So, a while back, I built a 5E3. Built a head separate from a 1x12 cab. For the grillcloth, I used the "Fender Style Old Brown Grillcloth" from Mojotone: http://www.mojotone.com/Cabinets_x/Grillcloth_x/Fender-Style-Old-Brown-Grill-Cloth-53-W Well, for the longest time now, I've been unhappy with the excessive low end flubby nature of the sound I get--especially when the amp is cranked. I know that 5E3's are notorious for a loose and saggy low end, and it's just the nature of the circuit. So I told myself that for a while. Then it bothered me some more. I thought, maybe it's because of how I built the 1x12 speaker cab. I made an oversized cab in hopes of creating a bigger sound with more muscle so the amp wouldn't sound as "boxy" as some original 5E3's do to my ears. It's a pretty good sized 1x12--similar to the widebody oversized 1x12 that Mesa used to make. Well, today I'm playing it, and I've got it cranked pretty good since I'm the only one home, and there's that low end flab I've grown to dislike so much. Then I noticed something new--the grillcloth seemed to be flapping as I played, especially when I'd hit notes or chords in the lower register. I got closer to the amp, hit a chord and let it ring, and inspected the grillcloth in front of the speaker. Sure enough, it's flapping and rattling on there, and making an audible sound. (And if I held my hand firm on the grill cloth, it would stop.) By appearances, the grill cloth is nice and tight and looks great. No visible excess or folds or creases or anything like that. So I decided to cut thr grillcloth off and see what happened. (Grillcloth ain't that expensive to replace.) Presto! No more noise! And, conveniently, the high end is coming through really nicely--more than before. So here's what I've concluded. If you look at the grillcloth in the link above, you'll see that this grill cloth is some tightly-woven fabric, really. I believe that since it's such a dense fabric, it was actually hindering the movement of air coming off the speaker (which was a lot of air when I've got the thing cranked like I usually do)... This in turn stretched and loosened the fabric to an extent over time, which made it easier for the fabric to flap and fart on the speaker baffle. At the same time, since the grillcloth was such tight fabric, it was literally a blanket of sorts over the speaker, hindering the high end to a degree. Now I have to decide what to do with in the grillcloth department. I'm wondering if this problem would be solved if I used a grillcloth that allowed air to pass through more freely? Or am I going to keep running into this issue because I've yet to learn how to put grillcloth on a baffle properly? Would I be better off finding a round metal grill guard that protects the speaker and allows air to really move freely off the cone? (If it wasn't such a hazard, I'd leave the thing uncovered indefinitely. But with three young kiddos in the house and gigs where accidents happen, I'm just asking for someone to poke a hole in my precious 15w Alnico speaker.) Suggestions? Would the "right" grillcloth that allows air to flow easier through it be a good solution?