I was driving the DC with a 300B SET monoblock amplifier rated at 8WPC although realistically probably around 5 to 6 WPC. I am using a Marantz based tube preamplifier with 2 outputs. I also have a spare Antique Sound Lab tube preamplifier also with dual outputs. I recently got hold of a Conrad Johnson MF 2100 solid state amplifier (100 WPC) so I decided to try bi-amping the DC. The manufacturer says that the DC has no internal crossover on the midrange woofer-- the driver’s natural upper-frequency rolloff was used to integrate its output with that of the 1” tweeter, which had a simple high-pass filter to roll off its low end. The bi-amp was pretty straightforward. The 300b SET was connected to output 1 of the Marantz based preamp and powers the tweeters. The input of the ASL was connected to output 2 of the Marantz based preamp then its output connected to the CJ to control the level and power the woofers. So far so good although using the 300B SET alone to power both drivers produces a cleaner and airier sound noticeable during critical listening albeit a tad brighter. I am hesitant to use an external electronic crossover as it will add something to the signal chain. Note that the 300B SET can power the DC but adding the CJ enables it to play rock music with heavy hands. Just sharing. Let me know if you have other ideas. At some point, I will have level controls installed on the CJ so I don't have to use the ASL preamp.