SPL Audio Phonitor x

Sale price$2,999.00

Color: Black
DAC: Yes

SPL Audio Phonitor x


Phonitor x

The headphone amplifier with preamplifier

Enjoy music over headphones and over speakers equally excellently with the superior VOLTAiR technology – that’s why we developed Phonitor x.

For all headphones

The Phonitor x offers connections for standard headphones with jack plug and for balanced headphones a 4-pin XLR connector.

Thanks to the enormous output power of 18 watts, all headphones are driven effortlessly.

Headphones or Speaker

The OUTPUT switch turns the headphone amplifier into a preamplifier – simply switch from headphones to speakers and the selected source signal goes to both analog audio outputs, RCA and XLR.

In the center position (mute), no signal reaches the outputs. The VU meters light up red.

To the power amplifiers

or to the active loudspeakers you can use the balanced XLR- for long, and the RCA sockets for short cable runs.

Practical are the AMP CTL sockets to which power amplifiers with 12V trigger inputs can be connected to switch them on and off together with Phonitor x.

“With the new DAC768xs module, the Phonitor x really shows its phenomenal qualities as a headphone amplifier and preamp, even with digital sources connected.”

Dr. Martin Mertens

Milled from solid

is the big 45mm Volume control. Its mass together with the  motorized Alps RK27 “Big Blue” potentiometer enhances the “spoon in the honey” feeling even further.

The red marker LED makes the setting visible even in darkened environments.

Volume RC

The volume can be remote controlled with any infrared remote control, that the Phonitor x simply learns.

To do this, press the IR programming button and then the buttons for louder and quieter.

Play Video

Learning made easy

This video explains how you can use any infrared remote control to remotely control the volume.


“The Phonitor x is one of the most extraordinary headphone amplifiers on the market ... with a meticulous level of detail and unrestrained musical playfulness. Period."

Holger Biermann
Low Beats

Source of joy

Up to six (6 !) stereo sources can be connected to Phonitor x:

XLR, RCA, USB, Coax, Optical and AES/EBU

Phonitor x accepts a large variety of audio connections. Balanced via XLR or unbalanced via RCA connectors.

With the optional DAC768xs, three additional digital sources can be added.

The DAC768xs

The highly acclaimed AKM AK4490 Velvet Sound™ premium DAC chip is used as the converter chip in the optional digital-to-analogue converter, which thanks to its new architecture reproduces the finest sound details.

It converts PCM audio with a resolution of 32 bits and a sampling rate of up to 768kHz, which is equivalent to 16 times CD resolution. Direct Stream Digital is also supported up to a resolution of DSD4 or DSD256.

“I am sufficiently enamored with the Phonitor x that I have decided to buy one; which is the highest recommendation I can give any component.”

Ian Dunmore

Good ol' times

Two mechanical VU meters visualize the input levels for the left and right audio channel.

Finding the middle

is not always easy. By our very nature, hearing can be leaning more to the left or more to the right. This is especially obvious when listening with headphones.

That’s why Phonitor x has the uniquely finely resolved laterality control. With it, the center can be found perfectly.

With the mode switch you can choose between stereo or mono playback. To the right, the laterality control is switched on.

“In a word: awesome."

"The Phonitor x always delivered a spotless, honest and tremendously dynamic sound."

Freda Ressel
Professional Audio & Mobile Fidelity

The Revolution

in the headphone amplifier is the Phonitor Matrix, thanks to which you can listen to music through headphones as if you were listening through speakers. The tiring super stereo effect is a thing of the past.

Enjoy your music exactly the way it should be heard. 


Phonitor Matrix


The Phonitor Matrix Parameters


Level and frequency adjustment of the right (red) and left (green) audio channel at maximum crossfeed.



Settings for the speaker placement angle to determine the interaural time difference.


Play Video

Everything you need to know about the Phonitor Matrix
Play Video

Everything you need to hear about the Phonitor Matrix

Video Review – Gaming Audio Guide

"This device is a technological tour de force.”

“As a headphone amplifier, the SPL Phonitor x is the best I have ever heard.”

Jon Thompson
Home Cinema Choice

The VOLTAiR Technology

What exactly is that?

And what does it do?

Good questions need good answers. And that’s what the 120V video gives you.

Play Video

VOLTAiR is that good

In the lab, we pitted Phonitor xe against the best audio measurement system and found that Audio Precision could not measure VOLTAiR technology.
Play Video

Play Video
This video guides you step by step through Phonitor x.

Play Video
And in this video we introduce you to the entire Professional Fidelity Series.​


Part-Time Audiophile
Ear In
Haute Fidélité

Play Video
Replacement of defective fuses for 115V
Play Video
Replacement of defective fuses for 230V
Play Video
Changing the mains voltage from 115V to 230V
Play Video
Changing the mains voltage from 230V to 115V


Analog inputs & outputs: XLR (balanced) and RCA

Maximum input & output gain
32.5 dBu
Input impedance (RCA)
Input impedance (XLR)
Output impedance
75 Ω
Common mode rejection (XLR)
82 dB
Frequency range (-3dB)
4 Hz – 300 kHz
THD + N (10 Hz – 22 kHz, 0 dBu)
0.00085 %
Noise (A-weighted)
-103.8 dBu
Crosstalk (1 kHz)
-106 dB
Dynamic range
136.3 dB

Digital Inputs: DAC768xs (optional)

Coaxial SPDIF (RCA), PCM sample rates
44.1/48/88.2/96/176.4/192 kHz
Optical SPDIF (Toslink F06), PCM sample rates
44.1/48/88.2/96/with Glass fibre <1m: 176.4/192 kHz
USB (B), PCM sample rates
44.1/48/88.2/96/176.4/192/352.8/384/705.6/768 kHz
USB (B), DSD over PCM (DoP), sample rates
2.8 (DSD64), 5.6 (DSD128), 11.2 (DSD256) MHz
0 dBFS calibrated to
8 dBu

Balanced Headphones Output: 4-pol XLR

Pin wiring
1 = L (+), 2 = L (-), 3 = R (+), 4 = R (-)
Source impedance
0,36 Ω
Damping factor (40 ohms)
Frequency range (-3dB)
10 Hz – 300 kHz
Crosstalk (1 kHz)
-90 dB
THD + N (0 dBu, 10 Hz – 22 kHz)
0.00091 %
Noise (A-weighted)
-98 dBu
Output power (1 kHz, 1% THD, 600 Ω)
2 x 8 W
Output power (1 kHz, 1% THD, 300 Ω)
2 x 3.5 W
Output power (1 kHz, 1% THD, 32 Ω)
2 x 0.7 W
Dynamic range
130.5 dB

Standard Headphones Output: 6.35 mm (1/4") TRS Jack

Tip = Left, Ring = Right, Sleeve = GND
Source impedance
0.18 Ω
Damping factor (40 ohms)
Frequency range (-3dB)
10 Hz – 300 kHz
Crosstalk (1 kHz)
-90 dB
THD + N (0 dBu, 10 Hz – 22 kHz)
0.00091 %
Noise (A-weighted)
-103 dBu
Output power (1 kHz, 1% THD, 600 Ω)
2 x 2.7 W
Output power (1 kHz, 1% THD, 300 Ω)
2 x 5 W
Output power (1 kHz, 1% THD, 32 Ω)
2 x 1 W
Dynamic range
135.5 dB

Internal Linear Power Supply with Shielded Toroidal Transformer

Operating voltage for analog audio
+/- 60 V
Operating voltage for relays and LEDs
+12 V
Operating voltage for optional DAC768xs
+5 V, +3.3 V

Mains Power Supply

Mains voltage (selectable, see fuse chamber)
230 V AC / 50; 115 V AC / 60 Hz
Fuse for 230 V
T 500 mA
Fuse for 115 V
T 1 A
Power consumption
max. 40 VA
Stand-by power consumption
< 0,3 W

Dimensions & Weight

W x H x D (width x height incl. feet x depth)
278 x 100 x 300 mm

11 x 4 x 11.81 inch
Unit weight
4.4 kg

9.7 lbs
Shipping weight (incl. packaging)
5.65 kg

12.46 lbs

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

Slimmer is smarter

The Drivers

Mac OS & iOS

No driver installation required for Mac or iOS devices (class compliant).

iOS devices must be connected using the Apple camera adapter.



To operate with a higher than the standard sample rate this driver installation is required.


Windows 7/8/8.1/10 up to 2009/20H2
(32/64 bit)

Legacy Driver

Windows 7/8/8.1/10 up to 2004/VB
(32/64 bit)

Driver for DAC192 (Art.-No. 1670)

Mac OS & iOS

No driver installation required for Mac or iOS devices (class compliant).

iOS devices must be connected using the Apple camera adapter.


SPL DAC driver for audio playback with sample rates higher than 48kHz.

Windows 7/8/10