Last week or so I've noticed a weird buzzing sound from the 15in speaker in my tnt tour combo.So I decided to see what was causing it, took grill off played E ( dn tuned to D)open same thing weird buzz. Tightened speaker down it was loose and it went away sort of..Still a weird buzz but not as bad. But I just happened to notice what looks like a repair on the speaker surround some kind of rubbery black goo real hard to notice about 2-2.5 in long. Grrrr got a flash light and looked at the cones excursion/movement around the edges.The area that's been fixed doesn't move near as much as the rest of the surround when played.How much will this affect the sound and longevity of the speaker.It sounded a little off when I got it but I chalked it up to my horrible playing . . Ive changed my settings lately on the bass to use the bridge pickup more with a bit more mid and treble.So it's way more noticeable now.Both of my basses do the same thing sound wise.One bass only has one pickup (sub 4)Better to replace the speaker or not? I know it's a bit long winded.Sorry.Hope you guys have enough info.