i have some XR200's... similiar design.. i use heavy back wall treatment, (diffusion and absorbtion) and space them 7 to 8 feet apart, facing pretty flat.... maybe 1 inch toe in....
i get a nice even coverage.
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Mcintosh 2300 - MCD500 - MC 601 - MC 2301 - MC XR200 - MC XR-50 - Bryston Model T - VPI HRX turntable - JL AUDIO f113 sub (x2) - JL Audio Crossover, Wireworld Cables, PS Audio P-10, P-5. 
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