Just take the cross sectional area and the length is simply the folded TL length. I can't remember off the top of my head the bookshelf folded MLTL but if it is 15 in deep x 3 paths (2 folds) that is 45in. For the wall mount it is one fold and 20 in high so 40 in long. In both cases put the driver at 1/3 distance from closed end. It can be adjusted to 1/5 distance from closed end without significant deleterious effects.
I would go for the 0.4x Karsonator though if you haven't built it yet - that sounds superior to both of these.
I would go for the 0.4x Karsonator though if you haven't built it yet - that sounds superior to both of these.
No, i didn´t build the Karlsonators.
I have more than enough projects for my own stuff (especially for my outdoor party-machinery) atm.
plus i finish university this summer, then i will have more time than now.
I´m going to build the wall-mltl for my sisters small room in a students community.
there is not too much space and i think about building the wall-mltl as it is in your plans, but with an integrated TPA3110 module.
So my sister would only have to plug in a sound-source and a psu.
I think about putting the connectors on the bottomside of the cab.
I asked for the parameters because i was fooling around with the folding.
I have more than enough projects for my own stuff (especially for my outdoor party-machinery) atm.
plus i finish university this summer, then i will have more time than now.
I´m going to build the wall-mltl for my sisters small room in a students community.
there is not too much space and i think about building the wall-mltl as it is in your plans, but with an integrated TPA3110 module.
So my sister would only have to plug in a sound-source and a psu.
I think about putting the connectors on the bottomside of the cab.
I asked for the parameters because i was fooling around with the folding.
this might be difference in my calculation:
for each fold i added the arc of a semicircle with radius 1/2 of the width of the cabinet.
so in the case of the wall-mltl it was two line segments with the length of (20inch - 7.5inch) plus one arc with a length of (pi * 1/2 * 7.5inch).
this gives about 37inch of L.
Hope this explains it (assumption here is that turns are sinple 45 deg turns x 4 = 180 deg fold.
Attachments
The arc would capture the smooth path but in this case there are sharp corners. If you look at what is happening with the cross sectional area through a turn it is an expansion by sqrt(2) then contraction the expansion then contraction. That accordion profile simulates what the corner is doing to the acoustical inpedance well. It acts as an acoustical low pass filter when combined with an inertial factor for flows around a corner. This is all so we can model it with a 1d lumped element model. If we did it with boundary element model we would just use the exact 3d cad model. So short answer is itbis a simple way to simulate effect of sharp turns.
long mltl
hi xrk,
may i ask you to take a look at the 'basic' mltl-plan i did a few moments ago for the TC9FD.
please excuse the use of the metric system; converting the values might be source of error.
the driver should sit at 1/3 of the line.
for the vent i'm going to a pvc-pipe.
tomorrow i'm at the home-improvement center and check if they have 60mm or 63mm (i think both will be ok).
my idea is to use to use only one half of the pipe as the vent.
it will be ~60mm long.
is that too much, if the cabinet is only 110mm deep?
i will also watch out for a 78mm holesaw.
i have an 80mm holesaw (which actually makes an 82mm hole, so maybe i should search for an 75mm holesaw), but that makes a slighty too big diameter.
while testing that i recognized what an exactly cut hole that little driver needs + how snug the driver will sit in its notch, if mounted onto the baffle (especially at the solder lugs).
here's my sketch:
hi xrk,
may i ask you to take a look at the 'basic' mltl-plan i did a few moments ago for the TC9FD.
please excuse the use of the metric system; converting the values might be source of error.
the driver should sit at 1/3 of the line.
for the vent i'm going to a pvc-pipe.
tomorrow i'm at the home-improvement center and check if they have 60mm or 63mm (i think both will be ok).
my idea is to use to use only one half of the pipe as the vent.
it will be ~60mm long.
is that too much, if the cabinet is only 110mm deep?
i will also watch out for a 78mm holesaw.
i have an 80mm holesaw (which actually makes an 82mm hole, so maybe i should search for an 75mm holesaw), but that makes a slighty too big diameter.
while testing that i recognized what an exactly cut hole that little driver needs + how snug the driver will sit in its notch, if mounted onto the baffle (especially at the solder lugs).
here's my sketch:
I don't have Akabak at this moment so cannot run sim. However, overall volume and dimensions of the TL are good - 11 liters will work well to get you deep bass. The vent seems a bit too large in diameter. You want a vent cross sectional area to be about 0.33x Sd of the driver. 36cm2/3 is about 12cm2 which is about 3.9cm dia pipe. Perhaps 1.5in inside dia PVC pipe is good? You can use a bass reflex program with the AMLTL technique to get the vent sizing. I am guessing it is about 4.5in to 5in long and this will give you fb around 55Hz.
You will also need a BSC to flatten the response - probably 0.8mH parallel with 7ohm to 10ohm resistor.
You will also need a BSC to flatten the response - probably 0.8mH parallel with 7ohm to 10ohm resistor.
Have the vent down firing along length of MLTL, elevate the bottom off the floor by 2in and make 1.5in deep cutouts on the walls to allow the vent to escape. Much like the metronome design. You are basically making little 2in high legs from the sides. Or if you are "bent" on having it front firing, use a PVC elbow (pun intended). 
Xrk,
Can you recommend a foam core speaker for either of these two drivers?
Pair of these
SPM-200X/4
Or these
Monacor SPX-5/2TB HiFi Coaxial Speaker
Can you recommend a foam core speaker for either of these two drivers?
Pair of these
SPM-200X/4
Or these
Monacor SPX-5/2TB HiFi Coaxial Speaker
I can't find TS params on the coax but if Qts is between 0.4 to 0.6 can use in Karlsonator.
