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.
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.