According to cartridgedb.com, the Output Impedance/Coil Resistance of the XX2 is 6 ohms. Using the 25x rule (+/_ 50%) the optimal loading for that cartridge should be 25 x 6 ohms = 150 ohms. +/_ 75 ohms or in other words somewhere in the range of 75 ohms to 225 ohms.
To use this method, start at the lower end of the range (75 ohms or so) and listen to the bass. It will be strong enough, but a little sloppy (not tight.) Next, try 100 ohms, again listen to the bass. It should be tightening up (at least a little) and still be very strong. Now go up to 150 or 175 ohms, The bass will still be tight but deminished in power. The frequency balance will begin to seem mid-rangey, or even bright. You need to back down, probably to 125 or 120 ohms to recover a tight strong bass.
It's all about picking the right gear for the steepness of the hill you're trying to climb -- so you get the most out of your engine. With cartridges, you're trying to find the impedance match that delivers the most voltage to your phono preamp.
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To use this method, start at the lower end of the range (75 ohms or so) and listen to the bass. It will be strong enough, but a little sloppy (not tight.) Next, try 100 ohms, again listen to the bass. It should be tightening up (at least a little) and still be very strong. Now go up to 150 or 175 ohms, The bass will still be tight but deminished in power. The frequency balance will begin to seem mid-rangey, or even bright. You need to back down, probably to 125 or 120 ohms to recover a tight strong bass.
It's all about picking the right gear for the steepness of the hill you're trying to climb -- so you get the most out of your engine. With cartridges, you're trying to find the impedance match that delivers the most voltage to your phono preamp.
.