Velodyne DD15 - worth repairing the plate amp?

mofojo Yup:

Option 1: Repair (invest $500), total value $800-$900

Option 2: that is my 2nd option. Actually have two Class D on hand. Connect directly to sub out of receiver. But then do NOT have the Velodyne 'feedback control', and not sure how much that contributes. "invest" $300. 

Option 3: sell DD-15 with defective amp as is (including Velodyne measuring microphone and rest of original acessories kit), going rate $300-400 or so. Replace with 'modern' sub $800 budget. 

oddiofyl I have quote from EBC; they would be the one I sent the amp to for repair if going that route.

Just not sure how good the DD-15 compared to others/modern in used condition and value range. 

asvjerry see 2nd option above, but no feedback control (and no auto on/off, and no crossover control beyond what receiver allows). 

Another plate with sufficient power: probably better to repair the existing for about $400 (shipping, taxes incl). Luckily, those class D are light. 

Converting to passive is super easy. Currently have the plate amp out, found one discolored area that likely is the culprit (incoming power module).

I'd definitely look into fixing it yourself.  Google is your friend.  You'll learn a ton and gain some appreciation for it, save some money, and salvage a worthy older piece from the scrap heap.  Win, win.  Some new subs may be better, but they won't come cheap, and won't be that much better if you set it up well.

asvjerry repair of original is probably cheaper than replacement plate amp of similar power.

Running as passive is super easy. I have plate amp out and found discolored area on incoming power board, likely culprit. 

I am running my Dayton UM18-22 with external plate amp in housing I made. 

External Class D power amp option is missing crossover frequency adjustment aside from what receiver offers, and no 'auto on/off'.