Plan ! - D-20 (hz) Macro Sub ..tapped horn by moi.

freddi wrote: I just want to get the input numbers "ok" - from my sketch - was my hornresp input window ok? - it needs to add up to the correct volume, etc  - - what happens at the bend of a one-fold TH/ITH? how much taller might it need to be to get 30Hz ~flat? - - is there an easy way to reduce the 138Hz suckout?

just simmed the driver as on the prt scrn, it doesnt frankly seem to be suitable for this loading; to get it to do what it should.. will look into this more later, ive got a wedding to go sit around infront a mixing desk for...

the path seems long enough to get some useful response, at a guess that should at least run flat to 30 with the right driver. the length of the horn determines the low cutoff (how low it goes), this also determines at what freqency the first cancellation peak occurs at, which is unavodable, you can only move this comb filtering up by making the path of the horn shorter, which negates the point of it being a sub ;) ..so its a comprimise between where you have to cross over and how deep itll go, on this account, it seems a little more forgiving than the usual tapped horn per same low cutoff :)
i did however note that heavily wadding the rear chamber reduced the peak in these suckouts further up the range. unlikely itll magically make 138hz all better; can but try however :)

with the fold, imagine youve drawn the path out as one streight line and you have folded it round the bend, whilst folding it from a point in the middle of the volume (the bend has length, imagine a line being drawn down the middle of the air volume) this will give you the right tollerances for clearence to wall and the size of the taper as it continues upto the exit.

don't have a corner available right now   - tell me what "about" specs my pipe might like - there may be another woofer laying around that works better - not to say this isn't good performance  

thanks -- here's that ITH with 295070 shoved into my thin drywall corner

well, that certainly seems to be loading effectively there :)
Theres just not the baffle area or horn mouth with tapped horns to make sure their low output finds its way into the room at modest levels.
Try playing around with differing room placements along walls & away from them.. & you may find particular sweet spots to your liking :)

where its sitting - I'm not getting much difference between a 5x16.25" slot and ~60 or sq.in. invertered "T" slot - - should I open the T up a bit and it so "where"? - its about 10" tall overall

maybe in the corner they're bumping up giving illusion of dip?  Karlson's tilted baffle kinda aim the driver's lobes up the pipe - more reverb and wave slicin'  --- a thin slot would be interesting - might get closer to firewood   --- how low is low enough for home music use? - - I've enjoyed bowed bass and cello on some speakers (Karlson) which don't go low better than some which do but sound pipe-like.   Linkwitz transform sealed boxes are about he only thing thats tiny.. I've re-tuned Karlson with Altec 416 per a company called exemplar and boosted at ~30Hz - pretty good tone with theatre organ.  An ITH sub with 12" to hit 20 might be a lot of fun and poke nicely in corners
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