@ttocs I now have 2 of the Sumiko S-10's. Fantastic subs. Goes deeper than my Rel Storm 3 which was a great sub in its day. I too had a hum which I had to overcome. I found the fix on Rels website. It was not the cable coax in my system. I can tell you how to fix it if you need the fix. Give me a shout if its still humming.
Like you, I'm very glad that I bought these.
Like you, I'm very glad that I bought these.