Jump to content

All Activity

This stream auto-updates     

  1. Yesterday
  2. SME

    Ricci's Skhorn Subwoofer & Files

    In practice, how much does CMS actually vary in different manufacturing samples (assuming the same batch of parts)? I know we see lots of variation when we attempt to do measurements, but that's not necessarily the same thing. The value obtained may depend a lot on the details of the measurement, and the value is known to be quite sensitive to temperature and humidity. Both of these kinds of things should be expected to affect both drivers equally.
  3. Ricci

    Ricci's Skhorn Subwoofer & Files

    Hey Paul...yes I modeled that out of curiosity after the MAUL debacle with series "loaded" drivers. Yes if you change the driver specs some differences arise but what you have shown isnt too bad. Dont forget about how quickly suspension bits start to tighten on these pro drivers after 10 to 15mm. Not to mention the BL loss. The driver excursion should even out at the limits. Its fine for me. YMMV
  4. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    This is the excursion of two 21Ipal in series in the same enclosure, with the CMS having a difference of only 10% between them. The place where I did these tests is a parking lot from an old factory where we have the workshop. It is surrounded only by other workshops and some offices that were closed at that moment. The parking lot is big, around 50 by 60 meters and if I go as close to the middle as I can, the frequency resolution is very good and I can get good accuracy down to 20 Hz.
  5. Last week
  6. SME

    Ricci's Skhorn Subwoofer & Files

    I don't see how a pair of drivers in series could cause a problem. Three or more drivers, yes, but only two? Anyway, I installed a 3/4" wall between chambers in my D.O. sealed sub because I was paranoid about local acoustic loading effects and wanted to option to possibly run separate signals to each end at some point in the future. That pic looks great! I'm sure your neighbors love you.
  7. SME

    The Bass EQ for Movies Thread

    Do you know how similar the two tracks really are? I tested this out on the DTS track (no UHD here yet), and I'm seeing (post EQ) levels that are hotter than I'd expect, even for BEQ. One of the effects (SPOILER: select text to reveal <<< the destruction of Leia's ship >>>) clips not just the amps but my digital processor, which is pretty extreme. Note that my digital domain headroom is not based on 7.1 WCS but rather is a few dB higher than that required to drive the amp to max voltage. The PvA doesn't look *that* crazy. Are these just examples of extremely ULF-heavy broadband effects? Overall, the effects also seem a bit bottom heavy, and some of the ambiance and tension ULF seems rather overkill. Since I don't really how the tracks compare and can't measure them right now, I'm thinking of proportionally scaling back the correction until I have enough headroom and/or the bottom sounds a bit more balanced again. Perhaps it's another case, as with "Thor: Ragnorok", in which the two tracks are have substantially different bass profiles? Edit: I dialed back the BEQ to 75% (in terms of dB) and also made some minor broad shape adjustments (> 100 Hz), and the mid-bass slam is back and proper. I presume the latter changes were more important, but this BEQ was just too much for my system. Even at 75%, the aforementioned scene as well as (SPOILER: select text to reveal <<< Phasma falling into the flames >>> still clip in the amps at my chosen playback level. There's still plenty of infra power all over the place. Very nice! The overall level on the track is lower than typical, and I find it to be completely comfortable at MV "0" (equivalent to "-2" after dialnorm). The mixer must have liked less loudness or else his monitors sounded overly loud to him. Either way, the soundtrack quality is superb, easily better than TFA. Edit2: I watched this all the way through with the DTS 7.1 track at MV "0" (-2 with dialnorm) with guests and 75% of the correction applied. There was tremendous infra, but it honestly seemed a bit repetitive with almost every effect being very bottom heavy. The bigger on-screen events were rather disappointing because the effects were the same or weaker than for many other lesser events. Since I still don't know how close the PvA on the DTS track is to the Atmos track, I have no idea if my track was corrected as intended. Maybe the DTS track is ramped more aggressively or rolls off less in the ULF. The most impressive effect was the latter of the two scenes mentioned above that clips my amp, which unfortunately seemed only vaguely connected to anything obviously big on-screen. I don't know what frequency the effect focused on (mid teens?), but it was downright violent. I felt like my body was being tossed around like a jet flying through turbulence or something.
  8. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    @Ricci Thank you for the reply. I am a bit concerned about that behavior, it is not related to the loading in the horn,but the behavior of two reactive loads linked in series, that see different voltages based on the difference in impedance and electrical phase. Anyway, the subs are extremely potent, the content below 40 is so present and clean! I wouldn't be afraid to put them next to Funktion One F132. Unfortunately the clone power supply was not up for the task and after less than an hour with a sub on each channel, it died. Then I tested them with 2 Crown 5002VZ in parallel mode, each sub on a channel and the deepest bass was achieved , it could sustain 85 volts in impedance minimums without any sign of backing up, but the punch and headroom was smaller than with the clone. The next step is to completely change the bracings, build another pair, load them up with 21ID and IPal modules, buy a K20 and then compare them 2 vs 2 and see what happens, whichever is best. I bet on the K20+ 21Ipal combination but one could never be sure until I get the tests results. I would love to use these with SpeakerPower modules, each driver on its own amp, with 4-6 kw, because IMO , that's when the party is really starting. Unfortunately it's hard to buy them from the states.
  9. I recall "Ex Machina" had a loud droning score toward the end and the DTS:X mix sent the score almost entirely to my surrounds. I turned things down a bit because I was worried about long term power effects.
  10. The first time I saw BL2049 was at low volume late at night with the crowsons providing all the deep bass, and still that score was reach-for-the-volume-control-lest-you-wake-people loud. Something tells me if Philip K Dick was alive he would probably approve. JSS
  11. Ricci

    Ricci's Skhorn Subwoofer & Files

    I did not with the 21Ipal's. It performed as expected. Tested it to the limits of the amps with a SP-6000 and also a K20 bridged. In all 3 tunings to boot. No issues at all in any use or test I've thrown at it. There are a few other guys with these now as well and they've not reported anything either. If it bothers you a simple addition for peace of mind for the Skhorn layout is to simply add a 1/2" solid panel from the front panel to the back. It would literally be two completely isolated cabs in 1 box if that is done. You would have some slight changes in the upper end response due to changing the "special sauce" a bit though. Nothing to worry about there.
  12. Ricci

    Ricci's Skhorn Subwoofer & Files

    4 ohm are a little better according to modeling due to slightly higher motor strength / lower Qts. Both should work though.
  13. I finally got around to watching my Blu-Ray of Blade Runner 2049. Like in the theater, lots of bass. Most of it hovered above 30Hz but it was definitely weighty and sounded pretty good. But I did run across an acronym that is really appropriate for this movie (plus Interstellar and TDKR): ZIHL, or 'Zimmer Induced Hearing Loss'. Good lord was the music fucking loud. And not for short amounts of time either. One sustained synth tone had to be red lining in multiple channels and it went on, continuously, for over ten seconds. There was no modulation, no variation, just "BWAAAAAAAAAAHHHHHHH" Something's wrong with your mixing when I have to lower my volume for that but can keep it constant through gunshots, spinner crashes and explosions.
  14. I have not posted here in a while. So this is where all the old guys all hang. Old as in long time posters. Scott, good to see you still around.
  15. maxmercy

    The Bass EQ for Movies Thread

    I will look at it soon. JSS
  16. WereWolf84

    The Bass EQ for Movies Thread

    can the lousy Pacific Rim Uprising being BEQ?
  17. lilmike

    The Bass EQ for Movies Thread

    for reference... https://youtu.be/hcOwz99GS4c I'm right there with ya. Definitely have experienced the "fizz" with cars, even some proper subwoofers...
  18. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    @Ricci Did you have any problems linking the drivers in series on a single amp? From what I get in sims and in free air tests, the excursion goes mad if the parameters are just a bit different on the 2 drivers. Also the loading can change the behavior
  19. Pradeep

    The Bass EQ for Movies Thread

    The dcx2496 has some limitations. Three inputs being one. Can the Motu 24Ai be used to feed in analog 11.1 from a receiver and then output 11.1 back out after eq? Or do I need the Motu 24Ao unit for the analog output channels? Will be monitored/controlled via PC and prob jriver for the eq but would like to still be able to throw a 4k disk in the player and watch. Edit to add: ok so the 16A can do 16 in and 16 out and is $1500, otherwise 24 in and 24 out with the 24Ao and 24 Ai for $2000.
  20. Earlier
  21. Sure. I mean, it's mostly a ~30hz extended movie with 1.5secs of massive ULF. But yeah, I guess it is unfiltered.
  22. Infrasonic

    Samps DS21 Build

    Lookin' good! Nice response too. That would even be a nice response post EQ.
  23. Samps

    Samps DS21 Build

    Forgot to update this thread. Sub has been up and running for a while. Turned out exactly how I wanted it to. Subjectively I'd say it sounds better than my previous diy subs at the same spl. It can dig low enough but still has that impact that seems to be missing with some of the high excursion drivers. Good all around performer. Currently it is firing directly into a corner. I spun it around to get a pic. Sweep is at mlp with no eq other than the hpf bw12 @20hz. 6th smoothing. Pretty good response to start with before any eq. Thanks for all the help guys! Learning to take impedance tests has and will change all of my current and future builds.
  24. SME

    Raw data for just 1 system

    $ du -hcs acoustic-measurements 8.8G acoustic-measurements Bummer. No bragging rights for me. That also includes a lot of simulation output.
  25. thebuckaman

    Ricci's Skhorn Subwoofer & Files

    Quick question, can both the 4 or 8 ohm versions of the B&C 21sw152 and 21DS115 be used in the SKHORN? Any difference in performance between the 4 and 8 ohm versions? Thank you in advance.
  26. lilmike

    Raw data for just 1 system

    Oh hell, that's like 10X me... I thought I had issues. Fired up ARTA for some TSPs over the weekend. Man, has it ever been a while. Took me a whole afternoon to remember how to set it up. I like it, but DAMN is it ever sensitive to calibration. Used the Saffire and the Behringer 0204HD, I like the 0204HD a bit better if I'm being honest.
  27. Ricci

    Raw data for just 1 system

    Im wanting to say I have approaching 40gb of "speaker" related files and measurements. Its been a while sonce I checked.
  1. Load more activity
×