SPL Phonitor One D (Black)

Headphone Amplifier

 625,00 ( 512,30 + VAT)


Shipped in 4 - 8 Days.

- +
Finance from 20,15 / month
Low Rate Financing
(Tan 9,94% - Taeg 12,37%)
More info


  • Two Burr-Brown OPA 2134 SoundPlus™ operational amplifiers
  • Panasonic ‘Electric Double Layer’ gold electrolytic capacitors
  • output stage of the headphone amplifier is designed as a push-pull amplifier in class AB mode
  • In the headphone amplifier is the Phonitor Matrix, with adjustable crossfeed
  • Two analog stereo inputs and one digital USB input can be connected
  • A new generation of premium 32-bit DACs equipped with AKM’s Velvet Sound®
Featured Videos
  • Free Shipping
  • After Sale Support
  • 2 Years Warranty
  • Secure Payments

SPL Phonitor One D (Black)

Headphone Amplifier

The Audiophile Headphone Amplifier

with innovative Phonitor Matrix, 32-bit DA-converter and outstanding sound quality

number one in sound

For us the sound is always in the foreground. When it sounds good, we like to listen. To get such a sound, you need experience and technical finesse. We have incorporated both into the Series One.

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 capacitors, which ensures a more precise 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 designed as a push-pull amplifier in class AB mode. The bipolar transistors share the amplification of the positive and negative half-waves, which produces 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 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.

The Revolution​

In the headphone amplifier is the Phonitor Matrix, with adjustable crossfeed, thanks to which 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°. 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.

At the beginning of the control path the function is not in the audio path. It is only switched on by adding it via relay (hysteresis circuit). The audio signal therefore does not pass through the crossfeed stage if this is not desired.

Three Stereo Inputs

Two analog stereo inputs and one digital USB input 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).

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.

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, which you can download at the bottom of this page.

Line Out

The selected input signal is output unchanged at the line out. This allows Phonitor One d to be looped between devices without “losing” an output connection.

If, for example, several people are to listen in via headphones, a headphone amplifier can simply be connected to the Line Out.

But you can also record the signal analog or send it to a mixer for further processing.

Thus, 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 starts with the power supply. This is where you lay the foundation for the performance of the entire 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 analog audio sections with which professional levels of up to +22.5 dB can be achieved!

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 delivers 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.


Analog 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 AD/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 analog 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 & Weight

  • W x H x D (width x height incl. feet x depth):
    210 x 49,6 x 220 mm
    8,23 x 1,95 x 8,66 inch
  • Unit weight:
    1,45 kg
    3,2 lbs
  • Shipping weight (incl. packaging):
    2 kg
    4,4 lbs

Reference: 0 dBu = 0,775V. All specifications are subject to change without notice.


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

Return and restocking option is available for private customers only. We will issue a refund/credit if you are not satisfied with your purchase and notify us within 10 days of product receipt. It must be returned in the original packaging and in saleable condition and must be returned freight prepaid. Return and restocking rights are not applicable for Audio/Video and software products. Shipping and handling charges to and from are not refundable.

Find out more in our departments

Start typing and press Enter to search

Shopping Cart