After several test configuration (2 sources (CANAL + and TVOrange), 4 cables (1m, 2m, 2x7m50), 1 "extension" adapter), I found the right formula (source - 7m50 for each source - Adapter F / F - 2m - KÖNIG HDMI REPEATER - 1m - TV). Some configurations do not work, do not hesitate to try to reverse the cables. Remember to respect the IN / OUT direction. ATTENTION: in the end, my home, it does not work when the power supply (included) is connected, and it works without. But maybe the opposite will be true to you. Anyway, good product, I recommend.