loading impedance


I have a zyx r1000 cartridge, per the manufacture's web page, the recommended load is >100 ohms ( I would think there should be a exact # that the phono section should be set to). The preamp that I have is adjustable (with some effort). What should the impedance be set in the phono section? I have heard some complicated methods of checking impedance of cartridge etc. How does it affect sonic characteristics if I were to change from a 600ohm to 100ohm resister?
eralff
Sean and Thomas,

Thanks for the tips. I did the impedance settings when my Z1000 was brand new. Out of laziness, I didn't fuss with the Ono's settings. For a couple of days now, I have tried 47kohms (a bit too bright in my system) and 1000ohms (seems so far to offer what Thomas had mentioend in his post without the brightness.)

Eralff, if your cartridge is a new one, waiting a bit for the final impedance decision may be necessary. Mine is about 100 hrs. old. In another 50-or-so hrs. I'll give 47k another go.

Best regards.
In general, As you increase the resistance of the resistor you will get stronger high frequencies. The secrect is finding the value between too dull and too bright.

Radio Shack sells (or at least used to) an assortment of 1/4 watt resistors that should give you all the values you need. Once you find the value you like you can replace them with audiophile resistors if you wish.
Dear friend: The ideal is that with the correct load impedance the frecuency response of the cartridge will be flat, but you need some tools and instrument to do that. So, if you are experienced in live music then you have to trust in you ears: take 3-4 records that are your standard and that you know extremly well and try differents impedance values till you are satisfied. Remember that the impedance ( in phono cartridges ) function like an equalizer. Be carefully.
Best regards.
Raul.