I'm in agreement. Sealed boxes may be less efficient but there is far better control of the driver due to the box being sealed. Instead of a 24Db octave (or greater) rolloff below the box tuning frequency that goes out the window, instead you get 12Db/octave & far less group delay :TI dont doubt you guys, I just prefer the sealed sound, and I get just the low end thump I desire an expect, and more so than I did with the ultra I had.
As long as we're all happy, thats the main thing :T
Not really no. To get a critically damped system Qtc needs to be around 0.5, anything above this will result in a slight "overhang" on any low bass note being produced. Just EQing won't get rid of that but you can get rid of it via some electronics. What you'd need is a Linkwitz Riley filter network, this can actually not only equalize the enclosure to a much lower frequency, but also get rid of that overhang in the driver response.Dan,
Agreed matey. Thats the important thing defo. The one thing I was going to say was even though my sealed sub had a high qtc, once EQd doesn't that pretty much go out of the window.
When i say overhang what i mean is the driver doesn't instantaneously respond to the signal applied & does stop as soon as the signal ceases. With some subtle electronics it can be made to do so :clap:
Qts of a driver is determined mostly by the strength of the magnetic field surrounding the voice coil. Low Qts drivers have a much better control over driver motion simply because the amplifier can act as an electronic brake or accelerator. With a high Qts or Qb the amp has less control & the driver can do what it likes in certain respects.
I always think about it in a way like cars. British cars tend to (sorry no offence meant at all) have good damping & do what they are told so react pretty well to changes (just like we'd like our speakers to do ). American cars on the other hand appear to wobble for a good 5 seconds when they stop, something like a waterbed & this is the same kind of effect that an underdamped (high Qts or Qb) driver will display (though not as badly - it's just to give you the idea). To some extent reflex enclosures whether they are low of high Qts drivers will exhibit the same effects. Better by far to use a driver in any reflex enclosure with a Qts of 0.38 or lower. Any higher & you'll get the waterbed effect, with it getting vastly worse the higher the driver Qts.
Lower Q will result in a faster more precise response & better musicality, lower phase shift & group delay will also promote the very same. You can go too far though in which case you end up with aneamic bass :whistling:
Nice build by the way :bigsmile: Hope it all goes to plan!