Large capacitor tuning technique

I have applied large capacitor tuning technique, by series a large capacitor to the woofer, to my closed speakers. In theory, it states that this action will result in changing the slope of the bass response from 12dB/octave to 18dB/octave. So, does it mean my speakers now will produce bass response close to the Third-Order Quasi-Butterworth of the vented box? And how about the transient response? Will it behave like closed or vented box?
 
I'll start the ball rolling by adding more information regarding your 'Third-Order Sealed System'.

The effect of the large series capacitor on the bass response is shown below.

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