Jump to content

Leaderboard


Popular Content

Showing content with the highest reputation since 04/20/2019 in all areas

  1. 3 points
    You may have heard...You may not. Eminence is upping their game and coming out with pro woofers that compete directly with the competition. I was able to get some early samples of their 21. So far what I've seen from this woofer is very encouraging. Specs, notes and impedance curve from one of the sample units are posted. Much more info will be coming. https://data-bass.com/#/drivers/5cc9adeb9b899d0004e43084
  2. 3 points
    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. 2 points
    So, on our list is a standalone graph(s) /w compare ability that has a sticky link so you can pass it around. shouldnt be too hard to add that now that we have all the core tooling built and data input into system, but im glad you brought that up.
  4. 2 points
    Tried some white duratex. Kind of cool. Two boxes are done. Driver fits! May put one more coat of duratex on. The white doesn't cover as well.
  5. 2 points
    Lots of screwing this weekend
  6. 1 point
    Notes and measured specs for this driver are published now. It came in a little bit different from the factory specs but some break in should do it some good. Normalized motor force of 448...
  7. 1 point
    http://www.jblpro.com/www/products/tour-sound/vtx-a-series/vtx-b18#.XNwR5LdRU0M Yes , I got my drivers a few weeks ago, they are absolutely stunning. I love the way they perform and the new materials used for them
  8. 1 point
    Not yet...There are a few outfits with 12+ Othorns though. 6 Skhorns should be able to produce the levels and frequencies you are talking about at 50m outside. 8 for a bit of extra headroom. 16 sure would be more fun though.
  9. 1 point
    NX6000 should be a good match for a pair of cabs really.
  10. 1 point
    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 types of situations, but it's a festival or club sub that just happens to be flexible and neutral enough to work in a variety of scenarios. The main differences between the Skram and the Skhorn are as follows. Optimize it more for the cost effective 21's like the 21DS115 and Lavoce SAN214.50 rather than the Ipal drivers like the Skhorn. The Ipal's still work of course, but I relaxed things a bit for the drivers that are a little easier to afford and power. Increased size: Originally I wanted to basically saw the Skhorn in half and slap a top panel on there with modded bracing. It would be a very compact 21" sub, which is great, but the driver would fire directly into an outer panel and even with bracing this is a lot of energy being beamed on axis into a large outside panel. I've never been a fan of high pressure loadings with big drivers that do this. I always want the direct on axis energy from the cone to act on internal panels that are going to keep this energy inside of the cabinet better. This required a rearrangement of the internals. I also added a bit of size while I was at it. I decided to stop at a size that was significantly smaller than the full Skhorn, but not as small as a true half. If this cab is too big or heavy you could always build the true half Skhorn, which would be 24x32x27.71. Increased vent area and slightly increased vented chamber volume. This should help the noise, compression and output near the vent tuning. Increased vent area and length means that the vent pipe resonance is lower in frequency than the Skhorn. I'm, expecting that the response will be less smooth above 150Hz, but that's the tradeoff made for bigger vents. The Skram has 4 vents instead of 3 like on the Skhorn. I decided to add one more for even more tuning options. Tuning with all vents open is basically the same. Being a single driver design, the Skram does not have the dual opposed drivers for mass induced vibration control like in the Skhorn. Other than these changes I would expect that this design behaves and sounds very similar to the Skhorn. I'd expect that the two could be used together without issue. They are more alike than dissimilar. Skram Dimensions: 24"x32"x36" (609.6mm x 812.8mm x 914.4mm) Weight: Cab=115lbs or 52kg projected (Driver will add another 25 to 55lbs (11 to 25kg) depending on the driver. Vent Tuning: All vents open = 29.5Hz / 3 vents open = 25.5Hz / 2 vents open = 20.5Hz / 1 vent open = 14.5Hz Each vent is greater in area than a 6" pipe. All vents open is equivalent in area to 4x 6" ports. All of the usual pro 21's should be a good match. 18Sound 21ID, 21NLW9601 B&C 21DS115, 21SW152, 21Ipal RCF LF21N551 looks decent Lavoce SAN214.50 Eminence NSW6021-6. NOTE about the prints! These are extremely detailed due to being designed in Solidworks and the plans from which my personal cabs would be built. The simplified layout drawing is really all that should be adhered to to build this sub. The bracing and hatch can be simplified to suite your own ideas or the tools available to build the cabs. Just make sure it is solid! Any or all of the hardware can be deleted or substituted or modified to suite your needs. Even outer dimensions can be adjusted within reason. Think of the plans as a chassis guideline that can be modified to taste. You don't have to put all of those holes in your braces or use the handles, a half inch roundover on the cab edges, add a cutout for a plate amp on the hatch, etc... Skram print.pdf
  11. 1 point
    After a couple days of building.. first one is closed and sounds sweet so far (no real testing or measurements done yet but will get to that before the end of the month hopefully The Build was coming together quite nicely but it was still a bit challenging because we're limited toolwise and also woodworking-skill-wise If you just take your time and think through every single step twice (or more hehe) then this shouldn't be too hard to build though.. Here's some pictures of the progress so far, please be nice guys, second time building (and woodworking really..)
  12. 1 point
    Nice sub, lots of BL. Pretty much BL^2/Re over 300 is norm now for these 21's
  13. 1 point
    Driver notes and measured impedance and parameters for this 15" are now uploaded. Sealed cabinet testing is imminent in the next few weeks.
  14. 1 point
    3 years, countless keyboard strokes, a lot of conversion work. But we got the new site up. We will add features to the new site over the coming months and bug fixes/ what not. Most importantly the new site is much more readable, we'll have better photos ongoing and its got better tools for comparing systems to each other. Each system has a compare bar at the top of the page where you can query up another system and see them together. I would really appropriate your feedback if you have any. https://data-bass.com old site remains for a bit longer https://legacy.data-bass.com Thanks!
  15. 1 point
    Thanks, Also I forgot to mention that all drivers now have measured complex inductance specs added that will allow much more accurate modeling when used with software that has the capability to use it, such as Horn-Response. I've done some testing and the complex inductance specs can be used with the factory driver parameters even though they were measured from a driver with slightly different specs. Even if they aren't exact the sims will be much closer using them. Or just use the full set of measured specs posted here.
  16. 1 point
    You mention that the suspension compliance is not likely very linear because the former is so large compared to the spider. Whether or not that's the case, it's interesting to note that compliance linearity is not very important if the driver is mounted in a tiny sealed box. In that case, the stiffness of the air spring dominates and effectively helps linearize the restoring force. I'm not certain, but I think this would be the case for most vented alignments too, at least at or above tune. One "flaw" with Klippel measurements is that it's only testing in free air. The Kms adds to whatever force is provided by the back pressure in the box, so "real world Xmax" with regard to overall compliance is likely higher than Klippel reports, depending on usage. Similar considerations arise with regard to BL. For example in a high Qtc sealed alignment operating at Fs, motor force is quite weak compared to the innate mechanical resonance, isn't very strong which in a high Qtc sealed alignment has much less influence on frequencies at Fs than at frequencies far from Fs. Klippel also fails to account for how distortion products are reproduced by the acoustic characteristics of a system. In a sealed box, BL non-linearity is imparted to the cone motion in form of a distorted motor force, but acoustic output vs. motor force drops dramatically below Fs in the sealed box system, which results in the sudden rise in distortion below Fs in sweeps. For large room / outdoor applications where room gain may be weak, a driver may produce very offensive distortion at frequencies below Fs at Xmax well below the "70% BL threshold". OTOH, the same driver in I.B. or a much larger cabinet may not roll-off nearly as rapidly at its bottom and may have much less distortion for the same Xmax. My point with Klippel is that Xmax derived from arbitrary cut-offs (e.g. 70% BL) can't really be used as a simple "yard stick" to compare drivers to one another. The plotted data of parameter variation vs. excursion is very useful but should be interpreted in the context of the overall system and intended use. I haven't seen the Klippel data for this driver, so I'm only guessing here. But if the testing suggests a low Xmax based on Cms (at 50% or whatever), that may not be all that important for the systems that use this driver.
  17. 1 point
    @Ricci - driver bolting was actually quite easy on this one. My impact driver fit nicely under the brace and the handles aren't in the way of the bolts. I did not try putting the driver in with the handles already attached, but you should be able to do it.
  18. 1 point
    We still have some things to clean-up and improve such as viewing the site on mobile browsers, but we felt like we were close enough to make the switch. A few of the things that have changed or been upgraded. The format of the articles, drivers and system tests has changed. The measurements and images can now be embedded into the article rather than being on separate pages. This gives the reviews a better look and flow. The left hand side has a navigation link to jump to the measurement graphs. We may also be adding a tool to hide the paragraphs in the future. We will be doing a better job of posting pictures and hopefully videos going forward. Up to 4 systems can be compared at once now via the system compare tool which will be at the top left of the page. As seen in Kyle's post above. We have added maximum burst output in addition to the distortion limited bursts. Many of the systems tested have an additional 3 to 10dB more output capability beyond the distortion limits in the deep bass. When using a system your ear doesn't alert you that suddenly a distortion threshold from CEA-2010 type testing is being exceeded causing you to limit the volume or turn it down. That's not how it happens. This chart shows the actual maximum output recorded by the system. The distortion limited burst and maximum output burst tables are sortable and filterable by a number of factors. System type, whether it is active or passive, system size class, manufacturer, etc.. The maximum long term output sweep graph now goes down to 5Hz for all systems. These sweeps actually start at 2Hz but 5Hz was chosen as the lowest frequency that allowed the most powerful subs to get up out of the background noise floor. The less capable systems output will fall off of the graph at the lower limit of 70dB. All articles, driver tests and system tests have been gone through and reworded where needed and all of the text has been cleaned up. There was a lot of text coding errors, misspelling and punctuation errors in the old notes. I was aware of it but since we were totally retooling everything anyway for the new site it wasn't worth the effort. This has now been cleaned up drastically. I'm sure there are more errors in the new site, with the huge amount of typing involved but it will be much easier to fix those as we go. There are a few miscellaneous old driver tests or system tests that I decided to add from the archives. There are at least 7 new drivers that are going to be added in the next 2 weeks. I just have to finish and upload the notes. The Peerless STW-350 was added today. The testing methods and evaluation article explains how the tests are done and a basic idea of how to interpret the measurement types. This was called "Know How" on the old site. I've completely gone through and cleaned up/clarified the article and expanded it. I've also done the same with the Bass Myths article. As Kyle mentioned this has been a tremendous endeavor that we are excited about finally nearing the finish line on. Hopefully I can get back to testing subs this year!
  19. 1 point
    There was some discussion about some subwoofers that were linked to my name, in a different thread. Please feel free to ask or comment, and you can use this thread, no need to start a new one. If you go to my web site, you will see product presentations of the subwoofers I sell, and articles related to those subwoofers and bass in general. All presentations and product info are available in English language, most of the articles as well. What I am going to say now, may seem a little strange: I am not on data-bass to promote my products and services. Actually, I am not that keen to have a discussion about either products or technology, here. There are reasons for that. I want this to be my "free-space", where I can post and talk about things, and not worry about whether what I am saying is good for my own products. But feel free to ask, and I will try to answer. There is a contact-page on the web site, where you can find information on how to get in touch with my company. The company is also on facebook, where you can post public questions, or send private messages if you prefer that. The obscenely large "horn" pictured in that other thread has a story behind it. The driver is a 24", so that thing is quite a bit larger that what it seems like from a quick look at the picture. The origins of this design was that the builder was curious about whether a compact-horn using some 24" drivers he already had, was possible. And it is possible, but even with the chosen tuning it gets very large, and the performance per size-unit is not particularly good. The driver is simply too large. It is a tuning with very large rear chamber and short horn channel, closer to a ported pox with huge port, than a real horn. This design performs a little better than 2x V110 - but those V110 would be half the size of one of these overly huge cabinets. The sound quality, however, should be quite good, as there are no resonances and very smooth response in the intended pass-band, it also has a very low cut-off. He has built several of those now, and it would surprise most of you what they have replaced, how sound quality improved, and I have never seen any complaints or concerns about capacity. Which does not surprise me at all, and I have not even heard them. As for the question - why? They are too large, similar performance can be had in half the size, on paper it may seem like even much smaller than that using regular "mickey-mouse" subwoofers could do the job. So, why on earth choose something like this, even if the price-per-size-unit is extremely good due to cabinet made in construction-chipboard. My take is, that the 'I have a 24"' is the major factor, and combine that with the knowledge that when it comes to bass, the real thing requires something very different from what you find in the typical shop, price is low, and suddenly you find yourself looking at ways to make room for a couple of those small houses inside you listening room.
  20. 1 point
    Have you guys heard about the Sensual Sound Technology, on the upcoming Apocalypse Now 4K UHD Blu-ray release? https://en.soundlightup.com/news/meyer-sound-provides-sensual-sound-technology-for-apocalypse-now-final-cut-at-tribeca-film-festival-premiere.html https://www.blu-ray.com/news/?id=25025
  21. 1 point
    Aquaman: Total bass insanity. I just can't believe how much bass is in this movie. I'm not sure even "The Incredible Hulk" in on this level of madness. And even though the track humps around 20-30 Hz there ULF is everywhere. I might have noticed stuff below 5 Hz even. I didn't get to finish the movie because about 25 minutes before the end, my AVR went into protection mode from what I believe was excess low single digit / DC content on one or more channels. (I've tripped it before like this using test signals but never with actual content.) Our movie watching schedule was tight, so by the time I got all the equipment reset it was too late to finish. I also figured the neighbors were likely getting pissed. Yeesh! What makes the bass on this mix particularly powerful IMO is that it is has a lot of content across a wide band and is hot well up into the 100s Hz where much tactile sensation lives. This is crucial to allow one to "feel" the deep bass and ULF in and on the body. And I was feeling it like crazy, for pretty much the entire movie. Indeed, I think the bass was maybe too much. A lot of content including a lot of the music was just way too heavy-handed for no good reason. It sounds like subharmonic synths were used heavily on the track, for better or worse. Also, I think a lot of issue lies in the pacing of the film itself. I felt like WB was screaming at the top of their lungs that their DC comics were bigger, flashier, CGIier, and louder than Marvel's. Furthermore the other track elements including the dialog were also *really hot* in the bass, and I struggled with intelligibility at times. (I'm not sure hearing the dialog was all that important for this movie anyway. ) I would have liked more mids and treble in everything, which is pretty much the same as saying I would have liked less bass. Hopefully soon I'll have an adjustable "bass level" control I can use that maintains neutrality but pulls things back from insanity, which is fun for demoing but a bit fatiguing for a full 2.5 hour movie. Does this suggest that WB's Atmos / home monitoring stages are weak in the low frequencies? (A common problem with using a variety of room EQ options, in my experience.) Or maybe it's a Hans Zimmer thing. He shows up to the mix stages and screams MOAR BASS!
  22. 1 point
    Same for me. I'd prefer screwing directly into the wood. I change drivers often and do the exact same thing. If the screw holes strip I'll either go to a larger diameter screw if there is room in the driver frame, or simply rotate the driver and make new holes. This is one advantage of ply over MDF. Screwing directly into MDF is risky. BTW good work on the cabs. That's a lot of pocket screws!
  23. 1 point
    finally wrote a user guide for the app -> https://beqdesigner.readthedocs.io/en/latest/
  24. 1 point
    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 skramcutlist12mm.pdf
  25. 1 point
×