Product details

The SPL Audio Phonitor One d is a high-performance headphone amplifier and digital-to-analog converter (DAC) designed for professional audio monitoring, music production, and critical listening. Combining SPL’s analog amplification technology with a high-resolution USB DAC and the innovative Phonitor Matrix, it delivers detailed audio reproduction while helping listeners achieve a more natural stereo image through headphones. With balanced and unbalanced analog inputs, USB digital connectivity, and a dedicated line output, the Phonitor One d is a versatile solution for studio desks, home recording setups, and audiophile listening systems.

Key Features

Integrated 32-Bit DAC: Features an AKM AK4490 DAC supporting high-resolution digital audio playback up to 32-bit/768 kHz PCM.
DSD256 Support: Supports DSD playback up to DSD256 (11.2 MHz) through USB using DoP.
SPL Phonitor Matrix: Simulates aspects of loudspeaker listening through headphones, helping improve stereo imaging and mixing decisions.
Adjustable Crossfeed: Allows continuous adjustment of crossfeed intensity, while the virtual speaker angle is fixed at 30° and the center-level adjustment at −1 dB.
High-Performance Headphone Amplifier: Class AB push-pull output circuitry delivers clear, powerful audio with low distortion.
Three Stereo Input Options: Choose between balanced analog TRS, unbalanced RCA, and USB digital audio inputs.
USB Type-B Connectivity: Connect compatible computers and supported mobile devices for digital playback without a separate external DAC.
Dedicated Analog Line Output: Routes the selected input signal at unity gain, allowing connection to a monitor controller, mixer, recorder, or additional headphone amplifier.
High Output Power: Delivers up to 400 mW per channel into 47 Ω headphones, 330 mW into 250 Ω, and 190 mW into 600 Ω.
Premium Analog Components: Incorporates Burr-Brown OPA2134 SoundPlus operational amplifiers in the preamplifier stage.
Wide Frequency Response: Supports a specified frequency range of 10 Hz–200 kHz (−3 dB) across the analog and headphone sections.
Optimized Gain Range: A −10 dB attenuation switch helps adapt the headphone output level for sensitive headphones or high-output sources.
Class-Compliant USB Operation: Supports Mac and iOS devices without additional driver installation; Windows driver installation may be required for higher sample rates.
Compact Desktop Design: Combines digital conversion, headphone amplification, and monitoring features in a compact enclosure manufactured in Germany.

Technical Specifications

Product Type: USB DAC and analog headphone amplifier
DAC Chip: AKM AK4490, 32-bit
Digital Input: 1 × USB Type-B
USB PCM Sample Rates: 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384, 705.6 and 768 kHz
USB DSD Support: DSD64, DSD128 and DSD256 via DoP
Analog Inputs: 1 × balanced stereo 6.35 mm (¼-inch) TRS; 1 × unbalanced stereo RCA
Headphone Output: 1 × 6.35 mm (¼-inch) stereo TRS
Analog Line Output: 1 × stereo RCA
Maximum Analog Input Level: +22.5 dBu
Maximum Analog Output Level: +22 dBu
Balanced Input Impedance: 20 kΩ
Unbalanced Input Impedance: 47 kΩ
Line Output Impedance: 75 Ω
Headphone Output Impedance: 20 Ω
Analog Frequency Response: 10 Hz – 200 kHz (−3 dB)
Analog THD + N at 600 Ω: 0.002% (0 dBu, 10 Hz–22 kHz)
Analog THD + N at 32 Ω: 0.013% (0 dBu, 10 Hz–22 kHz)
Maximum Headphone Output Power at 600 Ω: 2 × 190 mW
Maximum Headphone Output Power at 250 Ω: 2 × 330 mW
Maximum Headphone Output Power at 47 Ω: 2 × 400 mW
Analog Dynamic Range: 121.5 dB
DAC Dynamic Range: 113 dB at 44.1/48 kHz
DAC THD + N: 0.0012% at −1 dBFS, 10 Hz–22 kHz
DAC Noise: −113 dBFS, A-weighted at 44.1/48 kHz
Internal Analog Operating Voltage: ±17 V
Headphone Amplifier Operating Voltage: ±19 V
External Power Supply: 12 V DC, 1.5 A
Power Adapter Input: 100–240 V AC, 50–60 Hz
Dimensions (W × H × D): 210 × 49.6 × 220 mm
Unit Weight: Approximately 1.45 kg
Manufacturing Origin: Germany