Maybe so. I'm not super well-versed in the subject of loudspeakers, but maybe one can add a resistor of the appropriate wattage to increase the impedance to 8Ω?My only comment is that they are very loud, I had to turn the speakers down individually all the way from within the Sound control panel, otherwise, even with the master volume set to near minimum, they were quite blasting. Perhaps 4Ω is too low an impedance?
Hmm. I don't see a reason why a resistor (of decent quality) should have a negative influence on the frequency response of an amplifier speaker combination. Usually a (decent) resistor has an clearly better Q-factor than a good speaker, meaning its capacitive and inductive components are negligible, hence largely independent of frequency.As a load you could test an amplifier with a fixed resistor but a resistor in series with a speaker would probably alter the frequency response of the speaker.
You could try it in order to bring the volume down a bit but it's not a 8 ohm speaker; it's a 4ohm speaker in series with a 4ohm resistor.