My answer to your question is that while there may be cheaper and easier solutions available, the best sounding approaches to bi-amping are neither. IMO.
I use QSC 500 watt/ch amp for my bass horns, <100 Hz, but my Marchand xover is much better sounding than the built-in on the amp when it comes to evaluating what comes out of the mid and tweeters. (BTW, I actually prefer passives for the mid and tweet crossovers in my system. YMMV) Remember, everything goes through that circuit on the amp, not just the low end, and as others point out it wasn't built to audiophile standards.
Still, the amps are built like tanks for the use we might put them through in home systems. If I didn't already have a Classe 301 in my theater for the mains I would consider using a QSC amp for that application as well.
I use QSC 500 watt/ch amp for my bass horns, <100 Hz, but my Marchand xover is much better sounding than the built-in on the amp when it comes to evaluating what comes out of the mid and tweeters. (BTW, I actually prefer passives for the mid and tweet crossovers in my system. YMMV) Remember, everything goes through that circuit on the amp, not just the low end, and as others point out it wasn't built to audiophile standards.
Still, the amps are built like tanks for the use we might put them through in home systems. If I didn't already have a Classe 301 in my theater for the mains I would consider using a QSC amp for that application as well.