Xtro flare redevelopement thread |
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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Posted: 15 April 2017 at 1:35pm |
So far I have the shape of horn as stl(in the link).
https://drive.google.com/drive/folders/0B5y23T8xURtGNmZwVlRsM3pmeXM?usp=sharing Still need to work on phase plug. I need help in measuring the speaker as on the images: Every 3 cm is good enough. Have fun. Feel free to check for mistakes. So far I know there is missing 1.8cm length in simulation on size of plywood in front of driver. Edited by gen0me - 15 April 2017 at 1:47pm |
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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Anyone has b&c 8pe21 to show or measure? In England?
Actually it should be enough to measure how far is the dustcap from front. |
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441 |
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i have some. i'll check tomorrow if no one else has.
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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What are you trying to achieve with the horn design? The sims you've done show a very wide dispersion and a change of 35 degrees in half an octave lower is quite sudden.
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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:) I have no goal tbh. Just something that will fit exactly Xtro, may be more universal.
Arent those frequencies where every horn gets directional? So is it good approach? |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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Not a well designed one, no. A good speaker has consistent pattern control to at least 800-1k, ideally lower. Otherwise half your vocal is immediately subject to reflections or comb filtering.
You would likely do better to decide your design goals and build to that. It would also help to have directivity plots of the HF and LF sections to ensure a smooth transition. I know of one builders' three way horn loaded cabinet that has HF exactly 60 but the mid horn starts at 90 and ends up at 160 by 400hz, and it's horrendous in multiples. Edited by toastyghost - 22 April 2017 at 12:34pm |
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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Here is the original one from https://freespeakerplans.com/forum/38-hosted-plans/5431-x-tro I see the problem. Conical horn seems to control dispersion better(smaller difrences in frequency change). |
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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Im a little confused. So what directivity should I expect? Like for http://beyma.com/getpdf.php?pid=TD245. Around 70 x 70 around 2-3khz. For http://www.bcspeakers.com/products/horn/1-0/0/me45 55x45 around 2-3khz. Whats the most popular hf horn than?
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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The XT8 is very hot on-axis above 1kHz, most likely due to the directivity at that frequency being determined by the initial expansion from the throat.
The original Xtro flare, being conical is actually much better in that respect.
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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Do you have any directivity characteristics? Basicly any info really appreciated. Im fighting here with abec http://forum.speakerplans.com/abec-problems_topic98514.html
I started even cooling processor with ventilator. Got so hot Im wondering xt8 was designed by try and makes methods or invented in some software? Or made partly as rough idea in hornresp and than perfected? Wider openning at the begging may be due to extending top of bandwidth around 2.2k. As I was simulating with hornresp I could go higher with Sentry around 170cm2 than 100cm2 Edited by gen0me - 14 May 2017 at 10:51pm |
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Mark James
Old Croc Joined: 15 January 2006 Location: rig side Status: Offline Points: 5309 |
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so a ce horn type thing [ie conical with the phase plug effectively makeing the first section exponential for loading reasons] might be an idea here then?
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me so horny me love you long throw
horn loaded for her pleasure |
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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I suspect there was a fair amount of guesswork and no simulation. I would concentrate on getting the dispersion right, frequency response is easier to fix with EQ... The original straight Xtro flare, plus phase plug as Markk says would be a reasonable starting point. When I was thinking about doing something similar, I wanted to try a Quatratic Throat Waveguide: Edited by ceharden - 23 May 2017 at 9:24pm |
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