You actively opt for a dedicated headphone amplifier because, after all, it requires separate cabling from the source device. Conversely, you might say: If you invest money in high-quality headphones for stationary use and possibly even use them as a daily work tool, you would do well not to skimp on the amplifier. SPL’s Phonitor One masters its self-imposed task with a brilliant price-performance ratio. This applies to both the model presented here and the version with supplementary USB interface. As a special feature, the integrated Phonitor Matrix offers real added value in the assessment of sound signals designed for loudspeaker output, ultimately providing improved assurance of sound compatibility.