Velodyne DD15 - worth repairing the plate amp?

jafant If a "REL" is another sub, what REL can I get for $800 that competes well with the DD-15 (in big room setup and/or normal room setup)?

fpomposo I have a hard time envisioning a competitive sub for say the budget to repair/retain the DD-15 ($800). I don't like the complexity (no adj crossover frequency aside from what receiver offers (often only 50Hz; I run B&W Nautilus 804 as 'small' front speakers, so 50Hz is ok but certainly not 80Hz that some receivers have as lowest) and inconvenience (no auto on/off) of running the DD-15 passive with standalone Class D (but have 2 on hand). 

Unfortuantely, I have never had the chance to listen to the DD-15 in current large room setup or even compare to my 18" Dayton drive by LT1300 amp. I probably should close up the Velodyno and run/test with Class D connected to receiver sub out, see how it does. If that is already any good, then I assume together with repaired plate amp and Velonyne control would be even better, and certainly worth the $400 or so repair. 

How does used SVS SB-2000 compare to (repaired) Velodyne DD-15?

@kraftwerkturbo ,

If you are ready to buy a new sub then No, it makes no sense to repair the old one unless you think you can sell it for more than $500. 

The Velodyn is old Tech as are all the SVS and Rel subs. The very best designs use two drivers at opposite ends of the enclosure running in phase. Both cones move out at same time and in at the same time thus their Newtonian forces cancel helping to control resonance. These subs have much less distortion. This is called Balanced Force Design. KEF, Magico, and Martin Logan make balanced force subs. The best unit to replace your Velodyn is the Martin Logan Balance Force 212.

mijostyn interesting but irrelevant in this context. Push pull has been around long before the term balanced force has been coined.