I made several home made speakers the last week with varying coils of wire (Some very short) and some long... the most basic was about 20 coils of 36 gauge wire around a soda cap. I plugged that into my Outlaw RR2150 and held it over a very large magnet. It worked. what is the resistance of the coil? like 0.01 Ohms. Over the magnet? Like 0.1 ohms. Did it work? Yes. Did the wire melt the tape around it? Sure, 36 gauge wire gets very hot very quickly.
More importantly -- the amp was fine. Resistance of your speakers vary a ton. As long as your sound is OK that means the current draw isn't being maxed out and your amp will be fine, even if you plug in a coat hanger. Just take it easy on the volume till you have tried things with broad dynamics.