No, that is not necessarily true; it is quite likely that the amp will put out as much or more power at 16 ohms. SS amps TRY to double their output every time the impedance is halved so the Sugden will struggle more with the 4 ohm load than higher ones as it does not have the power supply etc to double its power. Try setting the speaker at 16 ohms and listen beginning at low volume.
Is it hard on my amp to be driving 4 ohm speakers?
I'm a poor audiophile. My gear is very old. I have a Sugden A 28 amp and Epi M201 speakers. The speakers have a switch on the back that only gives you the choice between 4 and 16 ohms. The amp is class A, so it runs hot to begin with. The speakers don't seem to be very efficient, requiring lots of volume for best sound. I've searched for info on my amp with no luck. I'm guessing it's around 35 wpc into 8 ohms. AND I'm also assuming it would be a bad idea for the amp to set the speakers at 16 ohm. Am I right? Is my amp designed to handle driving 4 ohm speakers at high volume?