Palo Alto Audio Design Rhombus Speaker System - Wireless Speaker - Black (SA520APW) Enhanced Bluetooth Sound by Sample Rate Conversion. Lossless digital USB connection and digital amplification that gives you natural sound. High-end driver designed by speaker legend Peter Larsen. Digital signal processing for accurate crossover and wide soundstage reproduction. Wireless Speaker(s): Yes. PMPO Output Power: Yes. Frequency Response: Yes. Features: Digital signal processing (DSP), Clock, Alarm.