I knew 2-3 people would show up here to drop their snark-bombs on the topic of biamping, and I wasn’t disappointed.
It has been many years since I biamped, but when I did, it was a noteworthy success. It probably would have sounded even better if I’d had access to one of the excellent, transparent external crossovers that are currently available, but were not back then.
Obviously biamping isn’t possible or recommended for certain setups; but in the right setup, and with the right amps, it can take the sound way higher...