When we spent time in Spain I took my HD600 headphones and a decent DAC/headphone amp for both TV and music. The acoustics of the villas we rented were always attrocious; large, open-planned living room with high ceiling, bare walls, leather sofas, tiled floors with usually just with a small shagpile rug that we invariably rolled up and stored away due to it becoming a dust and fluff magnet. Even plugging in a decent portable speaker into the TV didn't make speech intelligible enough to turn the subtitles off. I dread to think what the RT60 was, probably close to 2 seconds!