that is not a stupid question at all, it is better that you know and not guess and hope for the best, right?
anyway, there are very few amps that can handle a 4 ohm load without heating or working a little too hard and clipping or go into protect mode.
you may want to steer clear of that unless your amp can handle it. cheers
How can you say there are "few amps" that can handle a 4 ohm load? There are and have been for many years a WIDE selection of amps that can handle 4ohm loads.... are you sure you did not mean not many receivers ?