Originally Posted by bossobass
Lower freqs have a longer decay time, regardless of alignment. One cycle at 40Hz is 25ms and one cycle at 10Hz is 100ms. All else equal, this will be reflected in decay times of different FRs.
I know you're trolling but let's look at this slightly differently.
One cycle at any particular frequency has little, or nothing, to do with SQ. They do not exist in isolation even in very large, organ, flue pipes. The difference is easily heard with an IB.
Every tone has a beginning, a middle and an end. Are you arguing that the attack, sustain and decay are identical
for every subwoofer with a matching FR? Or just that you
can't hear any difference in the way organ pipes begin to speak? How they hold their tone, waver, rise or fall? How they each decay in their own completely individual way? Often it has hardly time for a single 16hz sinewave to get out of bed let alone have its first coffee and cigarette.
Displacement has nothing to do with SQ. Displacement is merely insurance against bottoming. It is a waste by-product... unless you desperately need cone movement for air cooling your multi- kilowatt, pumping station.
Cone area matters far more than displacement where SQ matters. Wave a postcard by a full yard back and forth. Now wave an 8' x 4' panel by a tiny fraction of a millimetre. Their displacement is identical. Which size do you prefer for the reproduction of your favourite 32' ranks of organ pipes?
Hint: The postcard is a very poor impedance match with the air.
Small cone area with high displacement stirs the air violently. Large cone area with small excursion tightly controls the air movement with gentle finesse. Leading edge, sustain and decay.
The flapping, long-throw cone punches right through the air. Shadow boxing without impact. The air moves aside and around the pummelling fist.
A large surface area does not allow the air to flow around the outsides. It produces a perfect wave front. Why else would instruments and animals which speak very low be made very large? Leading edge, sustain and decay. Nature abhors the minuscule with deep voices. It doesn't know whether it's coming or going!
Imagine the form of a long sound wave. A huge, incredibly-lightly-inflated, sausage-shaped bubble.
Hit it with a small, hard punch and your hand goes right through. As if there were nothing there. That's your silly, flapping cone.
Now get your 8'x4' and see how you can make and move balloons as rapidly as you like. You have total control.
EQ-ing a subwoofer to get more bottom end power, than nature intended, is a violation of these principles. The cone must move violently to keep up the acoustic output with falling frequency.
Compare yours to our 8 x 15" (or larger) IBs. The cones never move. We have the equivalent of a bass
electrostatic membrane. What the geniuses can't achieve with huge, megabuck electrostatics we do every single day with one hand behind our backs on a 1000 watts. The money you spend on electricity buys our DVDs and CDs.