SPL Audio HPm – Dual Headphone Amplifier

SPL HPm Overview

The HPm Headphone Monitoring Amplifier from SPL has two headphone outputs. Each of the two headphone outputs is supplied by a separate amplifier, allowing two headphones to operate independently. The Phonitor Matrix allows you to adjust the crossfeed, speaker angle, and center level to get speaker-like listening and monitoring on headphones. Because the HPm’s input signals slave to the 500-series rack’s outputs, it is simple to connect it between the DAW and a monitor controller. The HPm’s features include phase inversion of the left or right channel, as well as a Stereo/Mono/Mute switch.

Features of SPL HPm Headphone Amplifier

•  A 500-series rack module housing a headphone monitoring amp with SPL Phonitor Matrix
•  Two headphone outputs with independent amplifier stages.
•  The Phonitor Matrix removes the super-stereo effect found in typical headphone amplifier designs.
•  Provides a speaker-like listening experience on headphones.
•  Adjust the crossfeed and speaker angle for equivalent sound quality between headphones and loudspeakers.
•  Use a center level to properly level phantom center signals while mixing on headphones.
•  Rack module with dual 500-series slots.
•  Made in Germany.

For audiophiles and sound professionals who demand pristine audio quality and precise control, the SPL Audio HPm Dual Headphone Amplifier offers an unparalleled listening experience. Whether you are mixing tracks in a studio environment or simply want to enjoy your favorite music with exceptional clarity, this amplifier is designed to elevate every detail of your sound. It not only amplifies your headphones but does so in a way that preserves the integrity of the original recording, making it an essential tool for critical listening.

Many headphone amplifiers on the market either add unwanted noise or distortion, compromising the accuracy of your audio. The SPL Audio HPm addresses these issues head-on by delivering a remarkably low total harmonic distortion (THD) of just 0.03% within the critical 10 Hz to 22 kHz range. This means that what you hear is an almost exact replica of the source, free from the muddiness and coloration that other amplifiers might introduce. Additionally, with a dynamic range of 113 dB, the amplifier can handle the quietest nuances and the loudest crescendos without loss of detail or clarity.

One of the standout features of the HPm is its high maximum input and output gain of 21 dBu. This translates to plenty of headroom, allowing you to connect a wide variety of audio sources and headphones, including those with higher impedance that typically require more power. The input impedance of 10 kΩ ensures that the amplifier does not load down your audio source, preserving its tonal characteristics and delivering a clean signal. On the output side, the 150 Ω impedance is optimized to drive professional headphones efficiently, ensuring consistent performance across different models.

The frequency response of the SPL Audio HPm ranges from 10 Hz to 100 kHz (-3 dB), exceeding the audible spectrum and guaranteeing that every harmonic and transient is faithfully reproduced. This broad frequency range is particularly beneficial for high-resolution audio files and professional applications where subtle sonic information matters. Moreover, the common mode rejection ratio of over 82 dB effectively minimizes interference and noise from external sources, further enhancing the purity of the audio signal.

For practical considerations, the dual headphone amplifier design allows two listeners to monitor the same source independently, making it ideal for collaborative work environments such as recording studios or broadcast settings. Despite its professional-grade specifications, the unit is thoughtfully engineered to fit comfortably into any desktop setup without occupying excessive space. Its robust build quality ensures durability, while the straightforward controls provide precise adjustments without unnecessary complexity.

Whether you are a sound engineer fine-tuning a mix or an audiophile seeking the ultimate headphone experience, the SPL Audio HPm Dual Headphone Amplifier delivers professional-grade performance at a competitive price point of ₹44,010. It is an investment in audio fidelity that brings every sonic detail to life, giving you confidence that what you hear is exactly what was recorded. With the HPm, you can trust that your headphones will be driven with the clarity, power, and precision your music deserves.