What Do You Think . . . and How Does It Work?
twoleftears2,407 posts05-20-2020 9:53am Didn’t HSU make home subs from cylindrical cardboard concrete forms back in the day? Sonotube, and a lot of us, poured the concrete, too. Concrete Tubes are dead silent. No problem, with vibration, just placement.. 18" vary from 60-100 lb a foot. Depends on wire size, the mix and thickness. Taller the tube deeper the tone. I used an underground vault on time.. Two PA drivers. It has had, 12,15,18" drivers. Settled on 15, last time I looked 1 block of BASS... 2-400 watts "T" base bens too. The uprights were passives the crossbar was active. Talk about boom boom, very easy to room tune also.. length or PR, true glass breakers..Very space hungry laying down.. OP is on to an oldie for sure, they been around for a while. I’ve seen a few, different designs, We called them 3x2. Three way, Two driver Pipe organ design, Length x diameter.... for the blend....... ahhhh the blend Can also stuff the tube and move the stuffing up and down for tuning. Bull horn style is fun to.. Honk Honk.. Think Ampa... Regards |
Aluminum, is a good material for low resonance, and great strength. The problem is cost. Oh my. MDF 13-15 ply plywood, void free 3/4" Hardwood Aluminum As far a cost, lowest to highest. Some hardwoods can exceed Aluminum for sure, but normally they are veneers. There were a few companies that used PVC enclosures. Advent, Same era, Infinity was using cast Aluminum/magnesium at 10 times the cost, and 5 time the Retail. I'd like to say my speakers were CNC from marine aluminum, but paying for them, is a whole different story.. Here the thing though, cylinders, have an inherent characteristic to ECHO and GAIN... not disappear, or blend like you want.. They're usually have pretty high mechanical distortion. Even with a lot of baffles.. Concrete pipe... ECHO, even long square tubes echo, and GAIN.. Big BASS Yes especially loading a tube inside a tube, and porting both enclosures. That's a 6th order, band pass. Home use.. OH my, you couldn't do it. Pictures would be falling off walls. Columns... They work. Less real estate, less distortion, more bass, BASS, B A S S.. |
not really. it rings like a bell.
Yes it can, when used for TT platers, and is forged, but there is a reason for that too. Galvanization issues. With Metal housed planars. Forged, won't GROW Barnacles (as fast) as cast will. Cast alu without a treatment, can get flakey in less than 5 years.. Double in thickness in 15 years. Aviation shot peen, stress relieves and removes, pocket resonance, issues, also.. Most speakers that use Aluminum, use it for it's milling ability. EX: GR Research LS9 (Beta) and a few other. Infinity Infinitesimal v.5 and 1.0 (cast) CAST.. is actually the best , Highly porous, (to a point) dead silent. Light, strong, easy to cast, easy to mill. A lot like a cast aluminum engine block (neutralizing agent required) Cast, Alu/Mag (no barnacil alloy) rims, dead silent. There is a reason they cast rims.. A lot quieter than a steel or spoke. Columns..... Regards.. |
This design gets the benefits of a spherical design, but also adds a tapered tube at the back to eliminate all internal resonances. Shape VariationCube +-5.0 db Rectangle +-3.0 db Cylinder +-2.0 db Beveled Cube +-1.5 db Beveled Rectangle +-1.5 db Sphere +-0.5 db Interesting, for a complete speaker system, round. smooth, tapered interiors, are a way to reduce pocket resonance. It can also be used to incorporate a resonance into an enclosure also.. That was my point, the GAIN factor, for BASS is a real issue for distortion in the bass region 250hz< You have to use it or lose it, but you can't keep it.. When speaking of spectral decay effects on enclosure vs mechanical distortion (GAIN based) there is no comparison in how much one increases over the other. (The 20% bass distortion crowd, and don't even know it) Interiors that are rough inside, not smooth are a much quieter enclosure.. The SQ is always better.. Remove the Highlands Scottish wool from behind the mids, let that blister your ears a bit.. or Remove the VERY coarse fiberglass from the bass enclosure... BOOM....forever........ INSIDE, Smooth is bad. OUTSIDE, Smooth is good, but just for the dust factor. if it wasn't for that rough would be better. Regards |
The whole reason for OB, right, boundaries, and boxes are not the first choice, of a seasoned speaker builder. I’m not a commercial speaker builder, seasoned, oh yea.. I build what I know works, for over 45 years, now. The 120 to 130 pairs, I’ve put out...Not a round one in the bunch. Though I did do an underground concrete vault one time.. that is still working fine.. 1/2 ton OB Lattice structure, with ribbon and planar drivers are my thing. NO BOX, NO TUBE, it’s not round, event the driver openings are rectangle, not round... Time to go feed the chickens.. and George... the goat. and Junior the rabbit, and Bubs the dog. Regards.. |
