Is it the loaded sub? The self amped versions being weak? Is it the enclosure itself? The reason I wonder is because it seems like the tube design would be perfect for me as I plan on removing it from time to time and for times I dont feel like messing with it would be fairly lightweight as far as enclosures go. Just wondering if I could get one and replace it with a good quality sub, zap it with good clean power and be happy with it?