oohms Posted January 25, 2023 Author Posted January 25, 2023 Here we go again, I felt like making another pair and loosely followed the work i had done for the first version 4 1
santodx5 Posted January 29, 2023 Posted January 29, 2023 Hi. Can you share the size and thickness for front panel? Thank you
Rrobot Posted January 30, 2023 Posted January 30, 2023 (edited) Looks awesome!! Bit of an upgrade in your workshop too ... Impressive stuff!! Edited January 30, 2023 by Rrobot
Grizaudio Posted January 31, 2023 Posted January 31, 2023 (edited) On 25/01/2023 at 5:27 PM, oohms said: More progress shots Nice wood working skills. After listening to music with JBL dual diaphragm JBL D2430K compression drivers/M2 waveguide 5025594, its very difficult to go back to separate domes/drivers. Compression/Waveguides done right is very difficult to beat. I can only image these in finished form & equalised sound amazing. Edited January 31, 2023 by Grizaudio 1
davewantsmoore Posted January 31, 2023 Posted January 31, 2023 On 5/3/2019 at 10:48 PM, JLOP said: with a cutoff frequency in the 150-200 Hz This horn is big (1m x 0.6m) but it is not really big enough for such a low frequency. Depending on the specifics of the driver, it will probably be very happy in a horn with a slightly higher Hz (like ~350Hz) 1
Grizaudio Posted February 1, 2023 Posted February 1, 2023 5 hours ago, davewantsmoore said: This horn is big (1m x 0.6m) but it is not really big enough for such a low frequency. Depending on the specifics of the driver, it will probably be very happy in a horn with a slightly higher Hz (like ~350Hz) there are so many awesome waveguide options off the shelf these days. And with modern wideband compression drivers like those from Celestion and B&C (DCX464) low crossover points around circa 300-500hz can be achieved quite easily. I believe these are commonly used in K horns?! nice example: https://www.bcspeakers.com/en/products/horn/1-4/0/ME464 Seems to have good control down to about 450-500hz.
oohms Posted February 1, 2023 Author Posted February 1, 2023 More build photos.. they were finished in about a week, just in time for the triple J countdown I have them actively crossed over at 500hz to a pair of faital 15pr400s. The small tweeter horn isn't connected, it was part of a previous build. 9 2
davewantsmoore Posted February 1, 2023 Posted February 1, 2023 That person who look like they're leaning on the speaker in the photo, you could almost fool me that it's me (anyone else could definitely fool them) ... there's a lot to like about these pictures. Very nice. Cats Poang Vinyl Nice shop Suntory Atmos Is that a subwoofer built into the cabinet on the left? ... and is that large absorber above it? 2
Rrobot Posted February 1, 2023 Posted February 1, 2023 This is awesome!! Bet they sound tremendous in the backyard! Just need an outdoor cinema screen for when the sun goes down (and a few more suntorys ) 1
oohms Posted February 1, 2023 Author Posted February 1, 2023 13 minutes ago, davewantsmoore said: That person who look like they're leaning on the speaker in the photo, you could almost fool me that it's me (anyone else could definitely fool them) ... there's a lot to like about these pictures. Very nice. Cats Poang Vinyl Nice shop Suntory Atmos Is that a subwoofer built into the cabinet on the left? ... and is that large absorber above it? Thanks! Yep there is a lot going on, and some day i should post more about my other setups. Indulgent is a good word to describe it all This is what the night descended into: https://youtu.be/7M017lEwRwk 1 1
Rrobot Posted February 1, 2023 Posted February 1, 2023 1 hour ago, oohms said: .. have them actively crossed over at 500hz to a pair of faital 15pr400s. The small tweeter horn isn't connected, it was part of a previous build. I'm peering at your rack of gear and can't see a driverack or anything like that, curious to know what you're using to cross them and whether much filtering/delay magic was required in DSP? Great work, very inspiring!
oohms Posted February 1, 2023 Author Posted February 1, 2023 3 minutes ago, Rrobot said: I'm peering at your rack of gear and can't see a driverack or anything like that, curious to know what you're using to cross them and whether much filtering/delay magic was required in DSP? Great work, very inspiring! I'm using a DBX driverack PA2 because it's so quick to set up and auto eq compared to the behringer DCX. Once i build the bass bins for these, i'll try designing a passive crossover 1
Rrobot Posted February 1, 2023 Posted February 1, 2023 (edited) 8 minutes ago, oohms said: I'm using a DBX driverack PA2 because it's so quick to set up and auto eq compared to the behringer DCX. Once i build the bass bins for these, i'll try designing a passive crossover Yeah, nice! The 2496 is a bit of a PITA isn't it. I have to crack out REW with mine and I still haven't got the hang of it. I'd love a PA2.... the Chinese clones look pretty tempting but a massive gamble. Bass bins? Ye gods!! You're not mucking around dude. This is getting interesting! Edited February 1, 2023 by Rrobot
Mark_Hathaway Posted February 3, 2023 Posted February 3, 2023 Lovely work oohms. This is a speaker design I’m intimately familiar with. I’ve heard one speaker design I like as much, a mates three way, line array LF and mids, two meter tall ribbons. My main system uses KPT-402-MF and KPT-GRAND-HF. There is no valid Tractrix horn patent, the patent was granted to PAUL GUSTAVUS ADOLPHUS HELMUTH VOIGT in 1926, it has long since expired. Klipsch has the trademark for the name Tractrix, which is a seperate, odd feature of IP law, not something an individual would like to challenge the Vox group on. I would liken this granting of a trademark for the term Tractrix to someone being granted the trademark for “wheel”, but I am not an IP legal expert, a mate of a mate is and he loses me as quickly as I lose him about horn design. https://worldwide.espacenet.com/publicationDetails/biblio?CC=GB&NR=278098&KC=&FT=E&locale=en_EP The K402 is also dimensionally identical to the KPT-402-MF. The hifi K402 variant has been used in two way and three way variants, most commonly two way. The horns mouth width, its maximum inner horizontal width, is approx 855mm. 855mm corresponds to the half wavelength of 200hz, which is where the horns loading falls off a cliff. You don’t cross over this low, similarly to avoiding a direct radiators primary resonance point by a good margin, it’s best to avoid a horns rolloff by 1/2 to 1 octave. The KPT-402-MF is used in the largest of the largest commercial cinema speakers, with a 400hz 4th order LR crossover using IIR filters executed in DSP as a midrange, crossed to the HF around 7000hz. Pushed to the diaphragms rated power of either the genuine K1132, the p-audio or FaitalPro equivalents, diaphragms last 5-8 years when pushed to 350 watt peaks has been my experience. The 400hz xover point is necessary to avoid diaphragm over excursion, reducing power levels allow the xover point to come down, 300-350hz sounds great. With less than 20 watt peaks, 1st order even works. Let’s not forget this is a truely genuine 111 dB 1 watt 1 meter in 1 sphere efficient horn/driver combo. 3
Andrew Tilsley Posted March 7, 2023 Posted March 7, 2023 (edited) From one horn builder to another, congrats. Paul Klipsch really knew his stuff. This horn was one of last hurrah's, couple to the Jubilee bass bins. I couldn't think of a more dynamic and fun speaker. Have you considered the Jubilee's? Also check Volti Audio (Greg Roberts), who's modded the Jubilee into a "Jamboree". I like the promo pic with lady from the Klipsch factory. Why not try a B&C driver which can run down to 300/350Hz? You've put all that hard work into the horn. If it's crossed at 500Hz, then the horn could be a lot smaller, thus wasted. The B&C DXC4464 co-ax driver is even better. My mate's Altec two-way with huge Mantaray (similar to your), plus 360 litre Onken with Altec 416, was probably the best system I've ever heard. I built a 200Hz horn (in white, see pic) using an Altec "Giant Voice" 300Hz compression driver. Unfortunately, I didn't have active DSP/xovers to play around with this, otherwise it would have been a fun project. I used CNC'd MDF slices to create the large tratrix curve. Andrew Edited March 7, 2023 by Andrew Tilsley 9
mfforever Posted April 2, 2023 Posted April 2, 2023 WWWOOOOWWWW ! ......... your woodworking builds are just amazing .... lovely to see such skill and dedication is still alive ..... and can only drool at what they would sound like ...... alll the best.
Full Range Posted April 2, 2023 Posted April 2, 2023 On 7/3/2023 at 2:05 PM, Andrew Tilsley said: I like the promo pic with lady from the Klipsch factory. Not sure but I think I read somewhere that is Mrs Klipsch in the photo Yes they are that big - photo at the Klipsch factory 2
mfforever Posted April 2, 2023 Posted April 2, 2023 The above, for mere mortals , these are indeed Stonehenge artefacts of the Audio Gods. ......... I wish I had a converted church with soaring ceilings so as to let these behemoths soar !
oohms Posted May 15, 2023 Author Posted May 15, 2023 Bass bin time! The plywood for this is lightweight falcata ply, almost like balsawood, so bracing is important. I decided to make a frame out of pine and glue the plywood sheets onto it Ports made from 90mm stormwater PVC, and threaded inserts for the woofers You know things are getting rushed when No More Gaps becomes the adhesive of choice, but it does work well as a gap filling adhesive Sound absorbing closed cell foam out of K-mart exercise mats 2
oohms Posted May 15, 2023 Author Posted May 15, 2023 Fly screen to stop critters from making a nest inside Stacked together for the first time: The bass bins weigh about 25kg each loaded, and each stack is just under 90kg.. not bad for the size 4 2
oohms Posted May 15, 2023 Author Posted May 15, 2023 Prepping and painting, using wall paint to blend the boxes into the room a bit Threaded inserts to hold the stack together Fitting blocks to the bracing, to have the woofers sit just under 1mm proud, to use the woofers as part of the bracing Making a rudimentary plinth to center the whole stack between floor and ceiling 2
oohms Posted May 15, 2023 Author Posted May 15, 2023 (edited) Back to the horns, 3 layers of french polish painted on One layer of single coat oil based polyurethane Painted the rear part Edited May 15, 2023 by oohms 2
oohms Posted May 15, 2023 Author Posted May 15, 2023 Cut out coupling panels out of that acoustic pin board material Designed and printed a throat adapter. I should have kept the throat opening the same aspect ratio as the mouth but this will be good enough Going to test a couple of compression drivers, so far the JBL 2453J is my favourite for this setup Crossed over actively at 500hz they sound amazing so far. Just need to finish the second pair of bass cabs and start designing a passive crossover 3 1
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