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Everything posted by Ricci

  1. Crispy coils are what's for dinner! Sorry to hear about that Tahoe. PL380 is a serious amp. How many Skrams do you have? All 21SW152 loaded?
  2. Careful using slow sine waves for this type of testing. It's a good way to cook a voice coil.
  3. I've been busy with other things and haven't done much related to bass or subs in a long time. I still have the 2269H and some other drivers that I need to GP test in the sealed cabs at some point. I may get back to it next spring. Maybe not.
  4. I don't use a HPF with sealed subs either in testing or my systems. I'm careful during testing to not push the level too high and in my systems I try not to have enough amp on tap to bottom the drivers with the box size used.
  5. I'd echo SME here. The Othorn is still a very good sounding design but I'd consider the Skram instead. It's smaller, lighter, has flexible tuning options and is simpler to build. Output and SQ should be the same if not a bit better due to the more extended top end. Issues don't start till higher in frequency that the Othorn.
  6. You could do something similar and shrink the cabinet and slot volume somewhat to better fit the 18". The 18 doesn't need as much airspace to work in.
  7. I'm not entirely sure what it would be for the SI 24's. The cone holds a lot of volume but the surround is huge and protrudes a lot unlike the pro drivers. Also the frame is really thick on these and it'll be front mounted which moves the whole assembly forward quite a bit. It may actually be less than a back mounted 21" pro. This is probably a good generic guess. AVH...300-350cm2 for each driver should be added to S2. This is used rather than Atc/Vtc. It has a better track record, in my offset designs at least. Also the AE drivers have extremely low inductance. I doubt the complex
  8. Are your FR measurements above after EQ? If so do you have any from before EQ? The waterfall indicates the decay rate of the sub in your room. It looks like you have a bit of a resonance at 27Hz, 42Hz. Not bad though most rooms do. Seems like you might have a bit of ground hum at 60Hz...
  9. Hello Enrique... What is your budget for the subwoofer? What would be a maximum size you would like for the sub? LxWxH?
  10. I see. Very cool. Have you had a chance to fire them up yet? Any issues with vibration?
  11. You mean the 18DS115? In this cab, or? I'd recommend the 21 for this cab.
  12. 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.
  13. 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.
  14. 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
  15. 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.
  16. Cool!!! How thick is the acrylic? How is it going to be fastened to the wood? I don't see any screws?
  17. 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.
  18. 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
  19. 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
  20. 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.
  21. Rev 2 to Rev 10...Lot's of refinement along the way it seems. Good luck!
  22. 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.
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