The Allnic HPA-15000 OTL/OCL is the company’s flagship headphone amplifier, developed to push the limits of vacuum tube headphone amplification through a completely transformer-less and capacitor-less output architecture. Building on the foundation of the acclaimed HPA-10000, the amplifier has been comprehensively redesigned to deliver exceptional transparency, low distortion, and uncompromised signal purity.

At the heart of the design is Allnic’s OTL/OCL topology, which removes both output transformers and coupling capacitors from the signal path. Combined with carefully selected vacuum tubes and a sophisticated multi-stage circuit, the HPA-15000 is engineered to provide exceptional clarity, dynamic expression, and natural musical reproduction across a wide variety of premium headphones.

The amplifier also incorporates Allnic’s flagship 61-step Constant Impedance Attenuator, balanced and unbalanced headphone outputs, and line-level preamplifier functionality. An optional direct ribbon headphone output for RAAL headphones further expands its capabilities, providing a dedicated connection pathway designed for maximum speed, openness, and high-frequency performance.