I heard great feedback re Inakustik AC-3500P and contemplate on buying this filter, feel more confident to hear good feedback from another user.The 15A’s two 12” dynamic woofer drivers, each powered by a 500W class-D amplifier, produce a solid low end. The EAR V20 excels at imaging, and is capable of driving the panels to produce a full sound that fills up the room, e.g., music from a large orchestra. I recently purchased the Inakustik AC-3500P power filter. It raised the system to a new level. Later this year a friend will bring over a Ypsilon Phaethon integrated amp to try, but I’m so happy with the V20 I can’t imagine making a change.