SPL Phonitor One d Headphone Amplifier with 32-bit DAC (Black)

Description

Phonitor One d

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.

Specifications

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.