my speakers seem to make a non musical distortion but it only seems to be on certain notes or with certain pedals? could it be the frequencys of those notes showing the speakers faultiness? are they either blown or not blown? is there a middle ground where it replicates sounds within certain frequencys perfectly but others kill it? :?:

:? Yep they can be "partially" malfunctioning.

Sometimes very old and long played elements have problems with those flexible wires that go to voice coil from soldering terminals. They just have breaks, causing crackle and pop. You can try to fix them by carefully soldering broken hairthin wires one by one, which is not easy. You maybe can give their live back for a gig or few rehearsals, but not long. I dont know if this special wire is available, a local music store once years and years ago supplied it for me. Maybe with surgigal knife, steady hand and fearless mind and rubber cement you can do some succesfull operation.

If voice coil is damaged or twisted it may mechanically touch the magnet. Remove the speaker from the enclosure and ceck for visible damages in cone, spider and surroundings, or loose dustcap. If you gently shake the speaker maybe some loose parts are between voice coil and magnet. Try pushin gently and evenly the cone with your fingers and try feel if the voice coil touches somethin it should not.

But your description might match just as well for power supply cap or output stage problems in solid state amps or something with tube amps. Check your speaker with another amp, which works well for sure with other speaker.

Check links from ampage, I remeber readin something somewhere about how to fix a speaker with slightly misplaced voice coil.

Misplaced VC.
 Damaged slightly, otherwise sounds good.
 Only does that ..coil shake..sound is during load at certain frequencies, particularly with distortion that has pronounced harmonics.
 It got a few blasts of scritch when it was used as a test speaker...
 As long as I don't drive it more than meduim hard it's fine...knock on wood...I use this one in a 2x12 cab everyday.