Originally Posted by CrusherW9
So how does electronic music factor in to this? I mean aren't pads approaching a sort of "synthetic test signal"?
That song is only 35-200hz. Although I didn't listen to the whole thing.
The signal doesn't matter really. There are only two things that kill subs:
2) coil heat
Bottoming is pretty obvious because it will be moving lots and making clacking/clipping type sounds.
Coil heat is impossible to detect in most cases, until it's too late, which is why it is the # 1 killer of subs.
(Especially car subs, in a trunk, in the summer, during a demo session...)
There are two frequency ranges that heat subwoofer's up LOTS:
1) Single digit bass (approaching 0hz)
2) 50-300hz (mid-bass)
For a ported or horned sub, there is one frequency that will also heat the coil up, and that is the tuning frequency. Where excursion is near zero and it just sits and bakes, the port is the only thing letting the heat out. (Inadequately I might add.)
In fact most horned subs have such low excursion that they typically operate entirely in their thermal-zone above tuning. Imagine a Lambo that never leaves a stop light, sitting and rev'ing, the radiator fan is the only thing saving it; and last I checked... cone don't have fans or rads.
Single digit bass kills subs because the sustained power approaches the DC rail voltage of the amp (which has a high AC RMS equivalence. i.e. power-under-the-curve)
Mid-bass heats up coils because it is a high frequency, where again, excursion is near zero.
No air moving past the coil = heats up WAY faster. Nothing to get rid of the heat.
You can kill a 1000w sub with only say 200watts if the frequency is say 1-5Hz.
Or perhaps with just slightly more power after an hour's worth of jamming mid-bass continously.
and that's why we buy a zillion 18's and a zillion amps:
more coils + more heatsinks = better cooling (i.e. bassing for longer without any heating issues).
It's not magic.