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Unity horn build |
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snowflake 
Old Croc 
Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3096 |
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 Posted: 14 March 2013 at 1:39pm |
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seems i'm suffering from something called high frequency fingering
 due to incorrect horn termination 
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CoblosBrengose
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Joined: 09 December 2008 Location: Indonesia Status: Offline Points: 20 |
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Posted: 15 March 2013 at 7:05am |
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congrats snowflake
my project stage: drawing board   |
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4AC
Young Croc 
Joined: 18 September 2010 Location: Netherlands Status: Offline Points: 521 |
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Posted: 15 March 2013 at 10:45am |
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Wow very nice job on the Unity horns in Sketchup!
Would you be so kind to share the sketchup model with us? You can upload/export it to the sketchup models database... Cheers |
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uǝɿɿɐʌǝ6ɯo sı ʇsʞǝʇ ǝzǝp
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bitSmasher
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Joined: 23 June 2012 Location: Melbourne Status: Offline Points: 2289 |
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Posted: 15 March 2013 at 11:09am |
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oh my  |
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CoblosBrengose
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Joined: 09 December 2008 Location: Indonesia Status: Offline Points: 20 |
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Posted: 16 March 2013 at 2:20am |
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hi A4C
that's only artistic depiction of my imagination based on the published photo on the DSL website, not a scientific / accurate model. the internal geometry of synergy horn is kinda mystery to me. I'm still learning to grasp it.
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Phil B
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Joined: 21 November 2004 Location: Melbourne Status: Offline Points: 2313 |
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Posted: 17 March 2013 at 1:25am |
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Snap.... http://www.facebook.com/photo.php?fbid=600245400004843&set=o.126113687424773&type=1&theater Are you trying to back engineer from that photo? .p. Edited by Phil B - 17 March 2013 at 1:26am |
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CoblosBrengose
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Joined: 09 December 2008 Location: Indonesia Status: Offline Points: 20 |
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Posted: 18 March 2013 at 2:57am |
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Hi Phil
my drawing came first, I posted in diyaudio forum subwoofer section to illustrate 30 hz 6-fold TH designed by XOC1 in the March 12, and Ivan Beaver, the DSL lead engineer, released few days later on FB, March 15. I have purchased 8 Faital 12" few weeks ago. he use SH69 while my drawing is SH46-wannabe, which is narrower to allow 4 boxes to cover 180 deg. I must admit Mr. Danley is genius! the more I dug the more respect, how thoughtful his design is.
Edited by CoblosBrengose - 18 March 2013 at 3:02am |
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Phil B
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Joined: 21 November 2004 Location: Melbourne Status: Offline Points: 2313 |
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Posted: 18 March 2013 at 7:20am |
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Well here`s some more motivation for you.... we got busy today with our new prototype 3 way Unity...after doing a lot of reading and sims. It is a juggling act with Unities, whatever you do somewhere affects further down the chain. So after doing our mids we are hopefull we got the low mids right!
http://forum.speakerplans.com/topic63191_post763223.html#763223 .p. |
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Steve_B
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Joined: 29 September 2007 Status: Offline Points: 1587 |
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Posted: 18 March 2013 at 1:58pm |
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Do you have any polar or on/off axis plots? I'm just curious how bad it is.
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snowflake
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Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3096 |
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Posted: 18 March 2013 at 4:41pm |
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haven't got any plots but if i remember correctly was about 4dB dip about half an octave wide centred on 3.5kHz. clearly audible as you move from on-axis to off-axis. think I'm going to do a new prototype with bigger mouth and 60V*45H dispersion.
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Steve_B
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Joined: 29 September 2007 Status: Offline Points: 1587 |
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Posted: 20 March 2013 at 11:36am |
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 The generally accepted principle is to double the flare rate over the last 1/3 of the horn. The following diagram is taken from Keele's paper on constant directivity horns.  |
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bwaslo
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Joined: 15 May 2012 Location: Cincinnati, USA Status: Offline Points: 1 |
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Posted: 20 March 2013 at 2:22pm |
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I ran into a similar dip on-axis on my 90x60 DIY Synergies. I'm pretty sure it was coming from diffraction off the larger ports (nearly went away when I blocked the ports with thick plastic tape).
http://www.diygroup.com/forum/index.php?topic=19.msg895#msg895 - http://www.diysoundgroup.com/forum/index.php?topic=19.msg895#msg895 Edited by bwaslo - 20 March 2013 at 2:24pm |
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snowflake wrote: