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PREMIUM SWITCHABLE OCTA-DAC CONFIGURATION: Engineered with eight Cirrus Logic CS43198 DAC chips arranged in an advanced Octa-DAC setup. This high-density architecture delivers extraordinary audio resolution, an expansive dynamic range, and class-leading channel separation, capturing every micro-detail of your high-resolution music library. INNOVATIVE DUAL DRIVE PLAYBACK MODES: Tailor your audio experience to your environment. Seamlessly switch between Quad-DAC Mode for natural, balanced sound with maximum energy efficiency (delivering up to 28 hours of battery life), and Octa-DAC Mode to engage all eight DACs for ultimate spatial detail, resolution, and performance. COLOSSAL 8VRMS BALANCED OUTPUT: Experience desktop-grade driving power in the palm of your hand. In Octa-DAC mode, the PD5 outputs a powerful 8Vrms via its 5-pole 4.4mm balanced connection (and 4Vrms via the 3.5mm unbalanced port), effortlessly driving demanding high-impedance headphones with majestic authority and dynamic scale. SMART ENVIROTUNE AMBIENT OPTIMISATION: Enjoy uninterrupted musical immersion. Using an integrated microphone to analyze real-time environmental noise, EnviroTune dynamically corrects frequencies in the background, restoring audio details obscured by external ambient noise without unnecessarily boosting the main volume. PROPRIETARY TERATON ALPHA AUDIO ENGINE: Developed through years of continuous research, Astell&Kern's signature audio solution removes power supply noise, optimises power consumption, and provides stable, distortion-free amplification to recreate sound that is incredibly faithful to the original studio recording. ENHANCED SIGNAL ALIGNMENT (ESA) TECHNOLOGY: Minimises group delay—the microscopic timing gaps that occur as different frequencies travel through internal circuitry. By aligning and synchronising all outgoing signals, ESA removes phase distortion to deliver a beautifully sharp, focused, and coherent audio image. INTELLIGENT DIGITAL AUDIO REMASTER (DAR): Breathe new life into standard digital audio files. DAR technology upsamples the sample rate of your tracks (converting PCM up to 384kHz and lower-resolution files up to DSD128), smoothing out digital edge and revealing a more natural, organic, analogue-like presentation. UP TO 28 HOURS OF BATTERY LIFE: Designed for extensive travel and long listening sessions, the high-capacity 4,000mAh battery provides a class-leading 28 hours of continuous playback (in Quad-DAC mode). When running low, USB PD 3.0 fast-charging restores full power in just 2.5 hours. ERGONOMIC "GRIP CONTROL" DESIGN: Sculpted from lightweight silver aluminium, the PD5 weighs just 198 grams. It features a curved 4.1-inch touchscreen display beautifully integrated into its chassis, ensuring comfortable, secure, one-handed navigation on the go. HIGH-SPEED STREAMING & WIRELESS HUB: Seamlessly stream high-resolution files over dual-band Wi-Fi (2.4/5GHz) or Bluetooth 5.3 (supporting high-definition codecs like LDAC, LHDC, and aptX HD). Features BT Sink to stream music directly from your smartphone, alongside full Roon Ready and Qobuz Connect integration.