If I may suggest:

Since you rent, and all other things considered, you might be better off using a wireless stereo-audio (with or without video) sender (RF transmitter/receiver).

The fidelity would be at least as good as with 50' of cables, and a LOT neater without cables stretching around the rooms, along the hallway, and down the steps.

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Larry Fine
www.fineelectricco.com
My system