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Ricci

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Everything posted by Ricci

  1. Ricci

    Ricci's Gjallarhorn & Othorn Files

    It was never billed out in man hours to me for any of the cabs I've had built. We just negotiated a labor price on top of the raw materials costs up front. I never searched for someone to build any of my cabs either. It just kind of happened that I know some fellow DIYers who were willing to work on them for reasonable prices. I had the Othorns, Gjallarhorns built by one guy. The MAUL's by someone else and the Skhorn's most lately by member DSL1. I covered materials+ shipping+enough extra to cover some labor each time, but I probably got quite the hookup on some of the labor charges. In fact I know that I did. Just the wood, duratex, glue, wire, screws, handles and shipping on a pair of any of these is substantial. The labor hours are also substantial. You can save a LOT of money by doing it yourself but be prepared to put the hours in. If you would rather have a pro or someone with a full on cabinet shop and all the tools build them, it will cost. If you need to discuss in more detail we should take it to PM.
  2. Ricci

    Upcoming Testing Possibilities?

    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.
  3. Ricci

    X-curve compensation re-EQ

    Cinemas often sound very midrange forward and rolled off up top to me which is what would be expected. Some of them also sound very loud and harsh to me mostly in the upper midrange I'd guess as 1-4kHz. Just an observation. Do we know that the mixes are usually created on large cinema type systems employing an X-curve? Thus baking in boosted HF and LF content. The X-curve shape vs air absorption of HF might be worth pondering. I admittedly have not done much research on the X-curve in quite some time. Is the P/N calibration usually made at a few spots centered in the theater seating or many averaged positions, or in worst case at only a single position? The back wall seats of a large cinema could be >100ft from the speakers and a "good" center seat in the theater would probably be around 40-50ft for a typical commercial cinema. Those are significant distances which reduce the HF energy. Below 1000Hz there would be little effect, assuming typical indoor atmospheric conditions and a distance of 40-100ft , but at 5kHz and above it becomes a major factor. There could be a loss of 5dB near 15kHz quite easily. I'm assuming the mixing desk in a full size cinema screening room would also be a good 30-50ft back from the speakers. This may take care of the lions share of the top end response of the x-curve, depending on the room and where it is measured. I wouldn't say I avoid using EQ on my subs at home, it's just that my response is what I would consider to be pretty good below 100Hz natively, both the main LP measurement and averaged across many seats. Relative to the raw measurements I've seen from most. A combo of luck and a bit of thoughtful planning + research through measurements. It's been a while since I looked at it but I think it was something like +/-6dB from 8-105Hz with no Eq and no smoothing. There aren't any big nulls over that range and only one high Q peak at about 45Hz (center room seating) and a bit of a shelf up near 70-100Hz. I was able to get it to +/2dB with 4 simple filters. The major issue I tried to address was the 45Hz peak. I had it EQ'd flatfor a while, but something always seemed off with kick drums and other sharp bass events centered near 40-50Hz. It took a lot of cut to get it back to flat and that range just seemed to lose any sense of power or clarity at the main seats and was MIA anywhere else in the room. That peak primarily comes from the right 2 subs from what I recall. I spent sometime messing with different amounts of cut to that area but it just never sounded right. I think that cutting it so much had other noticeable effects besides reducing the direct sound energy at a relatively small area in the room as measured by the mic capsule. Are you saying that minor bass shelf adjustments of only 0.5dB wildly affect your perception of the bass sound quality on your system? Your ears must be better than mine my friend. I don't think I would notice unless someone told me it was done and then only very subtly if at all.
  4. Ricci

    18" SW115 4ohm - $425 + shipping

    Never even hooked up eh? I was hoping you'd be able to compare it to the 5100 and give me your thoughts. Dang it.
  5. Ricci

    X-curve compensation re-EQ

    Good discussion so far. I'd say that the issue stems from the fact that there is some kind of standard developed for large cinemas, so most of the mixing effort is skewed in that direction. There really is no standard for "home" listening rooms, or even studio mastering rooms. Sure we can come up with some rigid standard of what it should be, but the reality is that it will be all over the place. Once it goes to the consumer for playback all bets are off. You might have someone with a badly setup HTIB 5.1 system, another with playback through a soundbar and a third with a 1% system such as many members here or at AVS. A commercial cinema on the other hand, while it may be quite different from the one across town, will be close to other cinemas in the areas of: Acoustics, room design, shape, gear and playback capabilities comparatively. How much of the optimization for cinema playback is directly put in the mix, versus compensated for at the playback gear / speaker EQ level, is what I really wonder about. It would be best to use the playback gear to handle that for each room, but if the mixes are truly done in a big cinema room to begin with undoubtedly some of that will get baked in. EQ is a powerful tool but in my experience once things have been EQ'd multiple times at each step in the process it can begin to muddy the waters and cause a loss of cohesiveness of the mix. It has to be used with care, especially with narrowband filters. That's just my experience. After doing some A/Bing with and without EQ at home I don't use any EQ on my subs other than the low pass filter. With EQ was flatter at the main 2 listening seats but didn't sound better to me. I think it may have something to do with the total bass energy output into the room vs measured at a few pinpoint specific points in the space.
  6. Ricci

    New CEA 2010 in room Measurements.

    I have been doing most of the commercial subs in my room as well for quite a while. Mostly as a data point on the room acoustics effects I have and how distortion is lowered in the deep bass. Mic is at head position at the main seat and subs are placed in the same corner each time. Only valid for my room and that exact placement.
  7. Ricci

    (8) Ported Incriminator Audio Judge 21" build

    Finally! I bet you will be glad to have this project off of your plate and be able to fire up all 8.
  8. Ricci

    Othorn Plans

    It should be fine. Response shape may be a hair different but not a deal killer by any means
  9. That is good to hear Nick. I decided not to see that in the theater so I could fist watch it at home. Looks like it has some good 12 to 25Hz energy. My buddy also said the visuals are stunning.
  10. Ricci

    New SVS Ultra 16"

    Looks like it is time to try that K20 out on the next big woofer across the bench. Judging by the slope of those curves it looks like the 70% BL point is going to be around 20mm.
  11. Ricci

    The Bass EQ for Movies Thread

    John how much time does it take you to go through the process above?
  12. Ricci

    New SVS Ultra 16"

    I went back and looked at the Tymphany STW-350F specs and they are totally different from the specs that ITR posted from a PB16 driver. Originally I thought that these drivers would be quite similar or were at least using a similar build platform. After looking again there is very little similar between them at all. The frames are different, the STW-350 is 15" OD but the SVS appears to be 16" OD. The STW-350 is using an overhung topology with a 7.4" diameter coil. SVS says they are using an underhung 8" nominal diameter. That being the case both the surrounds and spiders would be different. The overall motor / gap / coil geometry would be much different as well. In fact it seems like perhaps the only parts shared would maybe be the motor case and backplate. Although the motor outwardly makes the drivers seem like close brothers it appears that they are more like estranged 3rd cousins. Modeling the 2 drivers using the parameters provided shows that they behave as differently as you would expect. The SB16 driver should be a completely different 3rd driver design. I must say this has gotten me interested in testing the SVS 16's again.
  13. Ricci

    New SVS Ultra 16"

    Thanks. They are not what I expected. I just checked and this would've tied the 21Ipal as having the stiffest suspension I've ever encountered.
  14. Ricci

    New SVS Ultra 16"

    Welcome to the forum... Just to clarify...These specs are pulled from what driver? What jumps out at me is Qts = 0.87 BL^2/Re = 118 n0 0.186% Cms=0.039 Extremely tight suspension + 500g mms and a relatively low strength coil / motor system results in a very inefficient driver. Very odd set of design tradeoffs IMHO.
  15. Discussion of JTR's mammoth main speaker should go here.
  16. Ricci

    JTR Noesis 215RT Measurements Discussion

    Kinda off topic from the 215RT... In general if I was selling subs or speakers I'd probably aim for a flattish response to 30-35Hz and a gentle 6 to 12dB/oct roll off below there. Rooms vary a LOT but if you look at the broad trends vs individual samples most rooms seem to have some moderate boost by 20-25Hz and a large amount by 10Hz. Mine has about 3.5dB at 20Hz and about 14dB by 10Hz. There are always those examples that don't and you have your usual room issues such as the dip in the 12-17Hz range that occurs in a lot of rooms, or the peak near 40-60Hz for seating placed near the center of the room. A lot of companies go for the flat full or half space bass response. It's really a matter of preference and design choices.
  17. FV25HP measurements are viewable now.
  18. Test data and notes for the F18 18" sealed sub and its brother the FV18 vented sub are both viewable on the main site now. Please place any discussion or comments here. Thanks,
  19. FV18 results posted...
  20. Do you have Alpine? How much is a SWS-15d2 or an SWR-1522D? $400 is a lot for a UM18.
  21. How much is an Ultimax in Belgium? How much is a 21" B&C? I'm just curious. There may be other driver options that make more sense given his location.
  22. Ricci

    Maximum horn compression ratio?

    Yes we are in agreement. We dove a bit deeper than expected. Again. But it happens. Yep extra mass or lowering of Fs shofts the max efficiency point down in freq. What were we supposed to be discussing? Horn compression in the throat? Ha.
  23. Ricci

    Maximum horn compression ratio?

    SME, Yes mass and suspension compliance affect Qts. Higher mass and stiffer suspension both squelch efficiency. No need to worry about those if strictly comparing the motor and coil systems with BL^2/Re, but in many cases what people compare is off the shelf drivers. There the Mms and compliance matter and those are factored into the final Qts value. Resultant Fs also shifts the efficiency maximum. As will the final enclosure design, etc. We really can't just look at Qts though due to complex inductance effects on these types of drivers.
  24. Ricci

    Maximum horn compression ratio?

    Dave, BL rating means nothing alone. That does not tell you the effective efficiency or "strength" of the motor /coil system. Resistance also has to be considered at minimum. BL^2/Re Or just look at Qts Technically the normalized inductance should also be considered as it effectively saps the efficiency and raises Qts. You need to include 3 parameters at minimum. BL, Dcr and Le. Or like I said just use the easy button and compare Qts, though that doesn't consider Le effects.
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