SPL Phonitor One d 1902
SPL Phonitor One d 1902 - Headphone Monitoring Amplifier with 32 bit Converter
The SPL headphone amplifier Phonitor One allows high-quality monitoring of analog sources. Thanks to the Phonitor Matrix with Crossfeed control, you can create mixes that sound as if they were mixed on speakers. An analog volume controller, an aluminum front panel and a high-end metal housing show that no compromises have been made in terms of quality. The Phonitor One d also features an internal DA converter with top specifications. PCM signals up to 768 kHz/32Bit and Direct Stream Digital up to DSD4 playback leave nothing to be desired. A balanced stereo line output predestines the Phonitor One d to use it as a stand-alone DAC.
The Design Of The Amplification Stages The Preamplifier Stage
Two Burr-Brown OPA 2134 SoundPlus™ operational amplifiers provide the pre-amplification. These are specially designed for audiophile circuits and are characterized by extremely low noise and minimal distortion of only 0.00008%. Thanks to a true FET stage, the OPA 2134 achieves a slew rate of 20V/µs, making it a high-speed operational amplifier. This has an immediate positive effect on the liveliness of the playback. In addition, low capacitance film capacitors are installed in the signal path as bypass capacitors of the coupling
The Power Ampe
The output stage of the headphone amplifier is designed as a push-pull amplifier in class AB mode. The output stage transistors are thermally coupled and thus run particularly coherently, which contributes to a consistent and stable sound image. The power supply has a buffer circuit with low source resistance, ensuring generous current reserves even when operating low-impedance headphones.
Three Stereo Inputs
Two analog stereo sources and one digital source can be connected to Phonitor One d. The computer, tablet or phone are preferably connected via USB.
Other players such as a CD player, mixer, synthesizer or an analog tape machine / tape deck can be connected to the analog line inputs either balanced (TRS jacks) or unbalanced (RCA).
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.
It supports 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 qualifies the Phonitor One d for the currently highest resolution audio playback.
The USB connection is Class Compliant. This means 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.
The revolution in the headphone amplifier is the Phonitor Matrix – mixes made on headphones sound as they were mixed 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°. These 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 fully variable.
When the Crossfeed control is in the OFF-position the Phonitor Matrix is switched off – it is removed out off the audio signal path via relay (hysteresis circuit).
|Home Audio Features||Active Amplification, DAC|
|Number of Channels||2|
|Audio Inputs||Stereo L/R RCA, TRS/Audio Jack, USB|
|Audio Outputs||Headphone Jack|
|Number of L/R RCA Inputs||1|
|Number of Digital RCA Inputs||0|