For users who want to add low-end extension, the HD4 Next Gen allows connection of a subwoofer video the RCA analog outputs. Audioengine recommends pairing it with their S6 or S8 subwoofers, but any ...

There is also aptX HD Bluetooth support for high-quality wireless streaming. Further, HDMI ARC is on the menu if you're planning to connect your amp to your TV for a home AV system, with Rotel ...