SPL Audio Phonitor One
469€
- Headphone amplifier
- with phonitor matrix
- 2 analog inputs
- Burr-Brown OPA 2134 SoundPlus™ operational amplifier
The Phonitor One from SPL is a headphone amplifier with two analog inputs. Input 1 has RCA jacks and is therefore unbalanced while input 2 is a balanced jack (TRS).
A 12V power supply with 1.5A supplies the excellent amplifier with power. In the secondary power supply, the voltage is up-transformed to +/-17V and can accordingly operate at a professional level of up to +22.5dB. A low-drop operating voltage control ensures clean signals even when the maximum voltage is reached.
The special feature of the Phonitor One is that the innovative Phonitor Matrix is built in. Here, with the help of a crossfeed, a sound image can be created that is very close to that of speakers.
In the largest version, the parameters Crossfeed, Speaker Angle and Center Level are available. In the Phonitor One, the most commonly used setting of -1dB center level and 30° speaker angle is preset. The continuously adjustable Crossfeed creates a crosstalk between the two channels (interaural level difference). When the crossfeed is set to “Off”, the signal does not pass through the hysteresis circuit implemented by relay.
Analog inputs (6.35mm stereo jacks + RCA jacks)
- Maximum input level: +22.5dBu
- Input impedance (Line 1, unbalanced): 47kΩ
- Input impedance (Line 2, balanced): 20kΩ
- Common mode rejection: <60dB
Headphone output (6.35mm stereo jack)
- source impedance: 20Ω
- Frequency response (-3dB): 10Hz – 200kHz
- Crosstalk (1kHz, 600Ω): -75dB
- THD + N (0dBu, 10Hz – 22kHz, 32Ω): 0.013%
- THD + N (0dBu, 10Hz – 22kHz, 600Ω): 0.002%
- Noise (A-weighted): -99dBu
- Fade-out attenuation (600Ω): -99dB
- Max. Output power (600Ω): 2x 190mW
- Max. Output power (250Ω): 2x 330mV
- Max. Output power (47Ω): 2x 400mW
The Audiophile Headphone Amplifier
Designed specifically for audiophile circuits, the Burr-Brown OPA 2134 SoundPlus™ op-amps provide preamplification with extremely low noise and distortion of only 0.00008%. Using an FET stage, the op-amp achieves a slew rate of 20V/µs for liveliness and playing pleasure.
Low capacitance film capacitors are used as bypass capacitors to ensure precise transmission of the high frequency signal components.
The bipolar transistors, which are built into the output stage of the headphone amplifier, divide positive and negative half-waves during amplification. This allows a larger output voltage than with a transistor that amplifies both half-waves. Thermal coupling of the power amplifier transistors ensures a consistent sound image.
Conventional
Phonitor Matrix
Channel crosstalk
| Weight | 2 kg |
|---|---|
| Dimensions | 38 × 27 × 7,5 cm |
| Color | Black |
| Headphone Jack | Yes |
| Channels | Stereo |
| Port | Cinch, sym. Jack |
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Thomas R. (Verifizierter Käufer) –
wie erwartet