Back EMF - Sealed Enclosures
I have heard that Subs last longer in a sealed box due to the acustic suspension effects that limit the cone excursion.
However, doesn't cone excursion cause a "back EMF" - a "voltage" that the system sees to resist the current being supplied by the amp? Won't a sealed box be easier on the speakers, but harder on the amp becuase of the reduced EMF produced by the restricted cone travel? Won't the amp run hotter with a sealed box?
the increased dampening of a sealed enclosure will not make life harder on an amp. sealed enclosure actually have the highest power handling characteristics.
Here how I understand back EMF. This could very well be a misinterpertation:
The only real way for the speaker to create its own current is for it to move on its own. If a musical signal requires that a sub stop excurting (word?) at +10mm but the enclosure isn't appropriate and it underdampens the driver then it is going to move further than 10mm creating a back EMF. Thus, a poorly desinged box, whether ported, sealed, or anything else, can cause this to happen.