The Ultimate High-Voltage Hub for Impeccable Headphone Mixing and Monitor Switching The SPL Phonitor 3 DAC + Expansion Rack Bundle represents the absolute pinnacle of high-resolution monitoring, designed specifically for top-tier mixing rooms, mastering facilities, and premium hybrid production environments. While standard monitor stations route signals through digital faders or low-voltage integrated circuits that squash transients and color audio, this system handles your entire front-end setup using SPL's 120V analog rails. By combining the flagship Phonitor 3 DAC with its hardware Expansion Rack, this package takes up just a 2U space in your 19-inch studio outboard bay, turning a standalone desktop amp into a full-scale routing command desk.
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Product Description
Flagship 120V VOLTAiR Core with Integrated SLP120 Filtering: The primary internal architecture of the Phonitor 3 DAC is engineered using SPL’s exclusive VOLTAiR 120V operating technology. Running on a massive ±60V DC internal power grid (four times the voltage ceiling of standard IC semiconductor op-amps), it delivers an unparalleled dynamic range of 141.4 dB. When digital signals leave the converter chip, they enter the analog world through the specialized SLP120 (Single Low-Pass) filter, which uses the same 120V technology to filter high frequencies cleanly. This creates massive headroom, eliminating clipping or thermal compression so your transients translate with exceptional punch and micro-detail.
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Premium 32-Bit AKM Velvet Sound Conversion: The digital-to-analog converter stage features the highly celebrated AKM AK4490 premium DAC chip incorporating Asahi Kasei’s signature Velvet Sound™ technology. This high-performance converter operates with 32-bit processing and handles pristine digital audio streams via class-compliant USB, supporting sampling frequencies up to 768 kHz PCM and native DSD256 (DSD4). Coaxial, Optical S/PDIF, and professional AES/EBU inputs handle high-resolution clock signals smoothly. The chip’s internal digital filters are meticulously optimized to minimize pre-ringing artifacts, ensuring an ultra-linear phase response and a jaw-droppingly transparent soundstage with zero digital harshness.
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The Phonitor Matrix and Advanced Diagnostic Workspace: Standard headphone monitoring forces an artificial left/right split that doesn't exist when listening to loudspeakers in a room. The Phonitor 3 DAC rectifies this via its fully variable Phonitor Matrix. Utilizing pure analog circuitry without digital DSP latency, it features continuously variable knobs for Crossfeed (interaural level difference) and Speaker Angle (interaural time difference up to a standard 30° placement). This lets you precisely dial in the exact spatial image of your physical studio monitors, allowing you to accurately judge panning, center-level balancing, and stereo width directly on headphones.
ProMusicals+ 1
Expansion Rack Integration with Passive 4-Way Speaker Switching: The structural Expansion Rack completely redefines the functionality of the device. Beyond serving as a robust 19-inch 2U rack housing with a sleek black faceplate, it integrates a high-performance, passive four-way rotary switch. This matrix expands the stereo output of the Phonitor 3 DAC into four separate balanced XLR stereo outputs. This lets engineers hook up, calibrate, and toggle cleanly between four independent loudspeaker pairs (such as full-range mains, midfield monitors, nearfield references, and consumer test grids). Because the switching operates 100% passively, there are no active electronics, extra power supplies, or coloring components added to your monitoring line.
ProMusicals+ 2
Key Features
COMPLETE MONITORING BUNDLE: Merges the world-class Phonitor 3 DAC headphone amp/monitor controller with a matching 19-inch 2U Expansion Rack.
Tanotis
120V VOLTAiR POWER RAILS: High-voltage operational amplifiers (±60V DC) yield an incredible 141.4 dB dynamic range with near-infinite signal headroom.
PASSIVE 1-TO-4 SPEAKER SWITCHING: The Expansion Rack's front-panel rotary switch passively routes your master stereo signal to up to 4 stereo monitor pairs with zero signal color.
ProMusicals
32-BIT / 768KHZ AKM DAC: Premium AK4490 Velvet Sound™ converter chip handles ultra-high-resolution PCM and native DSD256 digital formats effortlessly.
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VARIABLE PHONITOR MATRIX: True analog speaker-emulation crossfeed controls simulate realistic cross-talk and 30° placement angles on headphones to prevent ear fatigue.
Sound On Sound
COMPLETE OUTBOARD DIAGNOSTIC RIG: Front-panel tactical hardware toggles provide instant Mono summing, Polarity Phase Inversion (L/R), and Left/Right channel soloing.
Sound On Sound
PREMIUM ALPS RK27 POTENTIOMETER: Large, high-mass 45mm aluminum volume control drives a motorized tracking cell for perfect stereo channel balance.
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DUAL BACKLIT VU METERS: Mechanical level meters display incoming hot mastering levels accurately, equipped with selectable sensitivity pads (-6 dB / -12 dB).
