I do not use a splitter
Here are some pointers that I found on the Net.
Bi-wiring can improve clarity and openness, with less grain and more solidity
to the bass. Two cables are required for each speaker that you bi-wire.
Bi-amp
Passive bi-amping offers a dramatic improvement in clarity, openness and
detail, with much better bass solidity and definition. The presentation of music
and movie soundtracks is simply more intelligible and transparent.
With passive bi-amping, the speaker’s internal passive crossovers remain
connected. An external electronic crossover is not required and cannot be
used (there is no direct electrical access to individual drive units). This saves
expense and setup difficulties. Passive bi-amping optimizes your speaker to
achieve the best possible high-end performance. To bi-amplify, two power
amplifiers are required. Connection can be either vertical or horizontal.
IMPORTANT! When bi-amping, always use amplifiers with identical gain.
If uniform amplifier gain is not maintained the speaker-to-speaker balance
will be incorrect when vertically bi-amped, or the speaker system’s frequency
balance will be incorrect when horizontally bi-amped. To prevent problems
use identical amplifiers (Brand and Model) and in identical operating modes
(single channel or bridged).
Vertical Bi-amplification dedicates one amplifier to each speaker. This
configuration provides complete channel separation, which optimizes your
system’s imaging ability. Connect your speakers to one amplifier at a time.
Horizontal Bi-amplification dedicates one amplifier to your speakers’ mid/
low-frequency inputs and another to their high-frequency inputs. This configuration
can maintain better clarity when listening at loud levels—if lowfrequency
demands cause amplifier clipping, distortion will still be kept away
from high-frequency drivers.
Regards Robert