for a correct implementation of a sub you need to measure the frequency response at your listening position.
I have an 18db room resonance at 45Hz, so I have to use the highpass of the Devialet (50Hz, 24db/oct) to bring this resonance down. Now I have two regions where I need to add bass again, from 20 to about 43Hz and from 47Hz to maybe 130Hz. I let my sub (B&W DB1) play up to 120Hz and use a miniDSP 2x4HD to correct the bass response. The internal DSP of the DB1 is not precise enough and has some limitations, the miniDSP is a big step up. This gives a nearly linear bass response with only a smaller loss of 3-4 db in the range between 100 and 120Hz.
This is room dependant and would need a second sub to get rid of it.
But without measuring equipment you will not come to a nearly perfect solution.
I have an 18db room resonance at 45Hz, so I have to use the highpass of the Devialet (50Hz, 24db/oct) to bring this resonance down. Now I have two regions where I need to add bass again, from 20 to about 43Hz and from 47Hz to maybe 130Hz. I let my sub (B&W DB1) play up to 120Hz and use a miniDSP 2x4HD to correct the bass response. The internal DSP of the DB1 is not precise enough and has some limitations, the miniDSP is a big step up. This gives a nearly linear bass response with only a smaller loss of 3-4 db in the range between 100 and 120Hz.
This is room dependant and would need a second sub to get rid of it.
But without measuring equipment you will not come to a nearly perfect solution.
