With my four keyboards I use, the MS-20K(it), it does not need the lows, the Sledge 2 does not really care either, but my Blofelds are missing something in the lows. I can not put a finger on it.
Will look into the link you sent me, as I am in Canada, I hope shipping is not insane!
As a synth player and not a keyboard player per se, I do not even know what the term AP (acoustic piano??????) means, but ask me about modulation matrix, and boolean operators on a Blofeld and I am all over it!