Inakustik, obviously. Have you read the threads about it here?
McIntosh MPC500 vs Inakustik 3500P
If you were to choose between either the McIntosh MPC500 and the Inakustik AC-3500P Power Conditioners, which would you take?
https://www.mcintoshlabs.com/products/specialty-products/MPC500
https://www.in-akustik.de/en/cables-and-accessories/power-supply/power-filter/reference-power-station-ac-3500p-00763500/
https://www.mcintoshlabs.com/products/specialty-products/MPC500
https://www.in-akustik.de/en/cables-and-accessories/power-supply/power-filter/reference-power-station-ac-3500p-00763500/