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Unity horn build

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snowflake View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 14 March 2013 at 1:39pm
seems i'm suffering from something called high frequency fingering Shocked due to incorrect horn termination Big smile
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CoblosBrengose View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CoblosBrengose Quote  Post ReplyReply Direct Link To This Post Posted: 15 March 2013 at 7:05am
congrats snowflake
my project stage: drawing board Cry
drawing board
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4AC View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 4AC Quote  Post ReplyReply Direct Link To This Post Posted: 15 March 2013 at 10:45am
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
uǝɿɿɐʌǝ6ɯo sı ʇsʞǝʇ ǝzǝp
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bitSmasher View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote bitSmasher Quote  Post ReplyReply Direct Link To This Post Posted: 15 March 2013 at 11:09am
Originally posted by snowflake snowflake wrote:

seems i'm suffering from something called high frequency fingering Shocked


oh my LOL
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CoblosBrengose View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CoblosBrengose Quote  Post ReplyReply Direct Link To This Post Posted: 16 March 2013 at 2:20am
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil B Quote  Post ReplyReply Direct Link To This Post Posted: 17 March 2013 at 1:25am
Originally posted by CoblosBrengose CoblosBrengose wrote:

congrats snowflake
my project stage: drawing board Cry
drawing board


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
Mostly harmless.... except if catering is shut.

Solar Sound System Shennanigans..http://diyhifi.biz/
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CoblosBrengose View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CoblosBrengose Quote  Post ReplyReply Direct Link To This Post Posted: 18 March 2013 at 2:57am
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil B Quote  Post ReplyReply Direct Link To This Post Posted: 18 March 2013 at 7:20am
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.

Mostly harmless.... except if catering is shut.

Solar Sound System Shennanigans..http://diyhifi.biz/
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Steve_B View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve_B Quote  Post ReplyReply Direct Link To This Post Posted: 18 March 2013 at 1:58pm
Originally posted by snowflake snowflake wrote:

seems i'm suffering from something called high frequency fingering Shocked due to incorrect horn termination Big smile

Do you have any polar or on/off axis plots? I'm just curious how bad it is.
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snowflake View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 18 March 2013 at 4:41pm
Originally posted by Steve_B Steve_B wrote:

Originally posted by snowflake snowflake wrote:

seems i'm suffering from something called high frequency fingering Shocked due to incorrect horn termination Big smile

Do you have any polar or on/off axis plots? I'm just curious how bad it is.

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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve_B Quote  Post ReplyReply Direct Link To This Post Posted: 20 March 2013 at 11:36am

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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bwaslo Quote  Post ReplyReply Direct Link To This Post Posted: 20 March 2013 at 2:22pm
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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