Bear in mind also that the frequency response changes as the volume increases: bass is smoothed off as overall volume increases, to protect the bass amplifier channels from clipping or the woofers from overexcursion. This is frustrating as I find the HK system over bassy at low volume and then better balanced at about 60% of max volume.
All that said, the HK amp and 8" underseat woofers are quite good for factory systems and should produce enough >50hz bass to satisfy most people.
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