BillFitzmaurice.info

I took the idea of 1/2" plywood complimented by 6" spaced 1" thick beams....0.5/.75=1.5(6)=9" so with 3/4" ply, 9" spaced crossbeams might do the trick....Very crude conversion but...its all I got lol. Seth - I like Bills designs but non of them are tuned as low as I'd ...

Good point...Not everyone in DIY is on the level Bill is, regarding bracing, so the standard out and about is 3/4"....out of fear I just ran with 3/4"....figuring it couldn't hurt anything other than my back lol...If they get rebuilt, I am sure 1/2" ply, with 6" spaced, 1" b...

A guy on the AVS forum said 8-12".....Bill just stated 6" as being optimal. And now with your input we have 6-9" spacing....its all pretty close.... 12" wide panel with 3/4" adjoining panels on each side leaves 10.5 of space in between... 6" is optimal bare minimum ~9-1...

Ty Bill!....Seth, I am really into the science...and I try to question all things but I also like to get my technique straight from the horse's mouth...in this case...Bills mouth lol!!! That is an interesting link...People nowadays run simulations to show cause...matrix bracing is very sound theory ...

Ty kindly for the quick spoon feeding

I wonder how you came to this conclusion for spacing...has it any relation to sound modes?

I was almost certain that the pressure swing in vented design was less than a sealed considered the pressure is relieved by the vent.. That's a common misconception. The vent doesn't relieve pressure. It increases it, because it's not a simple hole in the box, it's a Helmholtz resonator. Many is th...

Each rod goes through a threaded insert at every baffle...locknuts hold the woofers, there is a good amount of tension on each rod, but I get your point. I've got to figureout how to keep the rods from ringing at this point...I'm hoping tape will do. Thanks to the bracing provided by the threaded an...

Discussion on this topic is interesting but a quick trip to HornResp tells most of the story...it seems pressure peaks around tuning is highest and drops off above and below tuning....which makes sense...the lower the tuning note the higher the pressure.....that also makes sense... The middle pictur...

I can maintain my own thread... I don't mind the discussion either. (content doesn't need moving) From another thread , in regards to rear chamber pressure of a ported cabinet vs. sealed cabinet... I disagree with Seth (dui bu qi) because I think that the vent would relieve the pressure. Tom (yaba d...

"proper reflex 12 with like 1kw+ the max spl" You've tapped into the joys of high efficiency....Horn loaded speakers own this area....Yet high efficiency drivers are still available for direct radiator situations...which still require way less power than a low efficiency car audio speaker....

Good read! Group delay is definitely the culprit and your design is the conduit...I once said that any vented design with the resonate note placed within the passband is "sloppy"....the group delay suffering, due to the conditions around the tuning note (woofer diapragm slow to move but on...

Interesting!!! Thank you for replying. Regarding pressure swing of vented vs sealed, that is very interesting...I was almost certain that the pressure swing in vented design was less than a sealed considered the pressure is relieved by the vent....that is interesting, I'm sure i can find some who di...

HI all....I have a sub I am trying to tie up my loose ends with....it is a sealed box of the PushPushSlotLoad variety....I have 2 18s facing each other in the slot and threaded rod going from one side of the box to the other mounting the drivers....Potentially overkill in that area...but....oh well....