i believe that room EQ's, like the mac, target this issue in the 200 to 300 hz range... its a typical issue with modern living sized rooms...
if you use a crossover, you can position the point to target this range.. or buy some GIK panels.. problem solved.
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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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