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  1. This is the long delayed single driver sub similar in design to the Skhorn. Overall the performance goals and criteria were quite similar. Big surprise there! The Skhorn works so well at what it does that I didn't feel the need to reinvent the sub for this one. This is primarily designed as a professional sound reinforcement or live sound style subwoofer. Big output and clean sound in very big spaces, while covering the typical bass heavy range of music, has always been the primary mission for this sub. Same as it was with the Othorn and Skhorn. It can and I'm sure WILL be employed for other t
    9 points
  2. Final quarter of 2017 update. JTR Speakers Captivator 212Pro results have just been posted. KRK Systems 12S2 subwoofer testing is done. Should be posted next. WW Speakers / Mark Seaton designed X21 cabinet loaded with B&C 21DS115-4 driver testing is done. Will be posted ASAP as well. This was tested with both vents open and with a vent plugged and with both the Powersoft K20 and an Inuke 3000DSP. That's 4 full measurement sets. We're killing a lot birds with one stone on this one. We have some information on the Inuke 3000DSP amp driving a real load. We have the 21DS115-4
    9 points
  3. So close. Loading drivers and doing the wiring today
    8 points
  4. Ok... report after 3 full days of Skram use. Josh, thank you for this amazing design! I am simply blown away that this kind of performance can be had through diy designs, you are doing the music world a huge service with your knowledge and plans! I do feel I need to apologize if I created any doubt in my previous posts about the low frequency output of these things.... a stack of 4 center clustered with all the mouths centered to each other create just a crazy amount of output, they blur your vision and make your voice change haha! After the feedback from earlier discussions I added s
    7 points
  5. Update to powering the RF 19's. The 8 sealed in the HT will now be getting a pair of SP2-12000's. Each 6k module power 2 1ohm T3S1-19 drivers in series in a dual opposed sealed cab. This switch is mostly because the SP amps have less fan noise than the K20's. Also they have slightly better extension below 10Hz. The K20's are going to the band spot to power the MAUL's. Fan noise doesn't matter there. Each MAUL has 4 T3S1-19's wired in series for a 4ohm nominal load and will see a whole bridged K20. Yay headroom... Got power?
    7 points
  6. Blowing out the cobwebs today
    6 points
  7. Been almost 3 years in the making. Huge undertaking. Just finishing up the last few features but we're closing in!
    6 points
  8. I've got a couple of pro woofers on hand for 2018 so far. I need to do some more testing with the 21DS115-4, but I also have a JBL 2269H 18 and 2 18Sound 21's the 21NLW9601 and 21ID. I also have a couple of vented pro subs I didn't get to in 2017. Even more JTR Speakers testing is on the schedule for when spring gets here.
    6 points
  9. Kong: Skull Island (Dolby ATMOS) Level - 4 Stars (111.38dB composite) Extension - 5 Stars (1Hz) Dynamics - 5 Stars (28.84dB) Execution - TBD Overall - TBD Notes - This film delivers bass in spades, especially in the shake-and-move-stuff wheelhouse range of 12-25Hz. Clipping analysis shows flat tops in nearly every channel, Center is most egregious, but all the clipping appears to have rounded edges as if some sort of limiting was put in place like Pixels, so not completely objectionable, like Tron:Legacy clipping was. LFE channel clips with sharp corners, but lo
    6 points
  10. I just attached the plans to the first post for anyone that wants them. I've had 3 or 4 other people request these plans over in Europe. Hopefully there will be some more documented builds coming up.
    6 points
  11. Othorn files. OTHORN print AUTOCAD 2000.DXF OTHORN DXF scale print.pdf OTHORN print.pdf
    6 points
  12. Hi everyone! I'm new to this forum, after beeng very active on different forums here in Norway. Over the years I've built and restored about 200 different cabinets for speakers in my small workshop, and my latest one is the Skhorn. I've also built six Othorns, but these Skhorns are among the largest cabinets I have done. I built three, two for a customer and one for myself. All the parts are cnc'd out of 18 and12mm BB at a friends workshop. I think the build was relative easy compared to the Othorn. I'm going to use the Ipal driver, and will start testing tomorrow with a Crown Itech 6000 am
    5 points
  13. I don't see myself doing many TH or FLH's in the future. FLH makes more sense for systems without size restrictions, looking to extract maximum from a single driver and those without the need to go very deep. I might employ it for 80-300Hz range or so in the future but it's doubtful I'd do a subwoofer. 30Hz extension is bare minimum for something I consider a "sub". FLH's can be bested in the lower register by smaller more output dense alignments. They can sound very good. TH's I've found that the limited bandwidth and limitations imposed by path length needs and folding options cause them to
    5 points
  14. Bolserst is a long time contributing member over at DIYAudio forums. He has developed this spreadsheet that will take an impedance measurement and calculate the complex inductance of a driver. David McBean the author of HornResponse has added the capability to simulate using this data into HR. This is a much more accurate way to simulate and design speakers and subs. In short if you are designing bass systems using modern, high power, long throw drivers and you are not accounting for complex inductance in your modeling; The models are probably not representative of what you would be build
    5 points
  15. I've seen it, even posted in the thread. There are many ways to fold this style of cab up. There are a couple of other ones floating around also. Other than that I try not to comment on other people's designs too much. Many times they aren't ever built, or if they are there is never any reliable objective results shown. Who knows. In other news I have picked back up on working on a single driver version finally. I've basically got the cab layout and fold nailed down. I just need to decide on bracing and hatch then put the models and print together which takes a bit. Hopefully I'll have it
    5 points
  16. 5 points
  17. Agreed...There have always been a lot of hang ups with terminology in audio circles and fixation on defining things by a strict set of rules. In order to be an IB the back volume must equal at least 10X VAS...Waveguide vs horn etc... I consider the Skhorn a hybrid 6th order design. Fun fact...Skhorn is pronounced like the word scorn and I gave it that name because after exploring all the options I could think of attempting to do a horn of some type, I ended up not doing a horn at all. No matter how much I wanted to, and I really wanted to make a horn at first, I simply could not make
    5 points
  18. I vote that we let users add graphs, content, build plans, etc. 1 guy can only produce so much content. As far as social media I'll let you guys in on a secret. I've never been active on any form of social media. I don't plan to be either. From what I recall Kyle isn't either. That's why we don't have any of that for DB! Neither one of us wants to deal with it!
    5 points
  19. I've mentioned it a few times before. A pair of JBL 4675C's. The 2226H drivers out of the double 15" (4508A) bottoms I sold off and replaced with AE TD15M-4 drivers with the Apollo upgrade. They are wired in series. The big 2360A "butt" lenses still have the 2446H CD's on them. Those sit on top of the MAUL's. It is a tri-amplified stereo system run from a Peavey mixer into a DCX2496 which provides processing and routing to the amps. The current amps are a 20 year old Mackie M1400i on the 2446H drivers (Run from about 600Hz up.), a Crest 8002 powers the TD15M's which run about 80-600Hz roughly
    5 points
  20. No offense to RF as they do have some sharp guys but the whole, driver optimized for sealed / vented / BP and don't use it in another alignment, is for the most part antiquated thinking from back before modern signal processing. There are drivers that are better suited to some jobs than others make no mistake, but this is not one of those. Usually the reason you will hear that drivers are not suited for sealed is the qts is too low (IOW too efficient) and without EQ it will be bass shy because the top end gains sensitivity quickly and overpowers the low end without EQ. In this case RF is assum
    4 points
  21. It's hard to believe, but I've finished my subwoofer - global pandemic be damned. It seems like it took forever, but at some point you just have to stop. Painting the box the way I did greatly increased the time it took. Leaving it square & painting it with truck bed liner would've saved me weeks. No matter now. Here's the finished box. Just so someone will know I painted the bottom the same way... here's the bottom. Because I have a dual 2 ohm voice coil driver, I wired it in series. I ran one wire to connect the negative of one coil & the positive of the othe
    4 points
  22. Na, they are in our studio with the big Danleys. Had about a dozen friends over last night for a listening party with the new Tool Album. Holy shit! I am continually blown away with these Skram subs. Danny Carey's drums sounded so immense! kick drums right in the soul haha! In all seriousness we collectively agreed that none of us have ever heard kick drums sound this good out of a soundsystem. Made for a super memorable night, fuck going to concerts lol!
    4 points
  23. Wow! What complete and utter rubbish. I'm not going to question the author's reputation as a mixer, which may or may not be well deserved, but most of what's written there is embarrassingly wrong. It's hardly unique to the author. He's just perpetuating myths that are widespread throughout that community. These myths come about because people are trying to relate their subjective experiences with sound to objective principles, without sufficiently understanding the latter. One of the worst issues I see are that he blames "muddy sound" on rooms being too small for the wavelengths. Th
    4 points
  24. It’s not how I will normally deploy them... but figured they should hang and and get to know each other https://imgur.com/gallery/r5UkOor
    4 points
  25. The output power of a K20 vs an X4 K20: 145 V RMS for less than a second at 2.05 ohms both channels driven Then it limits to 58 V then it goes down to 52. This means 10.5 kw per channel for long bursts 1680 watts for 4-10 seconds 1350 watts per channel for almost a minute then thermal protection. Similar output is offered at 2.5 ohms , 70 V RMS for 4-10 seconds. This time constant depends on the internal temperature. The X4 can do 2950 W for 2 seconds at 4 ohms, then 1600 watts per channel at 4 ohms for 20 seconds single channel. 2*2650 w for 0.8 seconds then 950 watt
    4 points
  26. For anyone who might find it helpful. Attached are cut lists to build 2 skram cabinets. I tried many combinations of 4x8 and 5x5 to find the route with the least leftover waste. Factoring in cost of materials for me in Canada, $73 per 18mm 5x5, and $105 per 18mm 4x8, this was the cheapest route... your mileage may vary depending on material costs. Will require 6x 5x5 of 18mm and 1x 5x5 of 12mm costing about $487 Canadian. I used the Cutlist optimizer app. All pieces are accounted for as rectangles, some finish cuts will be required after the fact Skramcutlist18mm.pdf skr
    4 points
  27. It's been ages, but I've finally gotten a fix for the "stacking" problem in the latest MSO version. An article (PDF) that I recently found detailed how to impose global constraints in the Differential Evolution algorithm without causing convergence problems. I implemented it and it seems to be working well so far.
    4 points
  28. Some progress shots. We have decided to do a shoot out between the B&C 21SW152, RCF LF21N551 and 18 Sound 21NLW9601. I will share the measurements and results in a couple of weeks.
    4 points
  29. Finally some pics of the assembly process. The MW's of @lilmike are finished on Wednesday.
    4 points
  30. Going back to my issue with the drivers in electrical series, I can say there is absolutely no difference between them linked like that or parallel. All my tests and measurements showed me nothing changes, a small voltage difference is present, but only 1-2 V at 60 V sines.
    4 points
  31. fwiw this release can show the bass managed result of a set of filtered channels in the app, updates live as you change filters and reports on headroom available - https://github.com/3ll3d00d/beqdesigner/releases/tag/0.5.0 I recommend using a decimated track if you want this to perform acceptably so that means it isn't a perfect simulation, close enough though for this purpose IMO
    4 points
  32. I looked at the sim and it is quite close below 80Hz. This one should have less efficiency and less output above 40Hz on paper. It should have a bit more output near tuning. I'd say the original sims as being the slightly bit louder cab overall for music apps or live sound (kick drum, percussion fundamentals, most of the content being above 40Hz etc.). I've found over the years I like smoother responding wider bandwidth systems vs systems optimized for more sensitivity over a narrower band of operation. This is part of the reason I decided not to do a straight slot. I wanted extra up
    4 points
  33. The idea behind this build is to learn. I started my company to sell subs, because here in this part of Europe, there is a very deep lack of powerful high quality bass Mostly I wanted to see people's reactions, the power density, the extension, to see if the weight and dimensions are a big problem. They are now installed in a basement where we got them by hand. I wanted to see about the power compression, port noises, chuffing, I have learned how and why to install protection grilles, handles, wheels, I wanted to see if I can improve their performance in any way without any othe
    4 points
  34. I got myself a Powersoft K20 for these and tested them at full power for 20 hours,the amount of power and the stability that amp has is way way higher than what the clone or the Crown could ever dream off. I set the limiters and processing and I installed them in a small club for further long term tests. The deep end is imense. I have a pair of xoc1 TH18, we got 2 Vs 2 with their own processing and limiters on a K10 and the 2 large SKHorn got +10 dB on a 2 minutes average pink noise dBz and +18 dB at 30 Hz .
    4 points
  35. Here is a RTA of thunder I took with my calibrated-to-4hz Dayton EMM-6 and a TASCAM US-1641 which starts dropping off at 20hz. The mic was inside a window behind the curtain with its windscreen on and SPL is uncalibrated but it clipped my mic just when it hit that peak at 4hz, and I had my mic at 3/4 of gain, so it was a pretty loud peak. The second image is with no smoothing was taken during the RTA. The first has 1/48th octave smoothing and is the total peak. I live far out in the country so there are no sources of infrasound from vehicles or factories except for a very low level 14hz tone f
    4 points
  36. Make sure you put a finish on the cab before you install the driver. I have had cabs that went without finish for 3 years, b/c after the driver goes in, it is so easy to just listen to it. JSS
    4 points
  37. The Incredible Hulk is still the track I compare all others to. A close second is the Star Trek reboot, War of the Worlds, and all of the 5-Star films on the first page of the thread. For lots of 20Hz and below energy, Battle:LA is hard to beat as well. JSS
    4 points
  38. So after reading this thread over the past year and amazed and the technical depth and extreme attention to detail paid to the tuning of this system and going "man I really want to hear this!", I flew and went to check out this system. And boy what an amazing system to listen to! My mind was blown as I was amazed by one thing after the other. All the work put into getting the tonal balance of this speaker correct really paid off big time. The whole system just sounds really "correct", and the more I listen to it the more I'm amazed by it. I brought my Reference Mini's with me as a compar
    4 points
  39. Gjallarhorn 2 plans. GH 2 print.pdf GH 2 print.DXF
    4 points
  40. Ok. I had a look in HR. It had been awhile. I'd recommend a 3rd order BW at 24Hz or a 4th order LR HPF at 21Hz. This is for operation with all vents open. 4th order LPF adjusted to taste for blending with the mains. Somewhere between 50-120Hz. 70-100Hz is probably what would work for most. The response looks quite good with just the high and low pass added. This is the response with the 21SW152-4. Most of the other recommended drivers are going to be close to this as well. If you want to take it a bit further You can add a single band of PEQ at about
    3 points
  41. It's my dad's and my shop, yes. The biggest benefit is that my recording studio and my equipment storage area are in the same building. Plus everything is well isolated (acoustically) so that I can work way past midnight without anybody caring. The CNC was the latest addition to the shop last summer and it has easily been the most used machine in the room ever since 😊 It may look spacious, but it really isn't. There are machines everywhere!
    3 points
  42. Hi Everyone, I have taken @dsl1 files from page 15, edited them to test the fitment of everything on my laser scaled for 5mm and 3mm thick birch ply. I have made a few minor adjustments so far and created a good assembly test setup 6.5" wide, 10" tall and 9" deep. I have ordered the handles, T-nuts and Duratex from Parts-Express. I have to say I really like the updated design that eliminates all of the multiple bracing pieces in the original design files and combines them into larger single pieces for faster assembly. I plan on changing some of the joints on my files so that the edges int
    3 points
  43. Port and horn divider/braces are all 12mm. I don't use T-Nuts on any of my subs, just screwed in. If it strips rotate the driver and screw to a new area. Works for me, I never had to rotate it yet.
    3 points
  44. Sorry for the late reply, just getting back online after a vacation. The 4th order recommendation was based on simulations of the performance of lower-order filters. The lower-order filters do not provide sufficient protection from overexcursion below the horn's tune. Once at 4th order, things look OK, higher than 4th looks a bit safer, but as SME mentioned, higher-order filters come with other issues, like ringing and phase issues. That was all done in simulations, which are predictions of large-signal performance based on a set of small-signal parameters that do not scale linearly
    3 points
  45. git clone git@github.com:3ll3d00d/beqdesigner.git cd beqdesigner git checkout 0.0.2-beta.2 python3 -m venv beq . beq/bin/activate pip install numpy colorcet scipy qtpy qtawesome pyqt5 matplotlib ffmpeg-python soundfile resampy cd src/main/python # you also need ffmpeg and libsndfile1 installed, e.g. sudo apt install ffmpeg libsndfile1 then open mpl.py in a text editor and change the following change for k, v in cc.cm_n.items(): to for k, v in cc.cm.items(): (this is due to some lib having an older version in pypi vs conda, it is fixed in next release) then python3 app.
    3 points
  46. Just completed the Skhorn and just want to say thanks to @Ricci Never had so much fun firing it up for the first time. Everything in the house shaking and my 10 year old saying his chest "feels weird" Don't have much of a reference to compare to, only had two 15s before this. To say this is a giant leap forward, would be an understatement. Very impressed with the sound sonically, it's pounds, I have the volume at 50% with one bridged side of my inuke nu4. I had to back off or I start breaking my wifes stuff. Can't imagine how it performs with a great amp. Thanks again f
    3 points
  47. Ready Player One BEQ (Both UHD and BD have ATMOS tracks, this correction was applied to the 7.1 channel bed) All effects that need to gain power/heft do so. I like this BEQ, and this film. Correction: LFE: Gain -7dB Low Shelf 16Hz, Slope 2, +5dB Low Shelf 16.5Hz, Slope 2, +5dB Low Shelf 17Hz, Slope 2, +5dB Low Shelf 33Hz, Slope 0.5, +2dB Highpass 6dB/oct 3Hz LCRS: Gain -7dB Low Shelf 15Hz, Slope 1, Gain +5.5dB (3 Filters for total of 17.5dB) Highpass 6dB/oct 3Hz Let me know what you think, and if y
    3 points
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