This seems to be the biggest issue I find with audiophiles. Many think their system is closed and only somewhat dependent on their room. Some will will throw thousands of dollars at magical cables and power conditioners while applying wall treatment like it was art, with a few 1" thick absorbent panels. It's all so silly.
I have spent 30+ years as a recording/ mix engineer and have built 4 studios in that time. The first two were DIY and sounded like it. The 3rd and 4th were both designed by Francis Manzella who really knew how to get the most out of a room. Without a purpose-built listening room it's unlikely most homes have a floating room with very good ratios and built with multi-layer, heavy, damped construction. My current listening room has those qualities and it still required 32 tuned Helmholtz resonators in the corners, broadband membrane traps against the front wall, RPG Diffractal arrays across most of the back wall, and 4" 703 clouds over about 80% of the ceiling and 70% of the side walls. That treatment takes into consideration that the low frequency modes will already be well spaced and the treatment only enhances what is already a very even room. Much of it is invisible. It's not speaker wire lifted off the ground. It doesn't look like I tweaked it. It's only a starting point. To sweat microscopic details in a room fundamentally poor at reproducing a flat frequency response is sort of a hallmark of the audiophile community and is the reason folks poke fun at it. The dollar amount tossed around in the video sounds conservative for a really good room and has to assume symmetry, good ratios and dimensions, and really good building technique. But people would rather argue about what kind of wood makes an amplifier rack sound best.
I have spent 30+ years as a recording/ mix engineer and have built 4 studios in that time. The first two were DIY and sounded like it. The 3rd and 4th were both designed by Francis Manzella who really knew how to get the most out of a room. Without a purpose-built listening room it's unlikely most homes have a floating room with very good ratios and built with multi-layer, heavy, damped construction. My current listening room has those qualities and it still required 32 tuned Helmholtz resonators in the corners, broadband membrane traps against the front wall, RPG Diffractal arrays across most of the back wall, and 4" 703 clouds over about 80% of the ceiling and 70% of the side walls. That treatment takes into consideration that the low frequency modes will already be well spaced and the treatment only enhances what is already a very even room. Much of it is invisible. It's not speaker wire lifted off the ground. It doesn't look like I tweaked it. It's only a starting point. To sweat microscopic details in a room fundamentally poor at reproducing a flat frequency response is sort of a hallmark of the audiophile community and is the reason folks poke fun at it. The dollar amount tossed around in the video sounds conservative for a really good room and has to assume symmetry, good ratios and dimensions, and really good building technique. But people would rather argue about what kind of wood makes an amplifier rack sound best.