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PORTED tight bass Recommended volume [cu.ft] deep bass 2.0 [cu.ft]: Port (d . l) 3.5" . 7" 1.5 [cu.ft]: Port (d . l) 3" . 7" 1.0 [cu.ft]: Port (d . l) 2.5" . 7.5" FREQUENCY (Hz) RESPONSE (dB) Use 21 mm (3/4 inch) thick Medium Density Fiberboard (MDF) or High Density Particleboard. Recommended Enclosures *W, H, D..................External Dimensions Recommended Enclosures .. SEALED 1.0 1.5 2.0 0.8 1.0 1.5 10 50 100 500 70 75 80 85 90 95 100 1.5 [cu.ft] 1.0 [cu.ft] 0.8 [cu.ft] FREQUENCY (Hz) RESPO