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Ricci

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Everything posted by Ricci

  1. Ricci

    Ricci's Gjallarhorn & Othorn Files

    Solidworks or E-Drawings Pro.
  2. Ricci

    Ricci's Gjallarhorn & Othorn Files

    I see I missed this question. How many TH-18's does DSL recommend? That'd be a good place to start. I'd think 2 per side would be a good start. 4 per side would be a whole lot more fun though.
  3. Ricci

    Ricci's Gjallarhorn & Othorn Files

    I don't know what the problem is. I just opened every file linked above without issue. Perhaps try to contact someone who has already downloaded and built from the plans. Maybe their file will work for you.
  4. 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 building. Previously you would need to purchase costly software in order to derive and simulate using these parameters, or figure out a way to roll your own way. The spreadsheet imports a text file of an impedance measurement and calculates the complex inductance specs. Additionally if you have an added mass or Vas (Known air volume) impedance measurement you can also import it and the spreadsheet will calculate all driver parameters needed for modeling. A driver file can then be exported for use in HR. Semi-Le_Calc_V2.zip
  5. I hear that Mike...Way more ambition than time eh? I know that story. I second the caution to watch the SC input level. It's easy to smoke one with an amp. I'm using an old Crest 8002 with a blown channel that it isn't worth it to fix. Does just fine with the 1 good channel sitting on a test bench though.
  6. Ricci

    Ricci's Skhorn Subwoofer & Files

    Sine sweep SPL value is not a peak figure. None of the ones shown here are peak. Crest factor is 3dB.
  7. Here's the design I'm going to be using to replace my Othorn. It's been "almost" done for a long time now but I finally made an effort to wrap it up to the point that it is ready to build. Originally I was going to go with another TH design I was calling the Palehorn to replace the Othorn but I wasn't quite happy with it. I stumbled on this type of cab a few years ago while doing a billion simulations of different cabinet designs. You can read some of that in the M.A.U.L. thread. I originally planned to try this design first since it was smaller and cheaper to produce but circumstances led to the bigger more complicated M.A.U.L. getting done first. Since this style of 6th order bandpass / horn cab worked quite well and on target with the bigger design, I used what was learned there to make a few tweaks to this and finally wrap it up. I'll add a lot more info later, but here are some pics to start with. If anyone feels froggy and wants to have a go at building one of these let me know and I'll send the plans. Simplified design layout. Add bracing, drivers, hatches, hardware to taste. PDF and DXF Plans Skhorn 221 print.pdf Skhorn 221 print.DXF
  8. Ricci

    Ricci's Skhorn Subwoofer & Files

    Hmm. Man I think its splitting hairs. Should be fine. Your talking a couple hertz tuning difference if that. The vented chamber is relatively forgiving of small changes. Id say roll with it.
  9. Ricci

    Ricci's Skhorn Subwoofer & Files

    Simple mod...how much longer did you make them?
  10. Ricci

    Ricci's Skhorn Subwoofer & Files

    Ouch blown amp stages...I've had similar happen with unbridged smps amps. This is partly why I avoid running them like this for heavy duty bass now. It seems to shorten the life span quite a bit and induce more failures. Most of the pro amps I've used seem to be fine on bass duty, half bridged until down around 25 to 30Hz with normal duty cycle music. Lower impedance loads / higher current requirements/ higher sustained power and especially very deep bass frequencies below 25Hz start to cause issues. With usual music primarily above 30Hz you may never notice. I go straight to bridged for subs anymore to avoid the possibility under demanding circumstances. YMMV.
  11. Ricci

    Ricci's Skhorn Subwoofer & Files

    I did some quick modeling and it looks like the tuning would come in at about 31.5 or 32Hz from the original 28 or 29Hz tune. A little more than I had guessed, but the response doesn't change much. It looks good. I'd say this modification would be barely noticeable if both were side by side and you have a little extra vent area. Go for it.
  12. Ricci

    Ricci's Skhorn Subwoofer & Files

    If the extra 60mm is added to the vents only it would raise the tuning a bit. I'm not sure how much exactly but I don't think it would be more than a couple of hertz at most. Probably not a big deal. I would mainly use the rms limiter and leave the xmax and voltage limiter set out much further. The drivers mentioned here typically will not actually damage themselves mechanically without severe abuse and they audibly let you know first. Also with the standard tuning and a high pass below 25Hz it will take a ton of voltage to induce over excursion. Peak voltages I'd likewise leave set way out. The cab will take it for short term peaks. The main concern is long term heating up of the coils so the rms limiter should be the biggest focus. The Linea's look good but I don't have any experience with them yet. Seems like they are getting popular. Looks like that would be a good choice to run 4 Skhorns (or more) per amp. With 4 ohm drivers you can wire 2 channels bridged for a rated 10Kw into a pair of Skhorns.
  13. I would recommend using an amplifier for large high power woofers. However you don't need to run it as hard as you might think. 1 to 3 volts is plenty. The main thing is load invariance, linear response and freedom from clipping. If you cannot get an amp try to use a good quality headphone output these usually have a better result driving low impedance loads and a bit more current capability than a line level output. Things like the DATS can work in a pinch but the drive level is only a few milli-volts. It's not enough for accurate repeatable measurements on the types of drivers I usually test. IMHO.
  14. Ricci

    Ricci's Skhorn Subwoofer & Files

    All speakers have inherent differences in power handling vs frequency. Its assumed that any serious outfit would work out limiting or amplifier matching depending on content/ use, amps and drivers for their individual case. It depends quite a bit on all of these factors. I can say that with my pair I've beat on them hard and haven't had any issues but I'm not banging off the clip / limiter for 12hrs with extremely compressed content either. YMMV. If you have the ability to do true long term power averaging I'd set it to somewhere between 500-1500w depending on drivers to be truly safe but that is a absolutely huge amount of average power with typical music crest factor. Way more than it seems. If you are matching the amp rating to the recommended driver AES power rating range and not exeeding it or running consistently into the limiter it shouldn't be a concern. Running a 9kw rated k20 channel for all it is capable of into a single 21ipal loaded Skhorn with a driver power rating half that wouldn't be recommended. Some common sense is needed. Running about 2 to 5kw of amp per cab depending on the drivers used and application is about right. The amps would be clipping or limiting the peaks well before the average power is reached with normal music.
  15. Ricci

    Ricci's Skhorn Subwoofer & Files

    18sound should work also, either the 21id or 21nlw9601. RCF lf21n551 Looks workable. Whichever of these 21's is most cost effective should work well for you. I've never had any trouble with burning up drivers in the Skhorn. Don't think anyone else has. Its got 2 drivers with the highest power handling ratings on the market and a decent air volume and air exchange rate. This was also part of my goals with the design. It will take quite a bit to overheat a pair of 1800w AES rated drivers. Unless you are talking about running a whole bridged amp on each one I wouldn't worry about it.
  16. Ricci

    Ricci's Skhorn Subwoofer & Files

    We will know that this summer.
  17. Ricci

    Ricci's Skhorn Subwoofer & Files

    Hey Revolt, As far as I know no one has run more than 2 cabs yet. This is a significantly more powerful design in a semi compact size than any others I'm aware of on the market. Especially in the 25-40Hz range. 6 or 8 should be devastating. The only things that are likely to compete or exceed these on a 1 vs 1 basis are Danleys largest most expensive subs like the BC415, TH812, or DBH218LF and other major companies top of the line largest, most expensive subs. M-force based systems, etc...As far as subs go you can accomplish a lot with cabinet design and " magic" ,but at the end of the day you need power handling, cone area and the ability for the drivers to move a lot of air via high xmax. Dual top of the line 21's are used for a reason. The Faital 18's give up displacement capability, cone area and I've not simulated them or tried them in this cab. Out of what Faital offers the 18XL2000 is probably the best match without giving up too much output. I'd really recommend 21's though. The extra cone area helps out a lot. If cost is an issue the Lavoce SAN214.50 models very well. I'm not sure what it would cost in the UK but here it is very reasonably cost ($450 usd). I have 2 on hand for testing and so far it looks like a lot of driver for the money.
  18. Ricci

    Ricci's Skhorn Subwoofer & Files

    Yes...Different ports. I'll post more about it when I get closer to being finalized.
  19. Ricci

    Ricci's Skhorn Subwoofer & Files

    It will be a bit different. Not hugely but it is a different fold and layout. I increased the size a bit since I'm not worried about keeping it as compact as possible like with the dual 21 Skhorn. Same similar design principles to the MAUL and Skhorn but another totally different cab.
  20. Ricci

    Ricci's Skhorn Subwoofer & Files

    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 done by the end of the month.
  21. Makes sense it was something posted by Bennett. Cool. I'm not on FB so thanks for sharing. Those are using more neo than I thought.
  22. I finally got around to groundplane testing these drivers about 4 years after getting them. Results for a pair of them wired in series in the old DO cab are uploaded. K20 still couldn't quite get to the absolute limits. It doesn't like wanging everything it has into 1ohm per channel for some reason. Any discussion of the drivers or test results should go here please.
  23. Paul your picture causes me to have questions. Did you get a tour of B&C factory? Looks like the crate is full of them and they are not magnetized at this point? Is the top plate attached already?
  24. Ricci

    B&C 21sw152 4ohm

    If the price for you is the same get the B&C no question. I wouldn't even think twice.
  25. Ricci

    B&C 21sw152 4ohm

    I don't have a single version of the Skhorn style of sub done. I'm going to work on it again soon but it will probably take me months to get the SW's design and prints done and it may not be what you are looking for anyway. It's not supposed to be a HT sub. I wouldn't wait on it.
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