SPL Phonitor One - Headphone Amplifier

Analog inputs; 6.35 mm (1/4") TRS Jack (balanced), 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

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 dBu

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

+12 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

1,40 kg

3,09 lbs

Shipping weight (incl. packaging)

2 kg

4,4 lbs

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, 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.

Two Line Inputs

Two analog stereo inputs can be connected to Phonitor One. 

Sources such as a DA-converter, 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).

If you want to connect your computer, tablet or phone directly, check out Phonitor One d with USB input and a state-of-the-art 32-bit DA-converter.

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 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 into operation.