Prefabricated house, poor sound insulation

PhoneStar ST Tri

Are soundproofing panels made of cardboard filled with sand. Similar things have been and are being used for years in HigHEnd speakers and work great ... We got to know them while looking at the reference house, should work well according to BU.

Similar things have been and are installed in HiGEend speakers for years

That's funny. The high-end manufacturers install all sorts of things (and develop rather little themselves). Hawaphon, by the way, too – that's how I first came into contact with it when I was still "distributing" high-end. The smaller the manufacturer, the crazier the "special materials" from other industries. The Phonestar basically also looks decent, unfortunately the links to the technical data don't work very well.