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Ricci

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Everything posted by Ricci

  1. I see. Very cool. Have you had a chance to fire them up yet? Any issues with vibration?
  2. You mean the 18DS115? In this cab, or? I'd recommend the 21 for this cab.
  3. Also...To reiterate, most of the parameters are directly linked to, affected by and calculated from others. None of them really exist in a vacuum. To further complicate things these are known as small signal parameters and many of them will shift greatly once the driver is subjected to large signals. Subs in particular operate with what would be considered large signals.
  4. I wouldn't bother with triple thick baffles. Most of the vibration reduction would be from coupling the drivers through the cabinet walls in the opposed arrangement. Double thick baffle is good for counter sinking, but not really needed for strength in most cases.
  5. This is from the MK1 HS-24 so I'm sure the MKIII has had some tweaks made. In the absence of the complex inductance data for the MKIII I'd suggest using these specs. It'll be closer than not modeling semi-inductance as it's pronounced in these Plug these into HR by double clicking on the LE box. It is activated once the label turns green. Measured Complex Inductance Parameters Re' 3.572 Ω Leb 0.951 mH Le 14.868 mH Rss
  6. SME answered well. It's complicated. With almost any driver the performance starts to degrade as it is pushed to higher excursion. This really cannot be answered with a single number like xmax that mfg's try to use. The 21Ipal will go to about 30mm one way if not a bit more if you REALLY hammer on it but it does not sound good by then. It gets cleaner at 20mm one way, and again much cleaner at 10mm one way than 20mm.
  7. Cool!!! How thick is the acrylic? How is it going to be fastened to the wood? I don't see any screws?
  8. As long as the volume of the ported section and horn section stay the same. Also the port area and length must stay the same. The horn length also must stay the same. The Beyma drivers are supposed to be good but they are a bit light on motor force for these cabs.
  9. Here's my random thoughts. Shorting sleeve is mentioned but the 1kHz Le rating is way up there at over 2X the Re. Also the shape of the impedance curves shown indicate a very sharp increase in impedance vs freq above the minimum imp above resonance. Indicates a lot of inductance also. Heavy 5" coil and a huge motor with lots of steel. They have not posted the Zma data for download yet, which would allow it to be analyzed with Bolserst's semi inductance excel program to back out the semi Le specs for modeling. Shipping weight is listed at 115lbs. I suspect these drivers are in the 9
  10. Ricci

    AE Techron

    I did. The old 7560's which I believe were the same as the Crown M600 and a couple of other re-badges. It's been a long time but it was something like 1500w burst into 4 ohm and 1000w for a very long time and would do it at 20Hz. Doesn't seem like much these days. These aren't really amplifiers intended for "music" signals. These are industrial grade equipment for labs, measurements, running motors, MRI's, etc. HEAVY loads. They do audio just fine but are WAY overkill for bumping some music. Kinda like taking a Mack tri-axle dump truck to pick up 100lbs of mulch. I love how they rate the
  11. This would be an interesting design. If you can try to use at least a 6" port for each driver. (180cm2 area). Dual opposing the driver will keep cabinet vibration down from the reciprocating driver mass.
  12. Rev 2 to Rev 10...Lot's of refinement along the way it seems. Good luck!
  13. Agreed. Could be a loose shorting ring even. There's a lot going on in the motor and gap area. Could be the spiders not glued fully also.
  14. Hey...Welcome to the site. The first info needed will be details help anyone give advice going forward. Budget? Planned use? Live sound / HT / Car audio etc... Size? Restrictions, shape, etc. Weight? Is this an issue? Amplification? Will it be an NU1000 or multiple LG 14000's? What frequency range of coverage is desired?
  15. Kipman I'll try to look into the user data limits with Kyle. It may be that you've maxed yours out rather than a hard limit on the size of the pics. The car audio guys have been strapping multiple amps together to drive a single load for years. It's rare in pro audio anymore. Seems to be mostly back in the 80's and 90's. I've always heard that it can get messy if the amps gains aren't matched correctly. No hands on experience with this though.
  16. Yep...The 21 Klippel data is from Eminence. I would've preferred to see it done by RedRock but a lot of the time RR seems to cut the data capture off before a long stroke driver is really pushed. They don't seem to ever go past 15mm so the data may not have been as indicative. The Eminence data certainly looks great. The Xmax based on the Klippel defined limits for subs is almost 19mm based on all 3 criteria. I was surprised by the suspension behavior. I knew the spider choice and arrangement was good but I thought the triple roll surround would start to tighten earlier.
  17. Should be fine. It'll only have a minor effect that would probably require measurements to notice.
  18. You would be looking at just 1dB or so. It won't be a huge amount. Also it would slightly change the tuning and relationship of the back chamber to the front expansion.
  19. Hmmm. They seem to work fine for me. Do you mean the amp test links in the first post?
  20. Here's my wish-list for amplifier power testing. If it were me I'd not test full power sine waves any longer than 5 seconds or maybe 10sec if you really want something a bit longer. There's no point. Even the most dense EDM music has breaks and is not anywhere near 100% duty cycle averaged over 10 seconds. If somebody really needs sustained multi KW power it's probably not for music or HT and it's time to look at an AETechron. Definitely no need for 2 minute full power tests IMHO. Plus as you say that'll get expensive when things go BANG! I'd like to see a few different frequencies
  21. MomoTon, The bracing should be fine. You can't reduce the width of the cabinet really. The 21.5" frame diameter of the drivers plus the wall thickness doesn't leave much to gain there. The depth could be reduced as well as the enclosure height but you will be reducing volume for the ported chamber and the ports. You will have to change the port size/length in order to maintain the same tunings and low bass efficiency will be reduced and vent velocity would go up most likely due to smaller vent area. I look forward to seeing your finished project with the CF. This sounds like a
  22. Yep...Based on previous tests on various clones the burst power is huge and should meet spec but true sustained power is about 4kw give or take which will eventually throttle back even more. There really isn't enough in the AC line to support more sustained power in most cases unless on 240v with large breaker so most of the big "tour" grade amps cap out at about the same sustained power. Even multiple speakers really cannot handle that kind of sustained power anyway. Some of the old "iron" amps would do sustained power for at least a few seconds but the power ratings were lower and again you
  23. Good stuff and thanks. The load bank investment wasn't bad at all. Usually when you see distortion creep up abruptly in electronics something in the chain is at the onset of clipping. Measurements for the Pmillet look quite good. I look forward to your amp tests!
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