does anyone any insights on designing oversized enclosures for single driver speakers?
as i understand it, when he made Le Petit, Hiraga used a big port to boost frequencies below that of the resonant frequency of the little fostex but i dont understand his reasoning behind the size of the enclosure, and i read the original L'Audiophile article.
please no critique of the design itself (dave 😉 but i would like to hear how people approach making oversized enclosures for single drivers.
as i understand it, when he made Le Petit, Hiraga used a big port to boost frequencies below that of the resonant frequency of the little fostex but i dont understand his reasoning behind the size of the enclosure, and i read the original L'Audiophile article.
please no critique of the design itself (dave 😉 but i would like to hear how people approach making oversized enclosures for single drivers.
I liked a huge box for my pioneer b20, qtc came in around .577 verus the much smaller sand filled walls qtc .707
It was 1' deep x 2' wide x 3' tall with driver clean up at the top.
Large box = large front baffle, to me better support of mids versus skinny box with high baffle step.
Also, I think it may have something to do with back pressure or the back wave.
People think open baffle has equal loading pressure front to back tracking.
What comes off the front also comes off the back.
If a driver is squishing the air behind it as it travels in, the spring force pushing outward may influence (modulate) or make it more difficult for the driver to reproduce the signal from the voice coil.
Just a theory.................
It was 1' deep x 2' wide x 3' tall with driver clean up at the top.
Large box = large front baffle, to me better support of mids versus skinny box with high baffle step.
Also, I think it may have something to do with back pressure or the back wave.
People think open baffle has equal loading pressure front to back tracking.
What comes off the front also comes off the back.
If a driver is squishing the air behind it as it travels in, the spring force pushing outward may influence (modulate) or make it more difficult for the driver to reproduce the signal from the voice coil.
Just a theory.................
I've found when simulating vented enclosures, the program winds up giving you an "ideal" volume, but by changing fb, or "frequency of box", one needs to balance this off ideal lower frequency with a coordinating larger & larger box.
But by looking at the graphical response, yeah you'll reach those "lost" lower registers...but it will put a "hole" in response, a little at first, but will get worse and worse as you try to go lower...so how big a hole in DB response will you accept?...1.2 Db, 3.5 DB, 6.6 Db...??? All there on the graph for you to peruse.
-------------------------------------------------------------------------------------------------------------------------------------------------Rick...
But by looking at the graphical response, yeah you'll reach those "lost" lower registers...but it will put a "hole" in response, a little at first, but will get worse and worse as you try to go lower...so how big a hole in DB response will you accept?...1.2 Db, 3.5 DB, 6.6 Db...??? All there on the graph for you to peruse.
-------------------------------------------------------------------------------------------------------------------------------------------------Rick...