That is perfectly ok, Kalali, as long as the two sections of the speaker are not interconnected internally. And in that regard I see the following statement in the FAQ at the Vandersteen site:
The crossovers in Vandersteen bi-wirable speakers are engineered with completely separate high-pass and low-pass sections.
Also, by the way, the manual for my VAC amplifier states as follows:
If you bi-wire your system (run separate speaker leads from the amplifier to the high and low frequency transducers) you may discover that two different impedance taps work best. For example, with early production Martin Logan Sequel II we find that the bass speaker is best matched with the 4-8 ohm tap, while the electrostatic panel is best controlled by the 2-4 ohm tap. On later production Sequels we use the 8-4 ohm connection to both drivers.
Enjoy!
Regards,
-- Al