I'm surprised you hadn't noticed...they're stackable!!!
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Outlaw 990; Carver TFM45 (mains); Carver TFM35 (surrounds); Carver TFM24 (bridged for center); Carver TFM15CB (rears); Acoustic Research AR9 mains; Polk CS400I center; Polk FX500I surrounds; Polk FX300I rears; Sony KDS-60A2000; Oppo DV-981HD; MX-850