyone who has considers them bass monsters. My other suggestion would be something with Fostex biodynamic drivers. The E-Mu Teak is a good option, and Drop just re-released the Fostex TH-X00 line, or at least one member of it. You can go even further by taking that Fostex chassis and putting Lawton chambers on them. I did that to my TH-X00 awhile ago and used Type IV chambers, and OMG the bass! Powerful, full, punchy, so much rumble. That will run you up to close to $1K, though. Enjoy the journey!
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