From the designer:

"Here is a new design I have just completed.It is based on the famous Tapped Horn as discussed by Tom Danley.This design offers many advantages in terms of efficiency compared to a reflex but also mainly in its "musicality".

The idea for this box came to me after discovering Tom Danley's MiniTH, I ahve always been impressed by its products.

IN NO WAY is this design a MiniTH copy(I don't even know the internals of the MINITH anyway).This plan is 100% original, based around a specific driver and the design is very close to the MINITH performances.

The inspiration for the design was to make a small enclosure, with a inexpensive, but quality 12" (DIY spirit) able to compete with a 15" reflex.

The enclosure is based on the Precision Device PD.12SB30.Efficiency is 100.5dB 1w/1m in Half-space (2pi), cutoff 52hz at -3dB.

I recommend 15mm seing how small the box is, should make for a very light cabinet adapted to mobile djs, or bigger PA with multiple enclosures..."

Hi, whats the recommended xo on this design? Cheers

I would like make this project... (Sorry for my bad english i'm italian) Could i use this project for outdoor small partyes?? And what is the SPL could it make??
Please answer at my question...

benvenuto. Un'altro italiano

Ciao!!! Sono contento di non essere l'unico! Secondo te quanto SPL posso ricavare da quel progetto?? E per che musica sarebbe adatto??

.......A

Just one c o r n e t t o.
I'll get my coat

mines a mint choc chip

+1

from my rusty italian I get:
"Hi, happy not to be the only one here.In your opinion:how much spl can one expect from this design and what type of music is it best for?"

I will email the designer and ask for more info on this project.

you sure you didnt use google translate.........

just a quick sim...maybe usefull
TH mode
s1 138
s2 210 con 16
s3 759 con 124,9
s4 825 con 17
s5 870 con 17

atc 840
vtc
cone volume+6520

ap
284

lpt
wood thickness

I'm not sure about the last horn part....the driver occupied a lot of space so...s4 would be around 411

cheers, bitzo

Thanks, But what is the SPL???

we have to wait the designer reply but if you are in hurry, hornresp is your friend.
But to me is wiser to wait....sim is useful but the real testing and build is the real answer.

ok... thanks

Here is the Simulation, straight from the designer:
[attachment=1]simuhornresp.gif[/attachment]

And a picture:
[attachment=0]wp1c2c4890.jpg[/attachment]

Very usefull!!! Can you make a video of this sub?

GiveOrTake could you ask for the input screen for HR? Just for addicted to sim like me

thanks alot man but can this enclosure be used in live applications and the spl?

give or take, please could you ask the designer for some closer shots of his build? also info on the handles as the placement suggests a 45deg (or similar) corner piece which is not noted on the plans. unless i am missing something?

thanks
mikey

hi give and take

could you please post hr inputs. i want to try it with my 12


thanks

ravs


be a vegeterian

Just got the panels cut for two, start assembly tomorrow. I Will try to get some pictures up. One question tho- is the polarity reversed for drivers in this cab?

got one done, sounds good
BTW- those cheap cheaplights.com drivers work well.

I'm jealous, too cold to build still. Brr

Nicky- It's cold here in michigan too... gotta build in the basement when the kids are gone.

TO THE DESIGNER- GREAT CAB DESIGN!!!

I have built a pair of these and loaded them with some cheaper drivers, these to be exact-> http://www.cheaplights.com/cart/page81.html (the first 12" on the page).
I tested one after i got it together and was impressed, then i built the other and was pretty much amazed.
This pair was not only louder than my 18 reflex cabs, but also much clearer and more defined. I am not a math whiz, nor do i know how to use most of these modeling programs, but this driver seems well suited in this cab. (TS parameters are impossible to get, have tried for weeks, and i dont know how to get my own.)

Plan on building two more, as i have another pair of these drivers.

thanks to the designer!

would really love to build 4 of theese for hire outs.can only afford cheap drivers to though so i'm gonna try either fane sovereign 12 -500 lf or 12 -300,although the 300 has the closer paremeters to the pd strangely.i thaught it would have been the other way round.was a bit scared of building them and putting wrong drivers in but after what you said mautopsy i can't wait.will post pics and you tube vids when finished.bigup!!:@)

it seems that it is a very forgiving design ,and a range of drivers might work. Very easy build, home depot did all my cuts, and assembles very easy.

Out of curiosity how would it work if you increased the entire cabinet 25% and used a 15" instead of the 12"? Longer horn path should go lower. Could someome work it out and sim it in hornresp. I assume that it would only work well with the right driver but it might be worth the test.

There are already designs available for 15" drivers just do a google.

Tony

TDA Audio has a bunch of TH designs 15" and 12" I believe. and i think Stapier has some too

[attachment=0]MTH-30 simu.gif[/attachment]

From the designer:

"Concerning the 45 deg:if it is about the "corner pieces" the MTH-30 does not have, 2 opinions:
-some think they are vital
-some think the opposite, as can been witnessed with url=http://www.volvotreter.de/th.htm]http://www.volvotreter.de/th.htm[/url], or with Danley's (which patent doesn't contain any).

My position is that up to a specific size, "corner pieces" can help reduce some velocity trouble.Unfortunately I have not performed test proving it.
One thing is certain though many proven design TH or TQWT seem to perform without the need of any."

-sorry for the approximate translation english is not my mother tongue-

many thanks give or take! i wil post pics of the 4 i'm building next week.

cheers
mikey

edit...

Hi all, newb here about to get into this plan.

I need a small light (ish) sub box that has focused, punchy lows for little club type live gigs, and this looks to fit the bill.

Couple issues for me, one specific and one general

1) The driver listed is a UK manufacturer, which creates all kind of problems for me not the least of which is the expense of getting one here, does anyone have an idea what Eminence/JBL/EV/B&C/ etc etc might yield a good result? I have a relationship with B&C, but even then they are still kinda spendy....

2) I note the plans assume a lot of knowledge that I don't have. I'm very good with making things work, but I need some place to start in terms of the simple mechanics of building boxes. For example, I know I want to use Baltic Birch, but I don't know if I should be screwing them together or gluing, or where to put the handles, how to finish the box (love to have some sort of coating that would withstand some ass-whipping), jacks mounting, corners/hardware etc etc.

Any pointers?

Thanx - WB

Found something, whaddya think?

http://www.speakerplans.com/index.php?id=guide

that is a very good guide to get you going. the other option for wood is MDF, although if you plan on touring and having crew fling your boxes on and off trucks regularly then birch is the answer.
regarding the driver, PD have distributors world wide so it may be possible to get the 12sb30 where you are.
screwing and glueing is a must, read that guide you posted carefully and it will give you all the info you need to build this box.

hi all,
just a quick sketch...


and an akabak sim

cool! any idea what this does to excursion?
i like the idea of the modular horn although you are doubling the size of the box for a little more low end response. makes it not so compact anymore. would multiples couple like FLH's, or does this remain a typical tapped horn?

Nice bitzo, i happen to have two of these cabs sitting around.....and some extra wood.....maybe some time. I like this because you can stack a commercial 12" or 15" Midtop on top, and this raises it a bit more, and we don't have to use those silly tripod stands

here's 400w
may be too much for pd12sb30 or it's a peak to peak measurement? akabak manual isn't so clear.... tapped horn as well

cheers, bitzo

Bitzo, any ideas for clamping this together? Don't think we need to be as crazy as rog's modular design. Would case clamps hold this, or even the weight of a mid top on top of it?

Some scketeches for clamping....you have only to drill some holes in the horn mouth then put some tnut. On the mth30's frontal pan panel don't drill for all the depth just to screw in the stuff (I don't know the english name) in the photo, then bolt. However ye olde ratchet strips may be, can work good.
Also...in the addon mouth some braces would be nice.

Getting ready to build 2 of these, where do you guys like to get your hardware (jack plates, corners, handles, speaker cups etc) ?

Ebay

Yeh, I've been looking there, kinda all over the map, that's why I was diggin for better options, but it could work.....did you ever take pics of the ones you built, and are you pleased?

Thanx....

If you're in England. Adam Hall in Southend on Sea.

love em, i used the 12" drivers from cheaplights.com and they sound good.
still gotta do some finishing on the cabs, but here is a picture

Cool!

@Tony - nah, SoCal, I'm sure there's great places around here for this stuff, I just don't know where...

WHat does anyone think about sticking an Eminence Lab 12 in this box? That thing is a pretty great sub woofer, but maybe not in this box....? Or maybe so....

STACKING QUESTIONS:
Ok all the smart guys out there. does it get better if the horns are coulped like the photo i have drawn (mspaint)?
[attachment=0]MTHStack.JPG[/attachment]

or would they better benifit with the driver near the ground, or up. Height is not my concern, just wondering what is the best approach

afaik tapped horns do not couple like a front loaded horn. so there's nothing to be gained by stacking them a particular way

So should the mouth open near the floor, as to use the floor as a horn extension?

I would think that lining multiple cabinets up with the mouth close to the floor would give the best coupling taking full advantage of the 2PI space.

The PD 12sb30 has a good Xmax for a tapped horn (7mm) and according to hornresp will reach x-max at about 46Volts which is 265W at 8 ohms.
No one has mentioned that you will need a hi pass filter and it will probably be to be at least 40hz.

I use these drivers http://www.cheaplights.com/cart/page81.html (the first 12" on the page) they are Cheap, work great and are very similar to the Radian 2312s. I do not use a high pass. these cabs are rather great, allowing a hell of a sound that one man can set up. I Use two currently and may build two more, but my Servodrives want to get out and see action as well and i must divert the funds to repair a few of them.

would the eminence lab 12 work in this design?cheersryan

Hi Guys,

first, excuse me for my bad english

second, I'm searching a cutlist for this design: i haven't software to draw it then I can't realize this project.

can you help me?
if anybody has draw it, can post it? I think that I can be very useful for all !!!


thank a lot

c'mon lazy paisà! you just need inkscape will and time.

My MTH-30 Sketchup Model :

P.S.: If you want this Sketchup Model please PM Me!

Can i use 14mm plywood or this will affect the performance?

How high does this cab go to with the PD driver. It says from 42Hz. would it make a good kick cab?

Hello

Plan said nothing about bracing.

What panels should be braced ?

if you look at the first photo after the plan, you can see what and where to add bracing...... hope this helps.

Ok, i see that, but what about unbraced side near horn mouth?

Anyone know how low 1/2 will go in 1pi? also how high is everyone crossing these?

Cheers

The pic of the MTH-30 on the plans page is my !

good job Geko...... How have you found this cab so far......

It's a very good cab... Mine is loaded with RCF LF12G301. It goes surprising low ! It's a SUB and i need a kick bin because my tops are only 2 8" ...

Best Regards, Giacomo.

Greetings all!

I think I've found a suitable driver, made here in the US (and a bit cheaper then the PD)

Eminence Definimax 4012HO 12" Driver:
http://www.parts-express.com/pe/pshowde ... tab=2#Tabs

Specs:
*Power handling: 600 watts RMS/1,200 watts max
*VCdia: 4" *Le: 1.17 mH
*Impedance: 8 ohms *Re: 5.85 ohms
*Frequency range: 49-2,500 Hz
*Magnet weight: 109 oz.
*Fs: 46 Hz
*Sensitivity: 94 dB 1W/1m
*Vas: 2.1 cu. ft.
*Qms: 5.74
*Qes: 0.38
*Qts: 0.35
*Xmax: 6.2 mm
*Dimensions: Overall Diameter: 12.38", Cutout Diameter: 11.06", Mounting Depth: 5.32".

Can someone more well-versed in HornRESP model this? I happen to have a couple of these drivers that need to be reconed sitting here, if it sims well; I'll build a bunch!

If someone is thinking about modeling the 4012, would they mind modelling the Delta 12 lf as well? I have 2 on hand, and although I love them in my T30s, I just built some T48s, and I want a nice small box to throw the d12lfs in.

specs are

Resonant Frequency (fs) : 51Hz
DC Resistance (Re) : 6.06
Coil Inductance (Le) : 1.45mH
Mechanical Q (Qms) : 7.28
Electromagnetic Q (Qes) : 0.51
Total Q (Qts) : 0.47
Compliance Equivalent Volume (Vas) : 67.9 ltr/2.4 cu. ft.
Peak Diaphragm Displacement Volume (Vd) : 243cc
Mechanical Compliance of Suspension (Cms) : 0.19mm/N
BL Product (BL): 14.1 T-M
Diaphragm Mass inc. Airload (Mms) : 51 grams
Efficiency Bandwidth Product (EBP) : 100
Maximum Linear Excursion (Xmax) : 4.8 mm
Surface Area of Cone (Sd): 506.7 cm2
Maximum Mechanical Limit (Xlim): 13.5 mm

I have finished test build of this box.

More info here:

http://www.mymagicsound.com/my-mth-30-build/

My advice. When you do another build stay away from chip board.

Yes. I have had some on hand, but now know all reasons why to avoid this junk.

Next build will be with proper plywood, catted precisely with table saw, joined with biscuits, and finally properly routed.

Ok, sims for friends

[attachment=1]4012ho.jpg[/attachment]
Spl chart

[attachment=0]4012ho-disp-300w.jpg[/attachment]
Displacement at 300w

i would say no too suitable:

[attachment=1]delta12lf.jpg[/attachment]
Not too flat

[attachment=0]delta12lf-displacement-100w.jpg[/attachment]
Very low displacement limited power

Hi fellow bass builders,

After a few months of testing and gigging with 2 MTH30 cabs, I decided to build 4. Two of them are active, supplied with 2channel Hypex plate amps. For the tops I use DB F12 cabs.

During testing I compared the 2 mth30 to one EAW600 (215) of a friend. The eaw has rounder (basreflex) lows and throws omni, the MTH30 have a strict cardoid-like pattern, and they have more output on axis, certainly 10m distance. I'd say up to 20meters you have usable coverage in my opinion. I tested them on a bridged Crown K2 (2400w), but felt like that amp (compared to the hypex plates) has such an enormous 40hz output, even with processing it shakes the woofers up to xmax way easier than the hypex do (at 'same' volume off course). As these cabs are not really made to provide hefty 40hz, I decided not to stress 'm that much, the Hypex amps do a good job at that.

Most gigs I play (piano and vocs) and provide sound are quite small (1piano and 1guitar round 100people), but sometimes gigs turn out (arriving at the place) to be outside for 600people (in setting with drummer and sometimes a bass player). So I needed a system that's easily transportable and provides output for those occasions. In my previous setup I blew up my woofers three times over...
For the small gigs I'm happy to work without a heavy amp rack and have extra mains power output on the back of the subs.

I haven't had the chance to hear the new system outside with drums, but judging the output while playing CD's I think it'll work fine. They still need grills tho...

Nice work

Nice! I love my MTH-30!

here's a few i knocked up before xmas... they have proven to be pretty good bins for drum and bass. love how portable they are.







i'm liking the use of the active module in the above post. are these available in the uk? the mth30 is so light that it could stand to have the extra weight of the module built in, doing away with amp rack, making them even more portable. that way one could fit everything for a little dj gig into the back of an estate. 4xmth, 2xtops, cdj coffin, poles, cables etc, maybe even a few lights!

Hi cudds, great job on your cabs! Did you use four clamps to secure the grill? No shaking?

The hypex amps should be available in the UK too, I believe their webshop sends internationally. They are very lightweight BTW. I built them into the wheelplates.

From my experience these cabs work best in larger environments, in small pubs I've had some strange issues with lots of bass on stage, without really developing elsewhere (there it just felt like pressure, but not really like bass). That was with two cabs, 4 should give more. Caused by the horn effect? Is this familiar to anyone?

where the cabs sitting on the stage, or on the floor infront of the stage..... and was the stage constructed with a wooden floor or a concrete floor.....

yes lots of shaking! it was a complete blunder not installing wooden mounts for the grills, but i was in a rush. they will be changed before their next outing.

It was a portable (wood with alu rigging) stage, around 50-60cm heigh. The subs were placed right next to it, with front of the sub in line with front of stage...

it could of been rearward base waves echoing under the staging..... Ive heard this issue when ive see people putting there subs on the stage area.

Hi. Answer is boundary and cancellation modes. This subs behave like horns, except there is nothing to be gained by extending horn path. Good explanation can be found here:http://billfitzmaurice.info/forum/viewtopic.php?f=1&t=398

The overall dimensions of the MTH-30 seem to be 68 x 34 x 57.7 cm.
According to the construction plans the outer panels are included in those dimensions.
However, the width of 34 cm can't be right, because the 12SB30 won't fit in a space of just 31 cm.

What's the matter with this? Is the overall width 37 cm while the height and the depth are correct?

Help me out, please!
Thanks!

The overall width is 37cm, while the height is 68 and the depth is 60,7 (All with 15mm thick panels).

Best Regards, Giacomo.

Okay, thank you!!
So the description is not completely adequate, I assume.

And I suppose you are sure about it, having built at least one, but the depth is 60,7 yes?
When I look at the construction plan, I can't find external panels to make the depth 3 cm larger than the 57,7 cm.
For it says the height is 65, but then without the top and bottom.
With the depth it really says 57,7 when I look at it

the plans are correct. outside dimensions of the cab are ...depth 57.7cm width 68cm and height 37cm

Sorry, i've made a mistake !
The external depth is 57,7 and not 60,7 .

Best Regards, Giacomo.

Okay, thank you!

Also my bad, I had just seen the plans on the hosted plans section and had not yet opened the Full Size Plan in de attachment.

Is there anything similar but for a 15"?

Google 15" tapped horn

the martinsson tham15... http://www.diyaudio.com/forums/subwoofe ... -horn.html
almost same dims as mth30 but 150mm wider.
i actually have one which was built for testing available for not much cash

cudds, do you / have you used these cabs together? if so, were there any issues?

i have a/b tested them although the tham15 was loaded with a driver that does not perform as well as the specified b&c 15tbx100. there wasnt much in it but can believe that with the b&c driver the tham15 would wipe the floor with the mth. i dont think there is anything to be gained in using them together as the tham15 will play just as high as the mth.



black- mth30 pd12sb30
grey- tham15 b&c15tbx100

on a bang for buck ratio i think the mth would win every time, but the tham15 is only a little bigger, can handle 3 times as much power and plays lower (but will also be 3times more expensive!!)

Some plots of other drivers that could work. Mind your power tho, i have blown one of my goldwoods before
[attachment=0]jblandgoldwood.jpg[/attachment]

Grey- Goldwood GW12090
Black- JBL 2206H

Has anyone testet real life this enclosure, MTH 30, compared to an 18" BR speaker ?
If anybody did that, say what was the difference between them ... I know that from the simulation , the MTH is way more louder, higher SPL. I;m interested if this is exactly the result in real life...
The same with Cubo 12 against an 18" in BR, but in real life compared.
Thanx a lot ! ! I;m waiting for your replys

I use four. Great cabs

4 cabs MTH 30 with what loudspeaker ? Pd 12DB30 ?
Have u compared 1 by 1 with an 18" BR speaker ? If u did, with what 18" woofer ?
thanx

goldwood's. yes a/b tested. leaves most single 18" bass reflex in the dust. there is no cubo 12 or mth 30 showdown. the mth30 was designed for a certain driver, and a few others work in it. the cubo was designed to accept a wide range of drivers, ask the designer about what drivers you plan on using and he will help you out.