Your Marantz 1090 is 45W+45W & the Yamaha P2200 is 100W+100W into 8 ohm speakers. I recomend bi-amping and yes, discreet preamps are better. Use a Marantz 3800 if available, otherwise try the 3600. By the way, your ears would be the best judge of better sound. As these models are old, keep in mind that dry caps can make one model sound better than the other.
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