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lilmike

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Everything posted by lilmike

  1. lilmike

    Samps DS21 Build

    Admittedly, I oversimplified the statement regarding equal peak height above. The relationship between the driver parameters and the box tune dictate the relative size of the two peaks. What matters most is that the peaks you're measuring are a decent match to what your simulation software is predicting. As far as the grille spacing? Yeah, make sure things won't hit. X-mech plus a few mm is a great start, I'd look at the thickness of nominal pieces of plywood or other scrap stock. Make sure the grille does not rattle. Foam weatherstrip and lots of screws.
  2. lilmike

    Samps DS21 Build

    Yeah, that lower peak is a bit "soft", that generally means losses or leaks (or, as I learned, a really useless port). With a typical reflex box, we want the peaks to be about the same height.
  3. lilmike

    Samps DS21 Build

    Possibly. Looks like it is something where you could try it and see. Heck, just cut a piece and set it in place for testing. Won't be 100%, but will give you an idea.
  4. We're not prudes. You can say asshole here. Fuck too, as far as I know. We'll see if I get banned for that... Things here are NOT like AVS. I'm not a mod, but I do know a couple of them. Long and short - show up, participate and give a shit about what we discuss, and don't be a dick about it and there won't be any issues. Nothing wrong with calling a duck a duck. Nothing wrong with having an opinion. Just don't expect to find a bunch of sheep here. I can't (and won't) speak for the others, but I really don't give a shit about what the Internet thinks of what I am doing. I do what I do because I think it might be cool. If it is, I share it, if not, I tell people not to go down that road...
  5. lilmike

    Samps DS21 Build

    PM me. I can help you work through it. They're pretty basic. Might be as simple as L and R channels swapped.
  6. lilmike

    Samps DS21 Build

    Three years.... Weak.... I am still rocking the OG MicroWrecker (since 2013)... No finish, not even sanded, still has big PL boogers on it.
  7. lilmike

    Inductance modelling

    I was hoping that the WT2 devs would be able to incorporate Thorborg's approach into their calculated T/S parameters so I could get semi-inductance parameters for HornResp, so I asked them to consider it. Keith got back to me and said that the calculation of the parameters is trivial, the complicated part is incorporating the changed approach into the rest of their simulator. If they can, great. If not, I am not too fussed, as I also have ARTA and could always use REW. Now, I just need some time to actually build and measure speakers...
  8. lilmike

    Inductance modelling

    I did hear back from the WT2 devs. They're researching Thorborg's approach and evaluating adding that capability to the software. If I do a custom impedance sweep with the WT2, I can export the data as text. That's pretty much the same thing as I'd do with ARTA or REW though, so why not just use those tools?
  9. lilmike

    Othorn - HT capable?

    To be 100% clear, I absolutely recommend highpassing horns due to their out-of-band distortion performance.
  10. lilmike

    Othorn - HT capable?

    @SME Thanks, you're too kind... Only thing I might discuss is this claim: "Keep in mind that unlike FLHs like the F20, a TH *requires* a high pass filter to protect it from unloading and avoid heavy distortion and/or permanent damage." This is not always true, and it is all based on the characteristics of the driver used. If you have a driver with a sufficiently stiff suspension and a motor where there's an abrupt drop-off of BL with excursion as the coil leaves the gap, and you have a driver designed with ample mechanical clearances, you have a case where the driver can't be bottomed in free-air, regardless of the power applied. If it can't be bottomed in free air, it likely won't bottom in a tapped horn, regardless of what the simulations say. Large-signal models based on small-signal parameters that don't scale linearly are often not 100% valid in predicting the actual results. Only way to discover cases like these is to build and test things to the driver's limits. I've not had nearly enough time or folding money to do much of that lately.
  11. lilmike

    Inductance modelling

    Yeah, I suppose I could do it that way, if I had saved the sweeps. The WT2 doesn't save the individual sweeps like that. In my case, I could also just use ARTA or REW and measure things directly.
  12. lilmike

    Inductance modelling

    Thanks for the heads-up. Sadly, it looks like the WT2 data does not have the complex inductance parameters in a format Hornresp can use. I've sent them an email to see what (if anything) can be done.
  13. lilmike

    Othorn - HT capable?

    Yes, that was the original build. Completely unbraced, but I did use decent 3/4" plywood. In hindsight, it would have benefited from some bracing. One thing to note - when turning up tapped horns, it has been my experience that the response flattens out as they approach war volume. Of course, war volume SPLs in an apartment might make for war with the neighbors.
  14. That's the same way I did mine, as well as the CEA2010 limits.
  15. lilmike

    Inductance modelling

    Following along with that too. I'm very interested in modeling inductance effects properly. I have a hard time changing things we can measure accurately to account for the stuff we're not looking at correctly, so I look forward to what comes of this. I'll hopefully be building and measuring a few things soon.
  16. lilmike

    Faital 15PR400, BMS 4594 MTM

    Well, that sucks. Still, for what they cost and what they do, 6 years isn't too bad, mine's actually coming up on that point too. I'll be sad when it dies, but I've gotten my mileage out of it.
  17. lilmike

    Rockford Fosgate T3 19 discussion

    Ummmm, yeah, actually I'm pretty sure I do have some power on tap. Nowhere near that level though. DAYUM man, that's more wattage there than some tours run....
  18. Sweet, this will be perfect. I can enjoy the movie without a sub and know that I am not missing a damn thing. (No subs yet because I am still trying to scrape the cash together to buy my drivers...)
  19. lilmike

    Replacement AVR / processor

    Right on! Hope it works well for you. Snakes like that are the only way to go. I'm looking at buying a long snake, then cutting it up and making custom ones for my rack, things will be so much cleaner. I am doing speaker "snakes" like that too, running L and R in a 4-wire cable from the amps to a Neutrik 4-pole in the wall. Once I used a consistent wiring pattern, that has worked well.
  20. lilmike

    Moving massive / unwieldy subs?

    Those lifting straps? I've tried them, they're OK for some things like couches and beds, but not something I would use on a sub. I have a little bit of experience moving big subs. We used an appliance dolly when we had to get the pair of LilWreckers down a flight of stairs and into a basement theater. Definitely took two of us, and I'm not a small guy. LilWreckers are ~32 cubic feet and about 300 lb if I recall. Google appliance dolly images You should be able to rent or borrow an appliance dolly without too much trouble. I moved the F-20, MicroWrecker, and a number of other unnamed tapped horns with my 2-wheel dolly, but I didn't have to climb too many stairs. No matter what, using some straps to secure the sub to the dolly is a fundamental. A second person can be a huge help too. Of course, if you have another stout person handy (looking at you, @Ukko Kari) , you just pick the cabinets up and carry them, like we did with the AlpineGeists.
  21. lilmike

    Faital 15PR400, BMS 4594 MTM

    Yeah, the Woofer Tester 2 is pretty nice. I am pleased with mine, I have used it for years. I shared my version of the REW impedance jig that the OP's gear is based on for cases like this where that sort of an investment may not be warranted. It might not be perfectly exact, but it is a measurement of the impedance of the drivers in the cabinet, which has a LOT of value, even with the crosstalk issue. It's pretty clear that the tune is closer to 30 than to 40, which was his target. Odds are, when he takes the tune up closer to 40, the crosstalk will be less severe and the results might look a little better. I have no direct experience with the specific gear he is using, I do have its little brother though (Xenyx 302USB). It's not used in my measurement rig due to the crosstalk. EDIT - my bad - OP is using a UCA202 for the USB input and source. Those definitely have the crosstalk issue we're seeing here. I have plenty of those and know the crosstalk issue very well.
  22. lilmike

    Faital 15PR400, BMS 4594 MTM

    Looks like the sound card has the dreaded Behringer crosstalk issue. There's a strong rising response below 20 Hz. That may mess with phase.
  23. lilmike

    Real life sounds - instantaneous loudness

    "Keep the original on disc... and then let us choose to squash it." But, louder is better... It just blows me away that we use such a small fraction of the dynamic range capability of the recording medium. A CD is close to 100 dB, yet the best recordings are barely 30 dB. A Blu-Ray is theoretically capable of 144 dB, yet we see about 35 dB used in most cases. According to Wikipedia, human hearing has a 140 dB dynamic range.
  24. lilmike

    inuke 6000dsp mod for less rolloff

    At least they aren't blue. Blue LEDs need to die in a fire.
  25. lilmike

    inuke 6000dsp mod for less rolloff

    I measured mine (a 3K DSP) when I got it. It was a little better than that, my quick low-level sweep indicates the amp is -3 dB at 5 Hz, which is approaching the limit of the remainder of my gear, including my measurement rig. Fan modding was required, but I haven't messed with the filtering. Heck, I'd repaint it and lose the orange halo rings before I messed with the internal filters.
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