Originally Posted by JustABrah
A sub plus a 2 way speaker is still a 2 way speaker design, not a 3 way, a sub doesn't make a 3 way design, handling the low and ultra low bass is not part of a 3 way design, having a tweeter to handle the highs a mid range driver to handle the mids and woofers to handle the mid bass and a cross over with this in thought.
2 way uses different woofers with the thought of them having to handle the mids and mid bass and a cross over designed for that, crossing those speakers over higher to just handle the mids isn't doing that speaker right cause that's not how it was designed to be used.
Not necessarily. When 3-ways were king, up to about 30 years ago, the typical woofer range was 40-500Hz, the midrange 500-5kHz, the tweeter 5kHz on up. They didn't go much below 40Hz because there was no program down there, so they didn't have to. That was a bit of a Catch 22, there wasn't much below 40Hz program material because no one had speakers that would go that low anyway.
It all changed with the introduction of subs in theaters, and the subsequent addition of LFE to DVDs, giving rise to the use of subs in homes. If I was to design a true full range 20Hz-20kHz 3-way today, which I have, it would run the sub 20-100Hz, the midbasses 100-2.5kHz, the tweeters 2.5kHz and up. Since the sub shares the same vertical footprint as the midbass and tweeter there would be no need to cross it lower than 100Hz. The result is a sub plus 2 way in one box.