Velodyne DD15 - worth repairing the plate amp?

https://www.ebay.com/itm/235171193481?hash=item36c14ba289:g:m00AAOSwWP5k8e9c&amdata=enc%3AAQAIAAAA4D2R47q6a0gjClh3E2yk2dJEaQ9UB3uuayQATBHs87m1Ud1LN58h0zQ9Ig9OLp8ZnONSh8HEUzpVyMkiehzCupm%2BbFub5hiuVsA2RVmdKglP0Iviu3wg2NF78MpA8HJ1O0z2nnxm9mQszKzXgOcK2siJdEKmr6zvJoav9X3qtX13fAHEEhtBN3zI0vL0tQUzGoqARrOTIXuiCqCQthEiBJ5k1ing89b1hKGFRGn4uty4UAjjnTjWhH%2F1WNa7RRfnv%2BhLoGxYbJJI2wtkVD1fwitPoSygm%2BR70FF7ccDTc2q7%7Ctkp%3ABk9SR8rZ0-fiYg

rwwear: what does it do? similar to what audyssey does (measure room sound, make correction in time and equalizing frequencies, automatically)? 

It's an outboard version the one built into the Velodyne DD series. You can use it with any sub though. Can be used as a replacement for the Velodyne built in EQ if needed.

https://www.outlawaudio.com/products/SMS_manual.pd

This is the Hall brothers first release of subwoofer Equalizing I believe based on the Texas instruments platform using Velodyne custom designed parameters. Shortly after the SMS release the Digital Drive was rumored with an advanced servo circuit, driver and cabinet. The component SMS may have been geared toward supporting the companies legacy products and third party subwoofers?

Despite its age the SMS can provide more detailed capabilities than a number of current low frequency processing designs.

It's a great product if you want a simple way to set up subs that don't have built in room correction.

Minidsp does more but requires a computer. Once set up it doesn't anymore though.https://www.minidsp.com/