try VTL 300 or 450
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The best tube amp I ever heard for the even bigger IRS was the Antique Sound Labs AQ1009DT. That was the new twin 845 output tube tower mono blocs. The effect on the Emims and Emits was magical. I wanted to buy the amps right then and there. TRELJA was with me and can tell you that it was the best he'd ever heard those speakers sound and he had heard them many times. Fabulous tone definition and soundstage. The woofers on the Betas are biamped as well aren't they. If not the external crossover will allow it, so that recommendation applies only to the panels, you'll need different solid state power for the woofer boxes.