Raise 80lbs or 36.7kg ? (Stated rating.) ...Rather you carrying speakers that size than me, mate...
But these featherweight wonders WILL do just that.
Let's be quite clear about their unique mechanism. SLANTED grooves (on the outside of its internally re-enforced riser tube) mesh with the crank's winding gear to form a screw jack, ...decidedly NOT the rack and pinion or "cable and reel" solution offered by most others.
Why am I prattling on about this ?
Because, when UNclamped ...the screw jack is the ONLY mechanism of these that will remain solidly fixed unless it's actually being cranked.
The riser's knobbed "locking" bolt therefore becomes optional, mainly to prevent acoustically induced rattles or buzzes.
I weigh around 95kg or 210lbs. Applying my full weight (plus G-forces) could not force ANY retraction whatsoever when "pogo sticking" an inverted SS8800B that was extended without its "locking" bolt being screwed in.
That being said, a word about the spreader position in the "brochure" snapshots.
Under NO circumstances should any speaker be raised with the tripod base's legs angled as shown. The stand should only be loaded AFTER the correct deployment (for maximum stability) of the spreader mechanism, a procedure I'll detail below.
(I find that working the legs upside-down is often the easiest way to both start and conclude their spreading.)
1) "Over-spread" the legs past their largest "footprint".
2) With the large "locking" knob UNclamped, plant the stand in its intended location.
3) Use your full weight (probably a lot less than mine) to bear down above the crank housing so as to find where the tripod spreader is most "happy" to sit. This is the position of highest stability, which will have the triple-hinged leg collar a lot lower than shown in the snapshots.
4) Only then should you lock the spreader mechanism, safe in the knowledge that you're now NOT relying on its clamp for stability.
Also, I often use a pair of (or, very rarely, even three for a "hurricane") 15kg (33lb) shot bags for wind-loading.
These are best added AFTER the above procedure, (but before the speakers) by dint of sliding their webbed strap over the entire centre column (the removable crank's a great help) so that the bag ends up "dangling" between the legs, its strap handle securely hooked over the triple-hinged spreader collar.
Hooked this way they're not only less of a "target" for mischief, but they're also transferring their effective ballast to the lowest possible centre of gravity, right at the very end of the stand's legs.
All in all, this is finest and most "back-saving" rig I've ever experienced.
It's also one of the cheapest.