NS1000 box simulation
Copyright 2011 Troels Gravesen

NS1000 bass driver TS data.

Crosscalculation of TS data in LspCAD doesn't jeopardise the measured data despite leaving in the felt material in cabs.
As can be seen we have approx. -3 dB at 50 Hz and a 2nd order roll-off compared to 4th order roll-off for vented systems.

If we apply the as-is crossover we get the above response, a significant bump at 100 Hz.

Here's the impedance profile from driver with crossover.

Impedance may be smoothed by 550 uF + 18 mH + 6R8 across terminals.

If we use the notch filter we have this predicted response.