SPL AUDIO Phonitor xe Our nonplusultra headphone amplifier.
Home / SPL AUDIO Phonitor xe Our nonplusultra headphone amplifier.
Home / SPL AUDIO Phonitor xe Our nonplusultra headphone amplifier.
The Definitive Reference Amplifier for the Ultimate Headphone Purist
While other high-end amplifiers pull double duty by splitting tasks between power amps and headphone configurations, the Phonitor xe is built with singular focus. It is our nonplusultra headphone monitoring ecosystem, designed solely to convert audio signals into perfect acoustic headphone playback without compromise.
By dedicating 120V high-voltage rails exclusively to the headphone output driver stages, the Phonitor xe ensures an entirely isolated analog environment. The signal paths are optimized for instantaneous current delivery and ultra-low noise floor characteristics. It serves as the ultimate desktop companion for audiophiles, recording artists, and mastering engineers who require flawless, high-resolution translation across their premium headphone arrays.
The Power of 120V VOLTAiR Headphone Drive:
The foundation of the Phonitor xe’s incredible realism and effortless dynamic authority is SPL’s signature VOLTAiR technology. Running on an internal plus/minus 60V DC high-voltage rail network—four times the operational ceiling of standard consumer and pro-audio headphone gear—the Phonitor xe achieves an ultra-wide dynamic range. This high-voltage headroom allows the amplifier to handle sudden musical peaks or extreme bass transients without hitting internal compression walls. Music retains its complete structural shape, spatial timing, and effortless macro-dynamics, keeping playback smooth and completely free from listening fatigue.
The Phonitor Matrix – Loudspeaker Simulation Framework:
Traditional headphone listening forces an artificial left-and-right channel separation that creates a "super-stereo" effect, causing rapid mental fatigue. The Phonitor xe solves this with its acclaimed all-analog Phonitor Matrix:
Crossfeed Control: Replicates the interaural level and time differences between channels, mimicking the natural sound-wave bleeding that happens when listening to physical monitors in an open room.
Angle Control: Configures the simulated placement of the stereo soundstage, letting you toggle between 15, 22, 30, or 45-degree speaker angles.
By engaging this pure analog circuit, the music shifts out from inside your head and opens up into a realistic, three-dimensional stereo soundstage right in front of you.
Dual-Sided Output System and High-Output Mastery:
The Phonitor xe offers uncompromised connectivity, featuring dual premium output blocks mirrored on both the front and rear panels. This clean design allows you to route thick, heavy custom cables neatly out of the back for fixed desktop listening, while leaving the front panel completely open for quick monitoring switches.
Dual Output Architecture: Both sides carry a balanced 4-pin XLR connector alongside a standard 6.35mm (1/4") TRS jack.
Optimized Impedance Driving Power: Pushing massive wattages into low, mid, and high-impedance headphones, it controls demanding planar magnetic elements and high-impedance dynamic voice coils with absolute authority.
Laterality Balance Correction: Features a high-precision analog fine-tuning potentiometer to effortlessly compensate for subtle hearing variances or channel imbalances between left and right drivers.
120V VOLTAiR DC AUDIO PLATFORM: High-voltage operating rail network delivers vast headroom, lightning-fast transient speeds, and zero signal compression.
SINGULAR HEADPHONE DESIGN FOCUS: Purely optimized for headphone amplification with no preamplifier line-output circuits to corrupt the signal.
ANALOG PHONITOR MATRIX ENGINE: Recreates genuine loudspeaker-style stereo imaging and soundstage placement across headphones via adjustable Crossfeed and Angle arrays.
FRONT AND REAR HEADPHONE HOOKUPS: Features mirrored balanced 4-pin XLR and standard 1/4" TRS ports on both the front and rear panels for clean cable management.
MASSIVE POWER DELIVERY STAGE: Effortlessly drives ultra-demanding planar magnetics and high-impedance dynamic monitors to peak efficiency.
MOTORIZED ALPS "BIG BLUE" POT: Massive 45mm weighted aluminum volume dial driven by a premium automated ALPS fader with an integrated red indicator LED.
IR REMOTE CODE PAIRING: Smart infrared controller chip quickly programs to adjust room volumes from your favorite third-party remote.
RETRO AMBER VU METERS: Twin vintage mechanical meters track incoming signal levels gracefully, offering classic studio aesthetics.
SHIELDED TOROIDAL LINEAR SUPPLY: Employs an internal linear power block with a heavily shielded custom transformer to prevent magnetic hum.
HIGH/LOW GAIN SWITCH OPTION: Accessible toggle tailoring the output voltage to comfortably match high-efficiency in-ear monitors or heavy over-ear models.
| Feature | Specification |
| Device Type | Nonplusultra Reference Standalone Headphone Amplifier |
| Core Architecture | Proprietary 120V VOLTAiR Rail Technology (+/-60V DC Analog Operating Rails) |
| Analog Input Channels | XLR (Balanced) and RCA (Unbalanced) |
| Maximum Input Gain Level | 32.5 dBu |
| Input Impedance (RCA) | 20 kΩ |
| Input Impedance (XLR) | 20 kΩ |
| Frequency Range (0 dBu) | 10 Hz – 100 kHz |
| Crosstalk (1 kHz, 0 dBu) | -90 dB |
| THD + N (1 kHz, 0 dBu) | 0.00085 % |
| Noise Floor (A-weighted) | -103 dBu |
| Dynamic Range | 135.5 dB |
| Headphone Ports Layout | Dual Front and Rear Blocks: Balanced 4-Pin XLR & Standard 6.35mm (1/4") TRS |
| Source Impedance (Balanced Output) | 0.36 Ω |
| Damping Factor (Balanced, 40 Ω) | 180 |
| Output Power (Balanced, 250 Ω) | 2 x 3.5 W (1 kHz, 1% THD) |
| Output Power (Balanced, 32 Ω) | 2 x 0.7 W (1 kHz, 1% THD) |
| Source Impedance (Standard Output) | 0.18 Ω |
| Damping Factor (Standard, 40 Ω) | 180 |
| Output Power (Standard, 250 Ω) | 2 x 5 W (1 kHz, 1% THD) |
| Output Power (Standard, 32 Ω) | 2 x 1 W (1 kHz, 1% THD) |
| Power Supply Infrastructure | Internal Linear Power Supply with Shielded Toroidal Transformer |
| Operating Voltage (Analog Audio) | +/- 60 V |
| Operating Voltage (Relays & LEDs) | +12 V |
| Mains Power Voltage Engine | Selectable via fuse chamber: 230 V AC / 50 Hz; 115 V AC / 60 Hz |
| Fuse Layout Requirements | T 0.5 A (for 230 V) / T 1 A (for 115 V) |
| Power Consumption Parameters | Max. 40 VA |
| Stand-by Power Consumption | < 0.3 W |
| Dimensions (W x H x D) | 278 x 100 x 300 mm (11 x 4 x 11.81 inches, width x height incl. feet x depth) |
| Unit Weight | 4.4 kg (9.7 lbs) |
| Shipping Weight (Boxed) | 5.65 kg (12.46 lbs) |
| Reference Parameter Target | 0 dBu = 0.775V (All specifications are subject to change without notice) |
1 x SPL AUDIO Phonitor xe Nonplusultra Headphone Amplifier Main Unit
1 x Standard AC Grounded IEC Power Cable
1 x Set of Premium Vibration-Isolating Chassis Feet
1 x Official SPL Fidelity Series Operation, IR Remote Syncing, and Matrix Setup Manual
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