Visaton 2015 fr 7 round full range speaker 4 ohm visaton 2015 a compact size round miniature speaker from visaton includes a balanced frequency response from 130hz high efficiency and very good high range response making it suitable for machines and other equipment where space is at a premium typical applications include control speakers for electronic devices narrow network column speakers model construction and electronic musical instruments visaton 2015 fr 7 round speaker 4 ohm full