<page_title> Line level </page_title> <section_title> Nominal levels </section_title> <table> <cell> Professional audio <col_header> Use </col_header> </cell> <cell> +4 dBu <col_header> Nominal level </col_header> </cell> <cell> 1.228 <col_header> Nominal level, VRMS </col_header> </cell> <cell> 1.736 <col_header> Peak amplitude, VPK </col_header> </cell> </table>
Professional audio at +4 dBu is equivalent to peak amplitude of 1.736 volts, or any general signal 1.228 VRMS.