GM's MLTL with 416-8B

[westend9]

How bout using water and soap ? Can you use wax on the area to keep the water from penetrating the wood ?

I could but not until I have a finish on the wood. I am thinking about GM's idea of the alcohol and shampoo.

Those look great--nice progress!

Thanks,
I am putting tung oil on the Maple that I used on the sleds and I'm acutually excited. I've finished a lot of wood but this spalted stuff is really cool (and it's mine).

Guess you've never leak tested any early Altec or similar consumer cabs.......... How do you think I learned this? Indeed, if you look at early T/S programs, considerable leakage [low Ql value] is recommended in the vented alignment design routine due to how hard it is to seal one up properly for most efficient vent action.

Heathkit's vented cabs OTOH taught me what 'tight' was all about. Ditto theirs and AR's sealed cabs.

GM

Yeah the original Model 19 must have had some pretty fair leaks. IIRC, mine had the top enclosure just bolted to the bottom cab with four long bolts into cleats. The dividing partition (black board) was particle board. with a rough edge. The laminate was what made it look finished.

You're welcome, though I've never tried either the candle or smoke test, just have read of others doing them. I've always used Windex or generic equivalent as it blows nice bubbles and doesn't hurt any wood/finish I've sprayed it on, though I use a small pump sprayer normally for cleaning eyeglasses to keep overspray/saturation to a minimum and if it's any kind of particleboard I just automatically caulk it and it 'is what it is'........

I'm sure a vent could blow out a candle, but I doubt a typical leak could even at peak SPLs on underhung motors such as Altecs, though I imagine one of those 15-25 mm Xmax monsters being pumped up with a few kW might.

Probably not, but watch the excursion and don't exceed an 'eyeballed' Xmax value or ~3 mm [1/8"] if none is available.

WRT ear plugs, that's a personal call since at low frequencies we can tolerate a lot more SPL for a lot longer time without damage than higher up in our acute hearing BW. Anyway, around/at Fs in a ~sealed cab shouldn't be all that loud sounding even right next to it with just a single LF tone at this low an excursion. Get up around 80-100 Hz though and its T Rex stomping on your head or you're at the intro to a Headbanger's Ball.......

GM

I've got a box that will hurt your ears, a DIY subwoofer in a small sealed box. The woofer was used for one of the Mfg.'s car audio teams, they doubled the magnet to about 40lbs. The thing will shake your drink across the room, if you want it to. I push it with a proaudio amp and use it for HT. I have it moderately playing below 80hz.

Sleds are drying on the first coat of finish, the Maple is very nice against the birch plywood.