I'll pose the question first, so reading the rest of the post will become optional; Has anyone sealed up an Ampeg SVT 410 HLF to see what it sounds like? Is it similar to the 410HE? The stock cabinet is puffy pillow LOW without much midrange, so I was thinking about sealing it up to see if it becomes a little less "sub" and a little more punch. I know some speakers are compatible with both ported and sealed applications, but I don't know if the HLF speakers are. There's some effort involved with just getting the grill off, so I thought I would get a readout from someone who has expended the effort already. Optional reading..... Ok, the reason I ask; I have an old Peavey 410TX cabinet that I've owned for years. I've removed the inductor of the crossover to get more mids, and reinstalled, I exchanged the speakers with a TVX to make it a 4 ohm, so it's been in the "lab" before. This week, I found that the lower half of a plastic gallon jug fits into the rear port perfectly snug, so now it's a sealed cabinet. It actually sounds pretty good sealed up. It lost some low end, but it gained some medium punch in the mids and upper mids. It reminds me a little of the Ampeg SVT 810 I got rid of before my impending back surgery.... Did I pull all the speakers and seal around the frame? No. Did I pull the handles and the control panel out and seal? No. Did I change out the input jack in the control panel for a sealed unit? No. However, I can pull the "half jug" out of the port, and it's back to the original cabinet tuning. That won't be the same with the Ampeg should I choose to try it sealed up.