Strongly advise against "self-tweaking"-- the manufacturer has spent lots of time working out the right crossover for your model! W/out a crossover, efficiency would increase but uniformity of sound could be lost; units have varying impedance ratings that, in turn, may vary across the sound spectrum (this is taken into account when designing the c-over). Likewise, with external tweaks you might lose the corss-over points... a mess! Best talking this over with Totem.
Cheers!
Cheers!