I have the 120's. The MKII is not necessary with the SLP98P because the preamp has enough gain in it. The only mod I've had done to the amp was getting hi-performance hexfreds and Cardas caps installed. Oh, the faceplate is painted differently on the MKII. If you have the SLP98P, the 120's is a fantastic amp to go with it. I traded a V12R for it. Great amp, but it ran hot enough to cook hamburgers on. Best of luck.
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