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Fibre Glass MT121 Horns.
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adambomb View Drop Down
Old Croc
Old Croc


Joined: 10 April 2006
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    Posted: 15 May 2007 at 10:26pm
Hi All,
 
As some of you may know I am looking for some mid / top for my so far entirely SP rig (4 x X1s and 6 HD215s).
 
I have been going in all sorts of directions with this so far:
 
1. Buy SH Turbo, Martin, EAW etc horn loaded mid tops. (looking at around £500 per box)
2. Buy Dodgy Chinese knock offs. (shipping costs and general "bad vibe" about this.. around £500 each agian, but brand new).
3. Build MT121s. (the amount of work involved and therefor cost for me seams to be very high.. and I may want 6 in the end so may cost more in the long run).
4. Buy Fibreglass horns... but the prices are soo silly ranging from £350 - £200.. way too much for what it is.
5. Make Fibreglass horns... and build a box to chuck em in.
 
So...
 
The last option seams to me a great way of learning a new skill... and totaly in keeping with the SP ethos (IE home made - could be repeated by any member).
 
So far I have looked at the tooling costs (making the moulds)... which come out at around £250... (that includes making a plug, the casting a mould from that, then making a gloss plug from that mould)... plus a little diy time with some filler.
 
I have also looked at the production costs.. which are suprisingly low! (massive profits made on these items from pro audio retailers.. massive!).
 
This would include 3mm fibreglass, renforced where nescecery, flanges and bowls to put over the drivers (probably have to drill them to suit driver)... basicaly ready to chuck in a box.
 
Personaly I think this might be the way to go... and might also help a few other SP members with there mid / top needs... for far less than they could get them elsewhere.
 
I'm going to go ahead with the project I think (unless a cheap set of TSE 111s or THL 811s come in the near future).
 
So... on the back of this.. if it happens... I will be able to supply a complete fibreglass horn for around £60!! (that's near enough cost price)
 
So anyone up for fibreglass MT121 Horns? Is this a good idea? Lemme know you thoughts people!!?!?!
 
Would Rog mind???.. I'm not exactly doing it for the money, Rog will know there's no mark up on that price, just enabling other peeps to make use of my moulds really.
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ceharden View Drop Down
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Points: 11776 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2007 at 10:59pm
The MT122 is a compromise horn to enable it to be made out of wood at all.  If you're going to go to the trouble of making a fibreglass horn, you might as well spend some time refining it.  Eg making it more circular or even think about a phase plug of some kind.

I've been thinking about doing this for some time but have too many other projects on the go.  I'd certainly be interested in some flares and having some input into the design if you want?
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adambomb View Drop Down
Old Croc
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Joined: 10 April 2006
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Points: 3220 		Post Options Post Options   Thanks (0) Thanks(0)   Quote adambomb Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2007 at 11:16pm
Please Please Please.!!!..
 
This is exactly the response I was looking for.. this could be the SP communitys poor mans porn?
 
Having your help would be fantastic!
 
I would have a go at HornResp myself... but I'm a total newb.
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ceharden View Drop Down
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Points: 11776 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2007 at 12:28am
Excellent.  Will drag out some of my previous investigations.

You are going to need to learn Hornresp!  Download it, the help section is quite useful.  Start by simulating the MT121 as-is with your driver of choice then start playing with the throat, mouth, length, flare type and see what happens.

I would like something which has a dispersion of about 60x40deg and is usable from about 160Hz to ideally a crossover at 1.2kHz.  I'm using two direct radiating 12" drivers at the moment but would like to move over to a single horn loaded.
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Rockin View Drop Down
Young Croc
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Joined: 02 April 2007
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Yeah i'd be up for some too.

Hope this project comes off
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mykey View Drop Down
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Points: 9680 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mykey Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2007 at 7:58am
4. Buy Fibreglass horns... but the prices are soo silly ranging from £350 - £200.. way too much for what it is.
5. Make Fibreglass horns... and build a box to chuck em in.
 
[/QUOTE] www.janaudio.net  m212  £300.00 a pair

Edited by mykey - 16 May 2007 at 8:00am
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biotec View Drop Down
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Points: 2932 		Post Options Post Options   Thanks (0) Thanks(0)   Quote biotec Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2007 at 9:56am
It would be quicker (and more c*ntish) to reverse mould an existing fiberglass horn (martin, turbo, funktion, eaw, etc) and base yours on that.

Edited by biotec - 16 May 2007 at 9:56am
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Richard Hart View Drop Down
Young Croc
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Originally posted by mykey mykey wrote:

4. Buy Fibreglass horns... but the prices are soo silly ranging from £350 - £200.. way too much for what it is.
5. Make Fibreglass horns... and build a box to chuck em in.
 
www.janaudio.net  m212  £300.00 a pair [/QUOTE]
 
£300 a pair!!!
 
That's a bargin Mykey! I imagine if you loaded those horns with a couple of the P audio neos they'd rip your head off!
 
What will those horns go down to?
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adambomb View Drop Down
Old Croc
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Joined: 10 April 2006
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I have seen the Jan Audio ones... and they look great, but they are double 12".. I want single.. and I think (!?!) most other people do too... and that's still £150 each.. which equates to almost 3 times the cost price.
 
I know Jan Audio make a single 12" with a comp mounted in the mid horn... but these are a bit more pricey.
 
About reverse engineering another horn... could be done, but I think the end result would be better with an original mould... and it's also far more SP to build our own ay!
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adambomb View Drop Down
Old Croc
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Joined: 10 April 2006
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Points: 3220 		Post Options Post Options   Thanks (0) Thanks(0)   Quote adambomb Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2007 at 10:31am
Ceharden.. I have HornResp.. I will start where you suggested.. your freg response and dispersion requirments sound perfect for me too.
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adambomb View Drop Down
Old Croc
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Points: 3220 		Post Options Post Options   Thanks (0) Thanks(0)   Quote adambomb Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2007 at 10:32am
Anyone got suggestions on drivers... keeping costs reasonable ('m thinkin something from P.Audio).
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ceharden View Drop Down
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Points: 11776 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2007 at 10:37am
@Mykey:  We've also been waiting a very long time for you to put some more detailed specifications on the Janaudio site.  Ideally full response and polar plots would be nice but just an idea of the frequency response and the nominal coverage angle would be a start.
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