Velodyne DD15 - worth repairing the plate amp?

It has composite video out for on-screen display. It does not connect to a computer. The computer connections are for software updates. It does require the remote and on-screen display to set everything up. It runs frequency sweeps that you can see in real time. It has graphic and parametric eq capability. Just read the manual.

You do need the remote and a video hookup. But there is a quick setup button on the back of the sub. Read the manual!

But there is a quick setup button on the back of the sub. 

@rwwear Are you sure of this? He is using the DD, not the DD plus. There is an auto-eq function that can be done pretty quickly using the remote on the DD. I don't see anything in the manual referencing what you are referring to.

Thanks, I need to read the manual (already downlaoded a while ago).

I believe the DD manual discusses sub positioning on an earlier page. This "TIP" on page 23 is incredibly important. It provides for the optimum sub to room interface which results in the least amount of amplifier power, guided by the software is used to Optimize and correct an improperly located sub. 

(Page 23 DD User Manual)   TIP: Here’s an easy way to find the optimal position for the subwoofer without moving it to multiple positions in the room. Start by setting the subwoofer up in your listening position. now, move the microphone around the room and observe the response graphs for different room positions. The best position has the fewest valleys and the overall smoothest response.

Since the DD manuals publication rather than using the microphone along with the Sweep Tones the later DD Plus manual suggests using the Subwoofer Crawl (walk) method during the Sweep Tones and listening for and mapping the rooms standing wave bass modes for the optimum sub positions. There are various Youtubes demonstrating the Crawl. Good luck with it. 

I would replace the plate amp.  There are many plate amp options out there.  Parts Express has a good selection.  No need for a very high-end amp on a sub.  I seriously doubt you'll hear a difference.  Concentrate on the inputs, power rating and features you want on it instead.  If the opening size is different, you can cut out the existing hole to match and if too large you can just add a piece of plywood or particle board over the existing hole opening, paint it and fit the new plate amp!