My AINOgradient 4-way active dipole speaker project was started in 2013 with Minidsp 4x10HD and ICEpower amps. Subwoofers are sealed and play to 150Hz. I changed upper mid and tweeters to planars and have been happy since then, and won "Best sound" award at a national diy event in 2014. Minidsp and amplifiers have had power on 24/7 almost without interruptions. In the spring 2023 the 4x10 broke (capacitor?) and I replaced it with a pair of Minisp 2x4HD. Speakers are connected to TV and AVR, they are a part of 5.0 HT set.