acoustic system radiotehnica s90, 35 s-012. soviet vintage audio equipment. musical columns made of plywood

35 90 1985 acoustic acoustics ancient antique back background bass brick broadcast brown decoration electronic engineering factory grids loud lowfrequency midfrequency music musical nominal object old pattern player powerful preservation radio radiotehnica record reflex retro riga russian s90 sound soviet speaker speakers subwoofer turntable twitter ussr veneer view vintage volume wall watts wooden