Say your cartridge is 10 ohms and the SUT was designed to load a 2.5 ohm cartridge. This means that the low end bandwidth will be two octaves less due to the fixed inductance. Depending on the design choices and system matching this could be a good or a bad thing.
So if the SUT designer chose to put the -1dB point at 10hz for a 2.5 ohm cartridge, it will be -1dB @ 40hz if fed from a 10 ohm cartridge which might be an issue. If however the design were to be -1dB @ 3hz with the 2.5 ohm cartridge, the 10 ohm source will move the -1dB point to 12hz.
dave
So if the SUT designer chose to put the -1dB point at 10hz for a 2.5 ohm cartridge, it will be -1dB @ 40hz if fed from a 10 ohm cartridge which might be an issue. If however the design were to be -1dB @ 3hz with the 2.5 ohm cartridge, the 10 ohm source will move the -1dB point to 12hz.
dave