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  • Quetz

    őstag

    válasz m3ss #149334 üzenetére

    A passzív radiátorról írt Tom Vodhanel mostanában:
    A pr is tuned by mass(weight). I've seen them DF...I think that goes all the way back to the old velodyne 15-12 and 12-10 series? Or did those have the active DF? The problem with a heavy/mass PR is there's no electrical restoring force. So, over time, you can get into significant offset as the weight causes the cone to pull down. So instead of having say 30mm each way of linear xsus you might end up with 25 wach way, then 20 each way. If the system have been optimized for its very limits in that regard you're going to run into serious longevity problems along with audible distortions as well.

    Two other nice to knows about PRs. The basic rule of thumb is to have 2x the air displacement over the active driver. There's ways around that but you still want a minimum of 40-45% more displacement IME. But even this, like just about everything in design is dependent on other considerations. Second, high mass PRs need to have their force cancelled by a second opposing (identical) PR. Well, I guess "need" is open to debate.

    Szóval én maradnék a zárt vagy bass reflex megoldások mellett.

  • -KP-

    veterán

    válasz m3ss #149334 üzenetére

    The XXLS400 uses some linkwitz riley correction to fool the system into thinking it’s in a larger cabinet, which has the advantage of making the subwoofer drop lower than it should. But the XXLS400 is a sealed enclosure so it drops off slowly @ 12dB Oct from about 30Hz
    The P12-300 has a passive radiator and this assists the main drive unit and has output to 22Hz then drops off at 24dB / Oct

    Ezt a BK facebook oldalán írták.

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