Based on the analysis of vacuum tube slight variation equivalent circuit, a headphone amplifier is designed to drive high fidelity headphone.

以电子管微变等效电路分析为基础，设计了一款以驱动高保真耳机为目的的耳机放大器。

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Sound headphone also requires a quality amplifier just like a top - grade loudspeaker.

靓声的耳机就如同高级的喇叭，同样需要高素质的放大器来伺候。

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Nuforce also offers devices such as the Icon 2 integrated power amplifier for desktop users, and the USB-powered Icon U-Dac 2 headphone amplifier for laptop users.

FORBES: How Nuforce is Reinventing High-End Audio for the Digital Age

After recently having presented its first digital headphone amplifier, the audio specialist Sennheiser announces at IFA 2012 that it will also launch an analogue version of the device, available in the U.S. later this fall.

ENGADGET: Sennheiser unveils HDVA 600 analog headphone amp, asks for $1,600

Studio-grade components, which include external digital-to-analog converters (DACs) that deliver 127dB signal-to-noise ratio (SNR), sockets for swappable Op-Amps, a high-end 80mW into 600 ohm headphone amplifier, and 192kHz pass through, are used to deliver phenomenal audio quality.

ENGADGET: Creative reveals Sound Blaster ZxR, Zx, and Z PCI-Express sound cards, pumps up the volume