What are your dsp settings and filters running on the Focal woofer channels.
What frequency range do to run the
1, Sub eg 0-xx
2, Focal woofers xx - xx
3 Match mid bass / tweeters xx -20,000
Do you run them in phase or out of phase with mids and sub ? ( phase transition at either end can cause dips if phase transition is wrong )
And did you go for 2 ohm or 4 ohm versions of the Focals ? ( match amp will have more transient power available driving 2 ohm versions )
Or it could be simply gain on Subwoofer is too high not allowing the focal woofer blend and keep up volume wise in that transition between sub bass and bass.
I could recommend what I run as can get great impact from the underseats but the dsp tune is essential to get this to happen.
Graphs of RTA response will help here as a number of us can comment and suggest if your tune is optimal before doing woofer replacement.
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