The IBX-R4 is positioned right at the centre of the Auditorium Series. It has all of the virtues of the Avatar R4 with added refinement and sophistication by virtue of our proprietary high-frequency driver and its associated filter network. The IBX-R4 is a mature and compelling musical companion that rewards on every level; equally at home whether playing at low or high volume levels, on simple or complex music, driven by basic or sophisticated amplification. A confident all-round performer, all genres of music can be experienced to their full potential.