Cartridge Impedance


I just bought a phono pre-amp that allows me to adjust the impedance of a MC cartridge. I was using 100ohms. Now I want to experiment.
Could someone tell me the effect the trebles will have if I lower or raise the suggested impedance. For example, If I raise the impedance will the highs be more prominent or less prominent? 
Thank you.
jmh128

Showing 1 response by quincy

I have no intention to hijack this thread.

One more question please?

Its has been my understanding, for many years, that adjusting or tuning the impedance (resistance) on a phono stage for a MC cartridge also helped with dampening of the bass speaker cones.  It can reduce the 'springiness' of the cone and help unmuddy the low end.
Is this correct?  
Thanks!