Haven't tried the Cary, but love my RM9 mill with el34's. A great value and excellent sound quality.
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My vote is for the rm9,I've owned both but not at the same time.I'm just not a fan of the kt88 tube in general and much prefer the sweetness of the el34.
I also think the rm9 would be a better match to the 604's
Are the 604's stock or have they been upgraded by Great Plains audio along with the crossover networks.
Best of luck to you,