The iFi Audio ZEN CAN Signature 6XX is a specialized headphone amplifier designed specifically for high-impedance headphones, particularly optimized for use with the Massdrop x Sennheiser HD 6XX model. This dedicated amplifier delivers precise power matching to drive demanding headphones with exceptional clarity and control. Featuring a fully balanced analog circuitry design, it provides clean amplification with minimal distortion across the entire frequency spectrum. The amplifier incorporates iFi Audio's proprietary technologies, including fully discrete amplification stages and precision volume control. It offers multiple connectivity options with both single-ended and balanced inputs and outputs, accommodating various audio sources and headphone configurations.

The unit features a robust aluminum chassis measuring approximately 158 mm wide, 72 mm deep, and 35 mm high, with a weight of approximately 450 g. Power is supplied via a dedicated external power supply unit, ensuring stable operation and eliminating potential noise from computer USB ports. The front panel includes a precision analog volume knob, power indicator, and multiple headphone output jacks, including 6.3 mm single-ended and 4.4 mm balanced connections. The rear panel provides RCA and 3.5 mm analog inputs along with power input.

The amplifier operates with a frequency response of 10 Hz to 100 kHz and delivers up to 1600 mW of power at 32 ohms, ensuring ample headroom for dynamic peaks. Thermal management is handled through the aluminum enclosure, which serves as an effective heat sink. The ZEN CAN Signature 6XX is engineered for audiophiles seeking optimized performance with specific high-impedance headphone models, providing transparent amplification that preserves the original audio signal integrity while delivering the necessary current and voltage for proper driver control.