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3ll3d00d

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3ll3d00d last won the day on April 17

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  1. 3ll3d00d

    Inductance modelling

    @deepthoughts I think http://www.diyaudio.com/forums/subwoofers/320189-inductance-cancellation-techniques.html#post5390118 summarises it and https://www.roomeqwizard.com/help/help_en-GB/html/thielesmall.html#top gives the full name of the Thorborg paper
  2. 3ll3d00d

    Inductance modelling

    That was the weight it took to reduce Fs by about 25% which is (as far as I recall) approximately what you are aiming for. I don't believe 10-20รท of mms is a target I have ever seen mentioned either, that seems much lower than I recall being used. (Edit: the "testing loudspeakers" book advises to start with 60% of cone mass which is about 100g, not much less than the actual weight used) I am aware of the assorted issues around applying the delta mass method though, as commented in that thread, the resulting basic params are not wildly out of spec.
  3. 3ll3d00d

    Inductance modelling

    I gave it a go with some DATS measurements for a FaitalPro 12RS1066 but get a giant value for Rss (see https://www.avnirvana.com/threads/imported-impedance-measurements-produces-giant-value-for-rss.2687/ for details). I can't say I was super careful with the z measurements but the calculated data seems reasonable with respect to the published params so not sure what is going on.
  4. 3ll3d00d

    Othorn - HT capable?

    IIRC some people have used https://dbxpro.com/en/products/driverack-venu360 with high sensitivity (horn) based designs without noise issues so that might be one choice. If you intend to use a PC for the DSP then interfaces from the likes of motu, RME, lynx should do the job. re headroom, it depends what you take as the baseline so it's hard to say. Clean output at 20dB peaks above average level is probably a not unreasonable figure. I would be inclined to say that the ability to integrate the subs with the mains will be more important than headroom though obviously you really want both.
  5. 3ll3d00d

    Othorn - HT capable?

    headroom is always good of course but, as far as I can see, you are not talking about challenging listening levels ("occasional bursts to 110dB"). This may be worth bearing in mind as you decide on what to build. re the HPF, I assume you're talking about a passive high pass filter. Of course such filters are expensive and/or impractical so the question is why use a passive filter?
  6. 3ll3d00d

    Woofer for 40-250Hz?

    Lead times only about a week atm apparently
  7. 3ll3d00d

    Woofer for 40-250Hz?

    not a bad idea, needs a bigger box though really
  8. 3ll3d00d

    Inductance modelling

    you can import the measurement into REW and let it calculate them for you. This is probably a nice thing to add to all the driver measurements from data-bass.
  9. 3ll3d00d

    Inductance modelling

    I see he's released a build with this feature in -> http://www.diyaudio.com/forums/subwoofers/119854-hornresp-post5404994.html
  10. 3ll3d00d

    Woofer for 40-250Hz?

    actually it's probably more like 16mm or so clearance so a bit tighter than I thought, I guess I'll just have to buy one and give it a try to see what happens I did start looking into 12" woofers (in order to find a shallower one) though anyway the B&C 12NW76 (http://www.bcspeakers.com/en/products/lf-driver/12-0/8/12nw76) seemed somewhat on paper (shorting ring, seems like similar motor strength) albeit models with much more midrange(which I won't be using). I'm never quite sure whether to use xvar or xmax from the b&c specs though. the BMS 12N804 (http://www.bmsspeakers.com/index.php?id=12n804_overview) was another one that looked promising a comparison from hornresp models with EQ applied to use up the 200W on offer while keeping within xmax (vs the 15n840) https://imgur.com/C3qXkV1 anyone with any views on any of these? (or any of the other 12" drivers for that matter)
  11. 3ll3d00d

    Woofer for 40-250Hz?

    I've put together the cabinet for this (pretty simple sealed box) and run into a possible issue due to my depth constraint, if I stick to that constraint then I'm only going to have a shade under an inch (~23mm) clearance behind the pole vent. I estimate the diameter of that vent is ~60mm. I will not be running this really hard, well under rated power, so I have a feeling I can get away with this with no real negative impact (even if it's not ideal). Any views?
  12. 3ll3d00d

    Inductance modelling

    Interesting thread developing on diya - http://www.diyaudio.com/forums/subwoofers/320189-inductance-cancellation-techniques.html - regarding more accurately modelling the effect of inductance (and building that into hornresp making use of data that is captured by rew or arta).
  13. 3ll3d00d

    New additions for db site (need feedback)

    it sounds like the same feature but with different access controls unless I'm missing something so I'd vote for both, if forced to choose then I would go with the "official" custom systems
  14. See http://www.hometheatershack.com/forums/rew-forum/61149-group-delay-graph-how-add-lines.html
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