Herman, the reason we make balanced equipment stems from my experiences in college, setting up Neumann microphones in the music hall. We ran 150 feet of interconnect. That's not something you can do with single-ended- too much high frequency loss. It was a simple leap to see that there would also be an advantage to balanced operation in the home. You'll note that I am not trying to sell this guy anything- he already has the equipment.
Even if the highs are rolled off out-of-band, phase shift occurs in the audio band. This can be audible. Additionally, SE cables are more prone to noise pickup, Maab has an opportunity to prevent noise pickup (which can obscure detail).
To run balanced lines you either use XLR connectors or 'stereo headphone' connections. The latter are more commonly seen in semi-pro gear for musical instruments and recording. XLR is the preferred connection.