Any less pricey options to the Sonance Symphony Extreme for in ceiling installation in a 6.5 x 7 x 7 foot sauna? I can find a lot of "weather resistant" options, but I can't tell if they would tolerate that degree of heat (130-170F). Surely all those sauna kits with speakers included are using something a few cuts below Sonance. Any help appreciated....I need to decide and install asap.