Well G, if you can get into your crawl space without too much contortion, you can always what I call "spot stiffen" the floor where your rack or speaker will sit.
This is done fairly easily by any builder (and a lot of handy homeowners) by using a small concrete post base from Home Depot and (using a short jack) jamming a short piece of 4x4 strut between it and the joist(s) above. It only takes a couple of these to do a rack or a speaker. (And it doesn't have to be pretty ;~))
This is done fairly easily by any builder (and a lot of handy homeowners) by using a small concrete post base from Home Depot and (using a short jack) jamming a short piece of 4x4 strut between it and the joist(s) above. It only takes a couple of these to do a rack or a speaker. (And it doesn't have to be pretty ;~))