MY SB850Z PROJECT [aw subs]

[matthewmazda]

Any pics of finished product

[b14inb12]

i would like to put up pictures of the system but the were all sold to a fellow tuner.
but this is what is look like and boy do they bang

[heads]

we could talk i have a woodworking shop

[heads]

we could talk i have a woodworking shop

[heads]

Have a woodworking shop we cud taik

[b14inb12]

In order to have true horn loading in a subwoofer, the horn must be
monstrously long, opening up to at least 5 feet square at its large
end. must be massive in size. A folded horn must be at least 4-5 feet wide, by 5 feet high and 4 to 5 feet deep.
This size is needed because the wavelength of sound at low frequencies
is very large.
But to directly answer your question, the advantage of a folded horn
(over a non-folded horn) is reduced size. There is no other advantage.
Compared to a non-horn loaded subwoofer, a folded horn woofer will be
massively larger, and have some minor sonic problems as a result of
the sound waves having to navigate the folds in the horn. so you must cut the angles right or else.

Having said all that, rest assured that a true folded horn subwoofer
will have a hard time fitting on a truck Anything
smaller, means the folded horn is just a useless gimmick. Basic
physics dictates that, in order to work, low frequency horns are huge!
check this site

http://forum.speakerplans.com/folded-ho ... 28806.html
you think a small table top can do this?


but the super scooper is my next project

need a silicone gun like the one in the pics

[Brian Steele]

In order to have true horn loading in a subwoofer, the horn must be
monstrously long, opening up to at least 5 feet square at its large
end. must be massive in size. A folded horn must be at least 4-5 feet wide, by 5 feet high and 4 to 5 feet deep.

Not necessarily.

My POC4 tapped horn which uses an 18" driver. can easily reach below 40 Hz (down to 33 Hz in-room) and it's nowhere near that size. 22.5" x 40" x 32".

My POC3 is even smaller.

[b14inb12]

In order to have true horn loading in a subwoofer, the horn must be
monstrously long, opening up to at least 5 feet square at its large
end. must be massive in size. A folded horn must be at least 4-5 feet wide, by 5 feet high and 4 to 5 feet deep.

Not necessarily.

My POC4 tapped horn which uses an 18" driver. can easily reach below 40 Hz (down to 33 Hz in-room) and it's nowhere near that size. 22.5" x 40" x 32".

My POC3 is even smaller.

thanks bro for the info
like your pic how does it perform in the open?

[Brian Steele]

thanks bro for the info
like your pic how does it perform in the open?

Dead flat from just below 40 Hz to just over 100 Hz, according to one quick measurement I took. Efficiency is a bit lower than bigger BLHs or FLHs though, but that's to be expected as there is usually a direct correlation between size, LF cutoff and efficiency (the "Iron Law"). Calculated efficiency is supposed to be just above 100dB/1W/1M in its passband. Fb is actually 32~33 Hz, so a little parametric EQ can extend its LF response even further.

Right now it's still a "Work In Progress". See that rope coiled up below the box? That was to stop it from moving back every time we ran Oliver Helden's "Pickachu" with its 30 Hz content (https://www.youtube.com/watch?v=YvmmIw_gnag) through it at high levels to test its peak SPL capabilities at low frequencies .

[Kasey]

Brian, where are the specs for that enclosure, and what sub did you use in it? It looks similar to the Cubos I built.

[Brian Steele]

Brian, where are the specs for that enclosure, and what sub did you use in it? It looks similar to the Cubos I built.

See here - http://www.diysubwoofers.org/projects/other/POC4/

The driver is the B&C 18TBX100-8. The TBW100 should also work, and give quite a bit more peak output.

It's still a WIP. I've recommended to the builder to add another layer of 3/4 ply to the bottom to stop the "walking" (a side-effect of cutting down on the amount of bracing that I recommended).

Funny thing is, I estimated about 5L of cone compensation would be required, and it turns out that 7.5L is a bit closer to what's needed. Makes only a minor difference around 120 Hz, so I'm not too worried.

[shane2.0]

In order to have true horn loading in a subwoofer, the horn must be
monstrously long, opening up to at least 5 feet square at its large
end. must be massive in size. A folded horn must be at least 4-5 feet wide, by 5 feet high and 4 to 5 feet deep.
This size is needed because the wavelength of sound at low frequencies
is very large.
But to directly answer your question, the advantage of a folded horn
(over a non-folded horn) is reduced size. There is no other advantage.
Compared to a non-horn loaded subwoofer, a folded horn woofer will be
massively larger, and have some minor sonic problems as a result of
the sound waves having to navigate the folds in the horn. so you must cut the angles right or else.

Having said all that, rest assured that a true folded horn subwoofer
will have a hard time fitting on a truck Anything
smaller, means the folded horn is just a useless gimmick. Basic
physics dictates that, in order to work, low frequency horns are huge!
check this site

http://forum.speakerplans.com/folded-ho ... 28806.html
you think a small table top can do this?


but the super scooper is my next project

need a silicone gun like the one in the pics

me too

[obcrs2009]

good day i would like to get some info on this

[b14inb12]

good day i would like to get some info on this

like what

[obcrs2009]

if u r interested in teaching me how to build these i have my own sound system but d boxes i got not good we can work out sumin thanks