B&C 8PE21 horn
Printed From: Speakerplans.com
Category: Plans
Forum Name: New Projects Forum
Forum Description: Forum for new speakerplans projects, in memory of Tony Wilkes, 1953 - 2014
URL: https://forum.speakerplans.com/forum_posts.asp?TID=102459
Printed Date: 19 April 2024 at 1:25pm
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com
Topic: B&C 8PE21 horn
Posted By: catalin
Subject: B&C 8PE21 horn
Date Posted: 26 August 2018 at 11:15am
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Hi everyone! Few bits done,more pics to follow https://postimg.cc/image/janlvu4x5/" rel="nofollow">  https://postimg.cc/image/547v0m1rt/" rel="nofollow">  https://postimg.cc/image/nwjq47lbd/" rel="nofollow">  https://postimg.cc/image/janlvukcp/" rel="nofollow">  https://postimg.cc/image/xh3cr3q2x/" rel="nofollow">  https://postimg.cc/image/fr1o62k7t/" rel="nofollow">  https://postimg.cc/image/fr1o61pcp/" rel="nofollow">  https://postimg.cc/image/3p6abwvjt/" rel="nofollow">  https://postimg.cc/image/kcxsefsw9/" rel="nofollow">  https://postimg.cc/image/sifucmjq1/" rel="nofollow">  https://postimg.cc/image/7ljm7xbeh/" rel="nofollow">  https://postimg.cc/image/wrkkers49/" rel="nofollow">  https://postimg.cc/image/qdvhbj2nt/" rel="nofollow">  https://postimg.cc/image/fr1o63msp/" rel="nofollow">  https://postimg.cc/image/6w0tvldft/" rel="nofollow">  https://postimg.cc/image/c7fqgbey1/" rel="nofollow">  https://postimg.cc/image/8ntsqk9o9/" rel="nofollow">  https://postimg.cc/image/9dcl2xhxl/" rel="nofollow">  https://postimg.cc/image/nwjq4cqi1/" rel="nofollow">  https://postimg.cc/image/oytwmw1ll/" rel="nofollow">  https://postimg.cc/image/66i1jbkmx/" rel="nofollow">  https://postimg.cc/image/o9b4ajvx5/" rel="nofollow">  https://postimg.cc/image/41xoi8qq1/" rel="nofollow">  |
Replies:
Posted By: Timebomb
Date Posted: 26 August 2018 at 12:49pm
Nice!  ------------- James Secker facebook.com/soundgearuk James@soundgear.co.uk www.soundgear.co.uk |
Posted By: concept-10
Date Posted: 26 August 2018 at 12:51pm
Excellent 
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Posted By: martinsson
Date Posted: 26 August 2018 at 3:17pm
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Great! I'm bringing out the popcorns for this one :) Great job in both craftsmanship and documenting it this far, maybe it's a bit early so ask, but if this proves to be successful would you consider sharing the plans? ------------- Swedish Pro-fi diy-nerd - http://www.martinsson.cc/blog/" rel="nofollow - http://www.martinsson.cc/blog/ |
Posted By: Dutchman
Date Posted: 26 August 2018 at 4:50pm
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Skills! ------------- We need more SPL! |
Posted By: catalin
Date Posted: 26 August 2018 at 6:58pm
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Thank you guys!! Keep you updated https://postimg.cc/image/gxjgab2ft/" rel="nofollow">  https://postimg.cc/image/odipw50ft/" rel="nofollow">  https://postimg.cc/image/nb8jdl9wp/" rel="nofollow">  https://postimg.cc/image/smnfyao9l/" rel="nofollow">  https://postimg.cc/image/kh5e04sax/" rel="nofollow">  https://postimg.cc/image/6nh1b2ka1/" rel="nofollow">  https://postimg.cc/image/4vo2g5drt/" rel="nofollow">  https://postimg.cc/image/ueget6s6x/" rel="nofollow">  https://postimg.cc/image/4iwoa238p/" rel="nofollow">  https://postimg.cc/image/nb8jdm4rt/" rel="nofollow">  https://postimg.cc/image/9ubkur9vt/" rel="nofollow">  https://postimg.cc/image/ipcf5altl/" rel="nofollow">  https://postimg.cc/image/9ubkus4qx/" rel="nofollow">  https://postimg.cc/image/qi32x9cd5/" rel="nofollow">  |
Posted By: concept-10
Date Posted: 26 August 2018 at 7:03pm
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loving this
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Posted By: TMH Music
Date Posted: 26 August 2018 at 8:13pm
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Now that’s some serious building skills!! ------------- Nothing is foolproof because fools are so ingenious |
Posted By: cravings
Date Posted: 26 August 2018 at 8:19pm
| incredible work again. |
Posted By: 4AC
Date Posted: 28 August 2018 at 10:17am
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Wow, stunning! I wish there was a build like this here every day... ------------- uǝɿɿɐʌǝ6ɯo sı ʇsʞǝʇ ǝzǝp |
Posted By: bob4
Date Posted: 28 August 2018 at 11:19am
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Nice! Intended frequency band?
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Posted By: catalin
Date Posted: 28 August 2018 at 11:56am
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hi there Well,with phase plug,500 to 2500 hz
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Posted By: JonB67
Date Posted: 28 August 2018 at 4:12pm
| Everyone loves a build thread! Stunning work. Looks like a labour of love. Really nice to have something unique! |
Posted By: catalin
Date Posted: 02 September 2018 at 6:59pm
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Neck reinforcement https://postimg.cc/image/4755qrmp5/" rel="nofollow">  https://postimg.cc/image/7dzpadzfd/" rel="nofollow">  https://postimg.cc/image/axln06ufd/" rel="nofollow">  https://postimg.cc/image/5ngo8bpft/" rel="nofollow">  https://postimg.cc/image/bzvtipxt5/" rel="nofollow">  https://postimg.cc/image/j33oyd5tl/" rel="nofollow">  https://postimg.cc/image/etyyw67p5/" rel="nofollow">  https://postimg.cc/image/w799b0nkp/" rel="nofollow">  https://postimg.cc/image/puu40mumx/" rel="nofollow">  https://postimg.cc/image/gn1vjxvah/" rel="nofollow">  https://postimg.cc/image/72i8x2do9/" rel="nofollow">  https://postimg.cc/image/nq9qzkg5l/" rel="nofollow">  https://postimg.cc/image/e5q4coyjd/" rel="nofollow">  |
Posted By: AndyWave
Date Posted: 02 September 2018 at 8:35pm
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mmm.....biscuits... Hats off to You, Sir Everyone here should try to make some compound angle bits on top of an other ------------- torturing electrons since ...... |
Posted By: catalin
Date Posted: 09 December 2018 at 5:36pm
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https://postimg.cc/tYxZ8G7r" rel="nofollow">  https://postimg.cc/JHyD19xz" rel="nofollow">  https://postimg.cc/hJq92Prb" rel="nofollow">  https://postimg.cc/Ny7RSqCh" rel="nofollow">  https://postimg.cc/8j9drbfY" rel="nofollow">  https://postimg.cc/tYZWyVvN" rel="nofollow">  https://postimg.cc/BtyPhnZL" rel="nofollow">  https://postimg.cc/jDyfnYbW" rel="nofollow">  https://postimg.cc/Vrv5R33W" rel="nofollow">  https://postimg.cc/k6HGhTC3" rel="nofollow">  https://postimg.cc/mtCk836J" rel="nofollow">  https://postimg.cc/jCGCH3vy" rel="nofollow">  https://postimg.cc/G4zc5XP7" rel="nofollow">  https://postimg.cc/FdkN1mM8" rel="nofollow">  Hi there!! Now,who has time and means to test and measure the freq. response of these? |
Posted By: JonB67
Date Posted: 09 December 2018 at 11:31pm
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Great work. Really impressive. |
Posted By: jazomir
Date Posted: 11 December 2018 at 8:31pm
Absolutely first class, beautiful work! I'd hate to have you say after this monumental and detailed build that after testing them that they sounded sh*T.  Please let them sound sweet!------------- For sidefills, can we have two enormous things of a type that might be venerated as Gods by the inhabitants of Easter Island, capable of reaching volumes that would make Beelzebub soil his pants. |
Posted By: odc04r
Date Posted: 12 December 2018 at 9:32am
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Very tidy work, great effort. |
Posted By: catalin
Date Posted: 09 January 2019 at 8:11pm
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Hi everyone, top flange done Paint is next thing to do https://postimg.cc/V0fyVG90" rel="nofollow">  https://postimg.cc/gLDSLGZn" rel="nofollow">  https://postimg.cc/tZtQDQ6H" rel="nofollow">  https://postimg.cc/gxwCQ6hs" rel="nofollow">  https://postimg.cc/qty9MVjC" rel="nofollow">  https://postimg.cc/MMwgnPF3" rel="nofollow">  https://postimg.cc/7b9r24D3" rel="nofollow">  https://postimg.cc/8fDXC7s2" rel="nofollow">  https://postimg.cc/t7Cm8xQ6" rel="nofollow">  https://postimg.cc/N9bC5gTL" rel="nofollow">  https://postimg.cc/KR3Qy791" rel="nofollow">  https://postimg.cc/7b6mKr0M" rel="nofollow">  https://postimg.cc/8s0w3Xb8" rel="nofollow">  |
Posted By: boots-hifi
Date Posted: 09 January 2019 at 8:26pm
| Epic building. Looking forward to following this post closely. |
Posted By: BP1Fanatic
Date Posted: 25 January 2019 at 4:42pm
| Killer build! |
Posted By: levyte357-
Date Posted: 25 January 2019 at 4:53pm
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What SP used to be about !! ------------- Global Depopulation - Alive and Killing. |
Posted By: boots-hifi
Date Posted: 25 January 2019 at 10:55pm
| Agreed Lev. To be fair the forum has been quite educational recently, as it should be. Some great knowledge being shared. Every days a school day. |
Posted By: Robbo
Date Posted: 25 January 2019 at 11:02pm
| I agree totally with all of the compliments above as it does seem ages since we had an epic build on here---But(theres always a but) I just had a thought that it may have been easier to make a jig and make them out of fibreglass, especially if more are going to be required in the future. |
Posted By: luthier
Date Posted: 25 January 2019 at 11:08pm
| Quality work there! |
Posted By: boots-hifi
Date Posted: 26 January 2019 at 12:05am
| Maybe fibre glass would of made sense, but let’s face it if you can produce wood work at this standard its an art form. I’d love to hear them! |
Posted By: MattStolton
Date Posted: 26 January 2019 at 10:14am
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Top skills, love a biscuit or two! ------------- Matt Stolton - Technical Director (!!!) - http://www.wildingsound.co.uk" rel="nofollow - Wilding Sound Ltd "Sparkius metiretur vestra" - "Meter Your Mains" |
Posted By: catalin
Date Posted: 26 January 2019 at 6:10pm
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Hi everyone! Most of my knowledge abaut sound sistems is from Speakerplans Forum,important is not to rush things,be patient and know your limits Allso is important to understand what you are doing , building something without know how is working is nonsens to me And,yes,great people araund here which share their knowledge (sometimes with to much patience!) Speakerplans is the place to be!! Thank you
!! |
Posted By: catalin
Date Posted: 27 January 2019 at 4:46pm
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Sunday play https://postimg.cc/wt7njm06" rel="nofollow">  https://postimg.cc/KRbXD4vN" rel="nofollow">  https://postimg.cc/McNNMpF1" rel="nofollow">  https://postimg.cc/0ztLvfGW" rel="nofollow">  https://postimg.cc/Z0ptN6Zn" rel="nofollow">  https://postimg.cc/XpkRH3r0" rel="nofollow">  https://postimg.cc/VJs32Tt0" rel="nofollow">  |
Posted By: studio45
Date Posted: 27 January 2019 at 5:01pm
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When I made horns like this years ago, I had a lot of trouble with the calculations for the compound mitre angles on the flare pieces. I didn't get it quite right and ended up with small gaps. Could you possibly explain how you worked them out? ------------- Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA |
Posted By: catalin
Date Posted: 27 January 2019 at 5:29pm
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Well,yes ,it is tricky,it was more like test and try I had to sacrifice few bits of ply ,till i get it right
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Posted By: bob4
Date Posted: 27 January 2019 at 5:46pm
One possibility is to cut slightly oversize and do the final trimming with a well tuned hand plane. You would be amazed at the amount of accuracy you get with a little bit of practice! |
studio45 wrote:Posted By: luthier
Date Posted: 27 January 2019 at 7:15pm
| I often cut compound mitres with my ts55 track saw, hand planes have their place, but they're not practical time wise if you're making multiples. |
Posted By: snowflake
Date Posted: 27 January 2019 at 8:41pm
you can calculate them using trignometry and I have done so in the past. I can't quite explain it without drawing it all out though - it involves multiplying the angles by cos or sin of the flare angles. there's a calculator on this page under 'general compound angles 2' http://jansson.us/jcompound.html" rel="nofollow - http://jansson.us/jcompound.html edit: for a square horn the bevel=45-(((invsin(cosAcosB))/2) how you do it for a horn with more than four sides I can't quite get my head round |
Posted By: doller
Date Posted: 28 January 2019 at 3:54am
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It's near impossible with a hand circular saw. They only bevel one way and it's always the wrong way. Cutting perfect matching panels near impossible. I am sure a few can do it. The best way is to make an angled cut off jig for the table saw. You can get exactly matching panels. But yes it does always take a bit of trial and error. |
Posted By: doller
Date Posted: 28 January 2019 at 3:55am
 I think the OP used one. And this is a really nice build loving the chunky look and the sp terminals. Very impressive. |
Posted By: luthier
Date Posted: 30 January 2019 at 2:03am
With a circular saw yes, difficult and not very repeatable. However I would choose a good track saw like the TS55 or Mafell equivalent over all simarly priced table saws I have come across. I can get the same accuracy and just as clean a cut with my TS55 as I used to on a Altendorf panel saw. It does take a bit longer to setup and I sometimes need to make a jig or two but it is an incredibly versatile tool that I use daily. Also as a side note, it's not difficult to cut past 47 degrees with the right setup, whichever side of the blade. |
Posted By: catalin
Date Posted: 11 May 2019 at 5:17pm
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https://postimg.cc/JtvFgvJY" rel="nofollow">  https://postimg.cc/grn5gmw6" rel="nofollow">  https://postimg.cc/CnBQ5sy4" rel="nofollow">  https://postimg.cc/hXq54m29" rel="nofollow">  https://postimg.cc/F7S6QpVr" rel="nofollow">  https://postimg.cc/pySNvpNZ" rel="nofollow">  https://postimg.cc/HrGfJRk8" rel="nofollow">  https://postimg.cc/fJSGRDDh" rel="nofollow">  https://postimg.cc/k2Fh25HL" rel="nofollow">  https://postimg.cc/Lq9QLpK5" rel="nofollow">  https://postimg.cc/06VWCBPf" rel="nofollow">  https://postimg.cc/YGVd5L4L" rel="nofollow">  https://postimg.cc/5jY7wgGB" rel="nofollow">  https://postimg.cc/sQ1nH42R" rel="nofollow">  Finaly paint is done!! https://postimg.cc/N2HdBGTJ" rel="nofollow">  https://postimg.cc/0rTtZmRL" rel="nofollow">  https://postimg.cc/K4MfKzkQ" rel="nofollow">  https://postimg.cc/zVYjTrTN" rel="nofollow">  https://postimg.cc/xk8y9TVv" rel="nofollow">  https://postimg.cc/GHPjQ5jy" rel="nofollow">  https://postimg.cc/Hrp9P9SP" rel="nofollow">  https://postimg.cc/sMw4FGqf" rel="nofollow">  https://postimg.cc/ZvpxX7tX" rel="nofollow">  |
Posted By: concept-10
Date Posted: 11 May 2019 at 6:17pm
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stunning
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Posted By: catalin
Date Posted: 12 May 2019 at 8:51am
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Almost finish! https://postimg.cc/t1FjX9Xv" rel="nofollow">
 https://postimg.cc/75F485yT" rel="nofollow">  https://postimg.cc/R69zh2hS" rel="nofollow">  https://postimg.cc/yDgKbF2H" rel="nofollow">  https://postimg.cc/jnS0QNyB" rel="nofollow">  https://postimg.cc/wyVYmFRh" rel="nofollow">  |
Posted By: Contour
Date Posted: 12 May 2019 at 10:16am
| no damping added? Try to get hold of some ‘twaron’ |
Posted By: catalin
Date Posted: 13 May 2019 at 6:21am
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I will ad some,and do some measurements with and without damping. |
Posted By: JonB67
Date Posted: 13 May 2019 at 7:42am
| Awesome looking job! |
Posted By: luthier
Date Posted: 13 January 2020 at 11:01pm
| Love it, they look great. |
Posted By: angus
Date Posted: 28 November 2023 at 11:53pm
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Awesome work on these horns! I am planning something similar but much simpler - more like the xtro mid horn section. What method did you use to fill in the corner transitions from the baffle to the horn mouth here: https://postimg.cc/jDyfnYbW" rel="nofollow">  Also, have you managed to test them and get some feedback on the design/approach? If they sound as good as they look they will be great!
------------- They're complaining over there, but it's their fault! |
Posted By: catalin
Date Posted: 29 November 2023 at 2:52pm
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Hi there! Very happy with the sound of the horns. Sharp,fast and plenty of spl. For those corners i used first wood chips mixt with glue for rough shape,after rough sanding i aplied some saw dust mixt with glue. Final stage ,some fine wood filler an fine sanding. You need to have big patience,it is time consuming. Before ewerything,i create a mesh from wire and some fine screws .
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