Yes as we discussed many years ago, weak is a relative term

26Hz is 26Hz but most do want more SPL to take their low bass CDs for a spin. I know I do - I now match my Marble 9.0s with hybrid VMPS larger subs - 12" Megawoofer >> 8" Vifa
But for casual listening while working in the computer, these old nOrh subwoofers might do for some...