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In Reply to: RE: You keep asking but won't accept the answer posted by milpai on October 07, 2016 at 07:09:05
Go over to Madisound and pull up the data sheet on any 6.5" woofer. They start rolling off at around 90-100z. At 30hz you're at -18db SPL. Even the manufactures that boost up their specs and even LIE say it's maximum range is 45Hz. And at 45Hz that's STILL -10db with a signal generator. Bass ain't happening Friend!
Follow Ups:
The measurements of a raw driver don't tell the whole story because they don't take into account the effect of whatever enclosure you're using (how it uses the backwave). There's one thing you can't get around, though, and that's that you must trade cone diameter for excursion and speakers get less and less accurate the more you move the voice coil.
Small drivers can theoretically go very low and some do go quite low. The problem is they can't do lows at high levels and then you couple that to the way our ears work(see Fletcher/Munson). Our ears are way down at very low frequencies at normal loudness levels. So you need lots of air movement to hear low bass even when it's there meaning you need lots of area on the bass drivers.
The human does not work like a SPL math formula. It works by physically being pushed by sound waves. At those frequencies you need a lot of air push.
As for distortion what about the effect of coherence using multiple drivers. That isn't any better than a single larger cone.
Like most things a trade off. It's easier to get a lower free air resonance in a big driver since the cone is heavier. But multiple drivers being smaller are easier to get rigid for reduced breakup and lots of voice coils, even if smaller, may handle more power. Then again longer throw is simpler on a large driver.
By the way for what it's worth I use an 18" driver. Then again the designer of my woofer in his next design used 2 10" woofers.
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