DIFFERENCES BETWEEN THE ORIGINAL A2 AND NEW A2+
* Optional USB DAC (digital-to-analog converter) is built in. Or use a DAC of your choice.
* Variable RCA output (to connect a subwoofer or wirelessly send audio to other speakers using the W3 wireless adapter.)
* Wall mount the speakers using standard 1/4" threaded inserts.
* Upgraded binding posts.
* Upgraded power connection and power supply.
* Upgraded accessory cables.
* Optional USB DAC (digital-to-analog converter) is built in. Or use a DAC of your choice. * Variable RCA output (to connect a subwoofer or wirelessly send audio to other speakers using the W3 wireless adapter.) * Wall mount the speakers using standard 1/4" threaded inserts. * Upgraded binding posts. * Upgraded power connection and power supply. * Upgraded accessory cables.