Biamping, yes or no?

"You might get a second W4S STP/SE preamp, and use one preamp each for left and right channels. Use the balance control on the preamps to fine-tune the balance of low and high pass. Use one stereo amp each for left and right channels. You'd have to use Y-splitters on interconnects from sources to preamps."

No offence at all, but I disagree. The preamp is so vital to good sound, you would be far better off upgrading to whatever you can get for 2x the price of the W4S, instead of buying 2 of them. Same thing for the amp. I think you would have much better results if you just upgraded to 1 really good stereo amp or a pair of mono's. There are a lot of technical issues you have to deal with when you biamp. For example, you will almost certainly need to get an active xover. Just putting something like that into your system can do more damage to sound quality than the extra amp(s) can provide from the biamp in the first place.

"For example, you will almost certainly need to get an active xover. Just putting something like that into your system can do more damage to sound quality than the extra amp(s) can provide from the biamp in the first place."

But, generally, passive XOs have a more deleterious effect that active XOs.

My point was that you might be able to use the balance controls on your preamps to perform the same function as an active crossover. Also, the channel separation is perfect with separate preamps for each channel. Lastly, you use the volume controls to adjust balance between left and right speakers at the listening position.

Biamping is useful for live pro sound, but not so much for home audio, unless using "active" speakers with built in amps which can work fine (home recording studio monitors...save space). Otherwise, there are many good reasons why almost nobody does that, one of which is it usually doesn't sound better. I'm in the camp of using well designed smaller amps to get more bang for the buck, as lower powered amps from the same maker can have the tone mojo without wasting money on unnecessary extra wattage. Modern well designed passive crossovers from well regarded designers usually sound great...to believe otherwise is silly.

Wolf_garcia: Just to clarify, the method which I propose DOES IN FACT use the passive crossovers in OP's Tyler Acoustics D1 speakers.