Part of SPL’s “Professional Fidelity” series, the SPL Phonos Duo is a high-performance RIAA phono preamplifier crafted for serious vinyl enthusiasts and audiophiles. It refines the original Phonos design with expanded connectivity and greater operational versatility. Proprietary VOLTAiR 120V Technology: At the heart of SPL's design is an internal rail voltage operating at four times the industry standard. This extra power delivers: Expanded dynamic range Minimally lower distortion and noise Superior headroom, creating an effortlessly natural and transparent sound signature Dual Cartridge Compatibility: Fully supports both Moving Magnet (MM) and Moving Coil (MC) turntables. Tailored Cartridge Matching: Front-panel controls make precise load and capacitance adjustments effortless.