The XM4 delivers crystal-clean sound quality, packed with a combination of useful features not found on other amps. The robust anodized aluminum case and glossy laser-anodized faceplate combine to make the XM4 an striking sight to behold. The impressive engineering continues on the inside, where such...

The XM5 is the most feature-packed portable headphone amplifier on the market today. Strong, clean, unsurpassed sound quality is made possible by the XM5's two-chip ultra-low-distortion FET amplification stage, mated to a separate two-chip output buffering stage, all in a monoblock configuration. All...