The Audio-GD A-2 is a Class A headphone amplifier and preamplifier combo that takes advantage of totally discrete analog stages to offer a high quality sound reproduction that is as neutral as possible. No AOP or coupling capacitor is used on the signal circuit. The output stage embeds 2 pairs of paired transistors of 20W each. On the connection side, we find stereo RCA and ACSS (Non-Feedback) on the input side as well as stereo RCA (Pre-Out) and a 6.35mm jack (headphone output) on the output side. The pure Class A headphone amplification stage allows to deliver a consequent power of 2500mW under 25Ω, to accompany all types of headphones.

The volume control on the front panel is entrusted to an ALPS 27 potentiometer. A switch allows the gain level to be adjusted to 14dB or 20dB, making the A-2 capable of adapting to high or low sensitivity headphones as well. Jumpers inside the unit allow you to adapt the sound signature of the A-2 according to your tastes.

Versatile

The DACs have variable output impedances, depending on the model. To avoid a negative effect on sound quality, the A-2 has a pair of Diamond buffers at the input. All signals from the RCA inputs pass through these to achieve a very low output impedance, regardless of whether the source has a low or high output impedance. These buffers operate in pure Class A on a very short circuit in order not to induce sound coloration.