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Timber_MG
Registered User Joined: 27 March 2004 Location: South Africa Status: Offline Points: 1454 |
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hiphei: Is the horn overly unusual, or could Dan provide you with a
suitable (likely hyperbolic of sorts) approximation which was
approximated with conical sections and folded? Might be that the design
takes a little parameter drift due to coil heating into account. Don't
forget to take a line through the horn a little towards the outside of
the contre of the horn as the wavefront can be visualized as having a
"mass"-like property.
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hiphei
Registered User Joined: 09 December 2004 Status: Offline Points: 76 |
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I don't think it's overly unusual.. At least to my eyes. My sims just
show only peaks and valleys with original driver.. Huge peak at 65Hz
and below that the response sink like a rock. It's almost 10dB down at
40Hz.. The plans show that 35Hz should be -5dB. Also the one-way
excursion on my sim is about 22mm at 35Hz with only 300W of power. It's
so much off that i can't believe it could be due to correction of VC
heating..
The horn is just simple round folding (not S) and the driver sits in the middle of the baffle like eg. on rog's 186 horn. I feel so frustrated atm.. I already tried to contact Adireaudio last friday, but haven't yet received any reply. Hyperbolic flare makes the sims even more worse. The bump is even more severe and lies around 85Hz..?! I don't understand anything anymore.. edit: I did put up a thread in psw sub forum just in case someone over there was familiar with tempesthorn.. Edited by hiphei |
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mobiele eenheid
Old Croc Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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No, not that one. I would like to make a horn that can be used by every beginning and mediumsized drive-in's for up to (a serious) 200 people indoors. For most drive-in's a f6 of 40 Hz would be sufficient (it's also ment for just one a side). I'm working on a corresponding top as well. It will use 2 modules like Walt's M-horn (tho slightly improved me thinks ). Do you also respond on the forum or do you only read it?
I noticed I'm around.. You should try diyaudio.com instead. A lot of Adire fans hanging around there (Dan Wiggins and Tom Danley as well ) Which version of Hornresp are you using? I'm also getting differents results with 7.2 compared to 8. Remember Hornresp (and most other simulating prog's as well) simulate with a 3 dB-sine. Normal bass in music is more like 6 dB (dynamics). So 300 W simulated can get around 600 W in real-life. Personally I wouldn't mind about that anyway, since mnost horns get you 3 dB more output with half the power (compared to BR), so it isn't really limiting your SPL. Edited by mobiele eenheid |
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fernand
Registered User Joined: 06 January 2005 Location: Belgium Status: Offline Points: 24 |
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Any idea what has been changed/improved on Hornresp 8 ? With a bit of luck, my design results improve because Hornresp improves.
Edited by fernand |
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Timber_MG
Registered User Joined: 27 March 2004 Location: South Africa Status: Offline Points: 1454 |
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@ mobiele eenheid: Nee, ik lees net in het forum, maar mijn Nederlands is niet zo goed om erin te schrijwe.
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fernand
Registered User Joined: 06 January 2005 Location: Belgium Status: Offline Points: 24 |
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Timber_bg: Jou Nederlands is baie goed. Nie veel fout nie. (enkel schrijven) Beter dan mijn Afrikaans. Sorry guys: just to say that Afrikaans is quite close to Dutch. |
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Timber_MG
Registered User Joined: 27 March 2004 Location: South Africa Status: Offline Points: 1454 |
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Dank je wel. No faults in that Afrikaans. Afrikaans is partly derrived
from Dutch becasue SA was (initially) a Dutch colony and thus it is
quite similar to Hooghollands (high dutch from the 1700s). Flemmish
(seeing that you're from Belgium) is closer still (sounds it too).
Back to the topic. Try and see what ML Util gives you for good starting values and perhaps try and see whether you get close to your measurement results. Sometimes you can get good compromizes with less traditional flares though and some use refraction at folds to smooth out some behaviour higher up. |
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hiphei
Registered User Joined: 09 December 2004 Status: Offline Points: 76 |
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The designer of these horns was found from the Lab-sub board.. I also
found better datasheet for the original adire driver. So, i guess
the sims should now correlate more to original horn. Still the kappa's
seem to give better half space response at least down to about 50Hz
which suits me well.. In real room maybe even lower. I think that's enough for live application.
Thanks everyone for your replies! I think i really have learnt something! -Jani- Edit: Btw.. How would you decrease the back volume? Would polyurethane foam be stiff enough? Edited by hiphei |
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mobiele eenheid
Old Croc Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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Simplest way to decrease a volume is to place a board on the correct place (see 1850/186 horn). Cheers
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hiphei
Registered User Joined: 09 December 2004 Status: Offline Points: 76 |
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That was one of my options. Though i don't know how easy that will turn out since the cabs are already finished.
Unfortunately yesterday i had an accident. I stood on ladders (A-ones) and was painting a wall. The step under my feet fell off and otherwise i would've fallen too on the floor unless i hadn't been reaching to corner. The tip of the 'A' went through my rib and i got stuck on the ladders since my feet didn't reach the floor. An ambulance took me to hospital and at first they were scared that there were problems in my lungs or other internal organs because i had problems with breathing. I think i had good luck, since now it looks like that only the rib is broken. The doctor said that there *might* turn out some problems in my spleen later on. But i think it will be OK since i feel rather good now. It means that i'm at least 3 weeks away from work and hobbies. At least now i have time to play with hornresp.. -Jani- Edited by hiphei |
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mobiele eenheid
Old Croc Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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How easy it is depends on the opening/location of the backdoor, can you fit it in in one piece? Otherwise you can use multiple pieces (to form one piece) to do the job. It would even strenghten the construction in that way.
Sounds painfull
There should be a smiley there instead Good luck!
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hiphei
Registered User Joined: 09 December 2004 Status: Offline Points: 76 |
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Back in business again! Damn.. it took 5 weeks to get the rib in such
condition that i was able to go to work! I'm happy that i got away with
such a small injury! Ever since it has been one helluva hassle with
work and apartment, etc. We also managed to get the sound done for
biggest airshow in Finland last weekend.. phew! About 2,5km of cable,
29 horns and a bunch of trannies..
Since there is very nice/informative thread about LAB excursion going on at PSW (Not just LAB alone but there is also great links about simulations and high-power speaker excursion in general) i thought i'd link it here (just in case someone hasn't noticed it yet..). http://srforums.prosoundweb.com/index.php/mv/msg/6891/0/0/0 http://www.klippel.de/pubs/assesslargsign/assessing_large_si gnal_performance.pdf http://www.klippel.de/background/default.asp To Mobiele Eenheid: I think i will need to make the mod with smaller bites as You suggested! They need to fit through driver-hole! (Top cover is removable) I just hope that i'm able to get summer vacation during summer! Cheers, Jani |
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