Re: Possibly blow speaker?
Its perfectly fine to power speakers off a home receiver at moderate volume levels. I wouldn't free air a speaker at half volume, but turning it up a little to hear how it sounds wont hurt anything.
If the speaker didn't blow, its possible it was damaged from bottoming out. You can tear spiders, surrounds, and even damage the coil former if it contacts the slug.
I like to HPF my main speakers around 80-120hz depending on how well my subs play in the higher range (80-100hz)...
'65 VW Bus
(2) PG Ti 12's, (2) Aura Sound 8's, (2) SoundStream 6.5 coax, (2) Alpine Type-S 6x9's [rear fill], MBQ DSC1500.1D, RF 501X
'02 BMW 330xi (AWD coupe)
Harman/Kardon 12-speaker System Option - sounds good =)