AudioQuest 500 Series Banana Silver Speaker Connectors (BiWire - Set of 6) furn-off-desktype-ret The PP 4 uses a

The PP 4 uses a shielded USB cable and recording level control

or recording device

allowing both streaming to the amp and transmission to compatible headphones

so you can skip to a different song in the middle of a side

Bluetooth antenna

AudioQuest 500 Series Banana Silver Speaker Connectors (BiWire - Set of 6) furn-off-desktype-ret The PP 4 uses aFits up to 9 AWG Speaker Cables One piece solid High purity Pure Purple Copper instead of inferior sounding multiple pieces or brass. Especially pure "Hanging Silver" or "Hanging Gold" directly plated without normal sound damaging intermediary layer. Cold Welded connection instead of inferior sound damaging solder.