a lower ohm speaker, means either
A, you will have to buy a more expensive receiver, because the speakers will want more total power from the speaker..
or
B, your speakers will never be as loud, as they possibly could be, because the receiver you bought can not provide the necessary power the speakers would want at a high volume.
JohnK's post is 100% correct, but for those that are not mathematically inclined, its just a bunch of gargle... i know..
if you have 2 speakers that are the EXACT same, accept for the impedance, they are not the EXACT same, there is something in the 4ohm speaker, that is different than the 8ohm speaker, either an extra resistor has been placed inside of the speaker, or something else has been done to modify the power capabilities of the speaker, the driver, or (speaker) could be the same, and sound the same, but one will most likely be louder than the other one, the louder being the one with the lower ohm rating, because that speaker will be able to handle more power, and more power=more volume, as we all know
hope this helps someone.
