(Open Box) SPL - 'Phonitor One d' Audiophile Headphone Amplifier & DAC (Black)
(Open Box) SPL - 'Phonitor One d' Audiophile Headphone Amplifier & DAC, USB Class-Compliant, High-Speed Op-Amps (Black)
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Audiophile Headphone Amplifier & DAC
SPL - Phonitor One d
(Black)
The Audiophile Headphone AmplifierThe SPL Phonitor One d is an Audiophile Headphone Amplifier which features innovative Phonitor Matrix, 32-bit DA-converter and incredible sound quality. Made from components which allow you to experience top of the range monitoring accuracy. With a no compromise design and specification set, the SPL Phonitor One d makes for a great introduction to the Phonitor world.
Providing true headphone monitoring accuracy, the Phonitor One d is a sleek and user-friendly interface that does its job incredibly well. Carefully crafted in Germany using audiophile-grade components and outstanding build quality, you get flawless operation and an elegant aesthetic that will fit right into your home or recording studio. Including a premium AK4490 converter chip, you get two analogue inputs, and a USB digital input whilst compatible with PC, Mac and iOS connectivity, making the Phonitor One d a versatile and reliable addition to your set up.
At A Glance
• Phonitor Matrix with Speaker Angle, Center Level, and Crossfeed parameters for speaker-like monitoring
• Low-capacitance film capacitors in signal path offer accurate transmission of HF signal components
• Front-panel-selectable stereo inputs: 2 analogue (balanced 1/4-inch TRS, RCA); 1 digital (USB)
• USB class-compliant for plug-and-play connectivity to Mac computers and iOS devices
• Preamplification FET stage: 2 Burr-Brown OPA 2134 SoundPlus high-speed op-amps
The Design Of The Amplification Stages
The Preamplifier Stage
Two Burr-Brown OPA 2134 SoundPlus™ operational amplifiers deliver the pre-amplification, specially designed for audiophile circuits feature incredibly low noise and minimal distortion of only 0.00008%. A true FET stage allows the OPA 2134 to achieve a slew rate of 20V/µs, making it a high-speed operational amplifier. Providing an immediate positive effect on the liveliness of the playback.
Low capacitance film capacitors are also installed in the signal path as bypass capacitors of the coupling capacitors, offering a more accurate transmission of the high-frequency signal components. The excellent Panasonic ‘Electric Double Layer’ gold electrolytic capacitors are used as coupling capacitors. They offer the highest storage capacity of all capacitor technologies.
The Power Amplifier
The output stage of the headphone amplifier is created as a push-pull amplifier in class AB mode. The bipolar transistors share the amplification of the positive and negative half-waves, which generates a higher gain and a higher output voltage than in Class A operation, where only one transistor amplifies both half-waves.
The output stage transistors are thermally coupled and run particularly coherently, this contributes to a stable and reliable sound image. The power supply has a buffer circuit with low source resistance, offering generous current reserves even when operating low-impedance headphones.
The Revolution
The Phonitor Matrix is found in the headphone amplifier, with adjustable crossfeed, you can create mixes with headphones that sound the same on speakers. The Phonitor Matrix in its largest expansion stage has three setting parameters: Crossfeed, Speaker Angle and Center Level. In the Phonitor One d, the center level is preset to -1 dB and the speaker angle to 30°. Which are the most commonly used values.
The crossfeed function determines the crosstalk of the channels, the so-called interaural level difference. The intensity of the crossfeed is completely variable. At the start of the control path the function is not in the audio path. It is only switched on by adding it using relay (hysteresis circuit). The audio signal therefore does not pass through the crossfeed stage if this is not wanted.
Flexible Connectivity
Three Stereo Inputs
Two analogue stereo inputs and one digital USB input can be connected to Phonitor One d. The computer, tablet or phone are preferably connected by USB.
Other players like a CD player, mixer, synthesizer or an analog tape machine / tape deck can be connected to the analogue line inputs either balanced (TRS jacks) or unbalanced (RCA).
32-Bit DA-Converter
The converter chip used is the Premium AK4490, a new generation of premium 32-bit DACs equipped with AKM’s Velvet Sound®. This technology makes the finest details audible thanks to its low-distortion architecture. Supporting sampling frequencies up to 768kHz PCM (16x CD resolution) and DSD (Direct Stream Digital) playback up to DSD4 or DSD256 (11.2 MHz) resolution. This uses the Phonitor One d for the currently highest resolution audio playback.
The USB connection is Class Compliant, meaning that all Mac computers and iOS devices like iPads and iPhones can use the full performance bandwidth of the DA-converter without driver installation. iOS devices require the camera adapter. For Windows a driver is required, which you can download online.
Line Out
The selected input signal is output unchanged at the line out, allowing Phonitor One d to be looped between devices without “losing” an output connection. For example, if several people are to listen in using headphones, a headphone amplifier can easily be connected to the Line Out.
You can also record the signal analog or send it to a mixer for further processing. The Phonitor One d can also be used as a state-of-the-art DA-converter, which recommends it for a series of other tasks.
The Power Supply
Good sound always begins with the power supply. This is where you lay the foundation for the performance of the whole device. Although we “only” supply a 12 V plug-in power supply unit, the secondary power supply inside generates a voltage level of +/-17 Volts for the analogue audio sections with which professional levels of up to +22.5 dB are possible.
An elaborate low-drop operating voltage regulation provides more “juice” and regulates cleanly even when the maximum operation voltage is reached. The Phonitor One d offers full power when used with the included 1.5 A power supply. Only use the 12 V plug-in power supply unit within the scope of delivery. The ON-switch puts the Phonitor One d into operation.
The Phonitor Matrix Parameters
CrossfeedLevel and frequency adjustment of the right (red) and left (green) audio channel at maximum crossfeed.
AngleSettings for the speaker placement angle to determine the interaural time difference.
Conventional
Phonitor Matrix
Correct
Phonitor One d – Overview
The Tech Spec
| Features | Specification | Analogue inputs & outputs; 6.35 mm (1/4") TRS Jack, RCA | Input gain (max.): +22.5 dBu Input impedance Line In 2 (balanced): 20 kΩ Common mode rejection: < 60 dB Input impedance Line In 1 (unbalanced): 47 kΩ Output gain (max.): +22 dBu Output impedance Line Out (balanced): 150 Ω Frequency range (-3dB): 10 Hz - 200 kHz Noise (A-weighted, 0 dBu, 600 Ω load): - 99 dB THD + N (0 dBu, 10 Hz – 22 kHz, 600 Ω): 0.002 % THD + N (0 dBu, 10 Hz – 22 kHz, 32 Ω): 0.013 % Crosstalk (1 kHz): < 75 dB Dynamic range: 121.5 dB |
|---|---|
| USB, 32-Bit DA | USB (B), PCM sample rates: 44.1/48/88.2/96/176.4/192/352.8/384/705.6/768 kHz kHz USB (B), DSD over PCM (DoP), sample rates: 2.8 (DSD64), 5.6 (DSD128), 11.2 (DSD256) MHz MHz 0 dBFS calibrated to: 15 dBu Noise (A-weighted, 44.1/48 kHz sample rate): -113 dBFS THD + N (-1 dBFS, 10 Hz – 22 kHz): 0.0012 % Dynamic range (44,1/48 kHz sample rate): 113 dBFS |
| Headphones Output; 6.35 mm (1/4") TRS Jack | Wiring: Tip = Left, Ring = Right, Sleeve = GND Source impedance: 20 Ω Frequency range (-3 dB): 10 Hz - 200 kHz Noise (A-weighted, 600 Ω): -97 dB THD + N (0 dBu, 10 Hz – 22 kHz, 600 Ω): 0.002 % THD + N (0 dBu, 10 Hz – 22 kHz, 32 Ω): 0.013 % Max output power (600 Ω): 2 x 190 mW Max output power (250 Ω): 2 x 330 mW Max output power (47 Ω): 2 x 400 mW Fade-out attenuation (600 Ω): -99 dB Crosstalk (1 kHz, 600 Ω): -75 dB |
| Internal Power Supply | Operating voltage for analogue audio: +/- 17 V Operating voltage for headphone amplifier: +/- 19 V Operating voltage for relays and LEDs: +12 V Operating voltage for digital audio: +3,3 V, +5 V |
| External Power Supply | AC/DC switching adaptor: Mean Well GE18/12-SC DC plug: (+) pin 2.1mm; (-) outside ring 5.5mm Input: 100 - 240 V AC; 50 - 60 Hz; 0.7 A Output: 12 V DC; 1.5 A |
| Dimensions (W x H x D) | 210 x 49,6 x 220 mm 8,23 x 1,95 x 8,66 inch |
