miniDSP has some nice active crossovers for different price ranges, just found them in the last week.
I also have good experience with custom made Linkwith crossovers via aliexpress. You can choose the frequency and upgrade the operating amps. I took Muse8900 this time, but before even the Muse02 from italy. Quality was really good to be honest! I have put it before two Nap200 going to B&W PM2. For this speakers clarity increased and I could play louder in biamping.
For my Elac507 Biamping didnt work! I think the reason is that the impedance of Low and High is different themself. In Biamping mode i had far too much bass. First i didnt like the speaker. When stopped biamping te sound became a dream. So i am out of biamping :) just got a Primare A32 with 2x400 Watts at 4Ohm and all is perfect. The only thing I will do is to go on wi-wire for the High-channel. I tried that once with Kimber 4TC and the effect was nice for the mid and high range, but it was not my cable.
I also have good experience with custom made Linkwith crossovers via aliexpress. You can choose the frequency and upgrade the operating amps. I took Muse8900 this time, but before even the Muse02 from italy. Quality was really good to be honest! I have put it before two Nap200 going to B&W PM2. For this speakers clarity increased and I could play louder in biamping.
For my Elac507 Biamping didnt work! I think the reason is that the impedance of Low and High is different themself. In Biamping mode i had far too much bass. First i didnt like the speaker. When stopped biamping te sound became a dream. So i am out of biamping :) just got a Primare A32 with 2x400 Watts at 4Ohm and all is perfect. The only thing I will do is to go on wi-wire for the High-channel. I tried that once with Kimber 4TC and the effect was nice for the mid and high range, but it was not my cable.