1db has to do with the difference between stuffed (example polyfil) quite a bit and not stuffed as much.
Originally Posted by Augerhandle
I didn't get the context and go on a tangent
Not the internal volume. That's what I referred to as having 1db easy gain in a dual enclosure setup. Pay attention!
But furthermore, the gain is that you don't have to guess how much bracing you need. You don't guess how much power you need, you don't guess anywhere in your build, except when it comes to the bracing. The tune is set in stone, you argue nine million hours about how much pillow-stuffing is correct and where to place it, endless discussions about how to wire the drivers to particular amps and what wire gauge to use, surge protection choice, acoustic treatments, etc. Then bracing is just "I'll eyeball it, will probably be quite enough, I guesssssssssssss".
Double the frequency require 1/4 the xmax to produce the same db output. Double the frequency until you get up to 750hz like the -3db point on the crossover for my speaker, then its quite small movement that is required for there to be actual db output from the enclosure surfaces.
Thus my full range speaker requires stronger faces than a regular marty.
But how much? Well that's what we can find out with simulation.
The sound, any sound, coming from the enclosure faces, is distortion. Stuff people pay out their behinds to not have on their drivers and speakers, not to mention their entire electronics portion. Then they put acoustic panels and diffusion elements and carpets and bass traps and they remove rattles and stuff by remodeling the interior of the room. Maybe with decoupled sheetrock and green-glue, special AC vents that don't make any noise and don't transport noise out of the room. They play their expensive lossless tunes on balanced expensive cables through a meticulously EQ'd system on drivers that cost a grand extra each to have the absolute minimum distortion. Heck, maybe the cones are carbon fiber, and even more exotic HF driver material.
Then the enclosure makes more distortion than all the drivers combined because its filled with pillow-stuffing not bracing (the faces vibrate even if you fill it with stuffing). And they would never know, and conclude their DIY martys and DIY LCR's are braced enough. But they didn't touch a CAD program. Then they go on to someone else and say "I braced this much and its great
So a guessed amount of bracing with no known amount of benefit is great
. Imagine if you actually knew how much you braced and how much effect it has had, there aren't words in the English language for it, if the unknown guessed brace is described as great.
PS: Here's the actual text you READ, but didn't read at the same time:
But in any case you could get a lot more output if you didn't need any filler
in a marty because of
having a very rigid enclosure.
Well, "a lot more"
being comparative to its cost. 1db
more output from a double subwoofer setup by bracing and removing filler
isn't difficult. If it costs you 2 grand to double your wooferage to 4 with twice the amps, then 1db for 10 bucks or something in glue in addition to some cut-off material, is a quite rational expenditure of calories.
PPS: And my build only goes up to 750hz where it tapers off. Because the compression driver doesn't apply anything above that inside, it all goes out the horn because the driver itself is closed at the back.
Other builds can have mid woofers instead of compression drivers, that do 6000hz before they pass over the responsibility to some HF drivers. Imagine 6000hz audio waves striking the internal faces and then having guessed amounts and configuration of the bracing. Do you know how little movement is required to get db output akin to the distortion figures of a driver, if the frequency is 6000hz and the area (cone area as it were) is up to six enclosure sides?