Collaborative Tapped horn project

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#1,641
i think i may be getting somewhere, basically i take the total horn length i can make

440cm, then i do

440cm(total length minus segment 1 L12 (15.24cm) and segment 3L34 (15.24cm) this gives me 409.52, which i type in the segment 2 L23 box

so 440cm-15.24-15.24=409.52=a slightly lower response of the horn

maybe with abit of stuffing as well if this will make the line longer, im not sure

this changes the length of the horn in horn response, and i think it is the same as basically stretching the 30hz horn mikehunt is building

from 1831mm to 2220mm, this SHOULD give me the desired response, i will post up the before and after simulations for the 30hz horn, and the stretched version.


An externally hosted image should be here but it was not working when we last tested it.


is this correct or am i missing something again?

if so it may not be the final design, i could try with different drivers but the basic principle is there

it doesn't look like much but it does add 10db at 20hz apparently

that was hard work to much copy paste and brain work, time for a nice cool beer 🙂

loving this forum
 
#1,642
and the response in arabak looks even better, it is using Williams 30hz horn script (i hope this is for the same horn could someone confirm for me please) with a eminence definamax driver with the horn length from front and rear of driver set at 410cm

An externally hosted image should be here but it was not working when we last tested it.


best not post anymore long images lol

*update* the horn mikehunt is making and his plan, differ in dimensions from Williams horn, thats why the response looks better in arabak than horn resp, mike did u change the plan a tad? getting me confused

now i need to re sim using the stuff from the 30hz script in horn resp if i can, and see what i get
 
#1,643
iand said:


Simple answer -- no...

Which is kind of disappointing, since it seems like a pretty fundamental issue when trying to figure out what a tapped horn is capable of, especially for high SPL applications.

Ian
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I'm guessing cone travel isn't easy to measure really... I've thought about making a recording with a video camera and seeing how much it appears to travel by looking at the still frames...

I guess I can also try comparing SPL results from an SPL meter to hornresp, but this would have to be done outside ideally...

Naudio, it seem almost all TH's go lower if you make L23 longer... You do lose some SPL tho, there's always a trade-off. I don't really need mine to go any lower than 30Hz, so William Cowan's 30Hz enclosure is ideal for me. Have a look into his 18Hz enclosure, you can also get peerless drivers in the UK, if you are buying a driver also. The definimax is a great driver for the 30Hz enclosure tho, may overkill even. It doesn't have a huge amount of Xmax, but it's great with high power (4" VC)

I finally finished mine today - It's taken me long enough!

Bracing added:
An externally hosted image should be here but it was not working when we last tested it.


Final panel glued on:
An externally hosted image should be here but it was not working when we last tested it.


Driver installed:
An externally hosted image should be here but it was not working when we last tested it.


This is my first decent sounding sub, I was using 2 x 12" reflex enclosures before. and this stomps off over them with less than 1/4 of the power! It also goes lower and sounds really clean. Not boomy at all, and sounds great with both music and HT.

I've only played around with it for an hour or so, and I'm more than impressed. This was with 200W of power, I have yet to try my amp in bridged mode (800W). One thing I can say, a detached house or deaf neighbours are almost a requirement before building one of these. 😀 Seriously tho, I just want to say thanks to you guys for giving help and sharing knowledge, it's not until I plugged it all up and tried a few tunes and films I realised all hours of reading, hornresping and making sawdust was worth it.
 
#1,644
ha ha i live in a shared house lol, there going to love me

the definamax seems very simular to the driver u ended up with

your horn looks brilliant, and u seem very happy, carnt wait to get something put together, im just desperately trying to get at 20hz design im happy with. the lab12 looked good, just carnt turn sim into design here, but im liking the new design i should be able to settle with that, just need to know if my simulations are correct, hint hint...

thanks
 
#1,645
Naudio said:
ha ha i live in a shared house lol, there going to love me

the definamax seems very simular to the driver u ended up with
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The Definimax 4012 is nearly identical to the Magnum 12HO, in fact there are other horn designs (Tuba36) where both drivers work as well as each other apparently.

As for having a shared house, I'm sure your housemates must go on holiday occasionally... 😉
Naudio said:
your horn looks brilliant, and u seem very happy, carnt wait to get something put together, im just desperately trying to get at 20hz design im happy with. the lab12 looked good, just carnt turn sim into design here, but im liking the new design i should be able to settle with that, just need to know if my simulations are correct, hint hint...

thanks
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Thanks, it took quite a while to build, but it was easily worth the effort.

Your hornresp sim looks fine to me. All you do is to make a slightly taller version of the one I made (William Cowans 30Hz enclosure) as the only thing that has changed is L23.

I'm not sure how mine compares to the sim in terms of SPL, I haven't had time to make any measurements but I can tell you it really does shake everything including doors, glass, cupboard doors, etc..

I'm guessing you want 20Hz for HT, but once you take into account room gain, you'll probably find 30Hz more than adequate for HT really (especially in a shared house!😱 :devilr: 😉 )
 
#1,646
Hi Mike,

I built a "tuba 36" but with a longer travel driver in it. (14mm linear Xmax 12")

for fun if you can get the movie "minority report" and play the part where they are firing off the wind up gun thingies on your TH..

well if you hire the dvd you will know what i am talking about 🙂
and so will your neighbours - neighbours 🙂


-Dan
 
#1,647
tuba36 pic
 

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#1,648
hm said:
i think so...
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I dont think this could happen. If you combine two horns, two things happen. First, they can act as a horn of the combined size, second, they add their output. So what you accomplish is nothing new. You just have two drivers and two horns. This way you get more acoustic output based upon the priciples in the sentence above. Your help is much appreciated, but i cannot see how it can be of use. Maybe someone with a better knowledge than me could clarify things?
 
#1,649
what i need to know is will the 30hz horn stretched to a length of 2220 have the response calculated with the eminence definamax driver, that i posted last night? just want to make sure i got everything right before i start building

and will that driver let me get 110db before reaching its 6.2mm xmax

try playing some dubstep, will shake everything, loads of strong 30hz bass there. u gotta get a good track though cos some of it is abit dull sounding, try playing this lol

http://www.youtube.com/watch?v=ODyXPCmEAlI

and here is some radio, http://www.dubstep.fm/ its not all good but there is some class stuff there (FOR BASS FREAKS)
 
#1,650
danieljw said:
Hi Mike,

I built a "tuba 36" but with a longer travel driver in it. (14mm linear Xmax 12")

for fun if you can get the movie "minority report" and play the part where they are firing off the wind up gun thingies on your TH..

well if you hire the dvd you will know what i am talking about 🙂
and so will your neighbours - neighbours 🙂


-Dan
Click to expand...
I've added "minority report" to my rental list. 🙂 Another good one to try is "Finding Nemo", there's a part where a girl taps on the side of a fish tank... It's pretty scary when it happens!
 
#1,651
Hello,
i do compair a few month the TUBA JX92S with the KORNETT,
half size and better and cheaper, tighter bass.
make 4 constructions, several measurements and 10 studies,
tell us the system membran movement and what it causes on my double horns?

if it works, Trombone two 3" driver with 125 Hz reso get down
35 Hz with a 60 L enclosure with sum of 4,2 m horn,---

-----
your are right,
if someone tell me that story five years ago,
I would laugh and kick him,
1. physically not possible, first thought
2. more important for me, than it has been checked around
1930 in practice, but didn´t happened

---------

take a 1,7 m tapped with a 6,5" and a 2,6 m tapped with 8"
near a corner indirect, parallel and i think you will get smaller variable enclosures and a better bass as a 10-12" single bass specially in normal rooms, at low levels the inertia of the moveing mass is listenable, mass cost solution.

more i can not do.
 
#1,652
I've only just seen your reply...
Naudio said:
what i need to know is will the 30hz horn stretched to a length of 2220 have the response calculated with the eminence definamax driver, that i posted last night? just want to make sure i got everything right before i start building
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Everything looks good to me. Another way of looking at it is you've extended L23 by 81.22cm, so you need to make box 40.61cm longer.

Naudio said:
and will that driver let me get 110db before reaching its 6.2mm xmax
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I don't know about this, as I haven't tested it outside with my SPL meter... I can tell you it's very loud tho, and you probably won't need to put more than 100W into if if you are in a shared house! 😉
Naudio said:
try playing some dubstep, will shake everything, loads of strong 30hz bass there. u gotta get a good track though cos some of it is abit dull sounding, try playing this lol

http://www.youtube.com/watch?v=ODyXPCmEAlI

and here is some radio, http://www.dubstep.fm/ its not all good but there is some class stuff there (FOR BASS FREAKS)
Click to expand...
I love the way he used as little of the Klaxons as possible. 😀 Dubstep is good for bass, particularly Kode 9 and Pinch... Dubstep.fm is pretty nice as the streams are quite high bitrate for an internet radio station (192). Also check out http://electronicexplorations.org/ for downloadable shows, I'm particularly keen on the Milanese mix.... :devilr:
 
#1,656
MaVo said:
Congratulations on your new sub, it looks like one can have fun with it 🙂

this is a little bit offtopic, but we certainly share a passion for the same music. Try Scorn / Mick Harris 😀
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Thanks! I'll check out Scorn, I think I have heard one of his songs on electronic explorations and it was pretty dark. :devil:
Brett said:
Measure the terminal voltage in use: I bet you're using a lot less than 100W.
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Just turned it up to war volume (glass shaking etc) and measures between 8-11v rms on the meter - I was expecting it to be a lot higher. That's amazing sensitivity, that's only around 15W!
 
#1,657
 
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