Just a thank you to Brian Ding at Rythmik!
I purchased a DS12 kit 1 1/2 years ago. I had an enclosre built professionally and installed the amp and driver, and have been very pleased with the results. I recently had the itch to upgrade the original amp to the latest version that includes the rumble filter, PEQ and crossover switches. Just wanted to have those features for any possible future system configurations.
Brian answered all my emails quickly and made the swap very easy. He even sent me some batting to line the insides of my enclosure with, to replace the loose polyfil I had stuffed in it originally.
If anyone is on the fence about buying one of Rythmik's subs, no worries if you ever have a problem with it.
Thank you, Brian!