Topping's A30 is a small headphone amplifier / preamplifier that will delight headphone users. With two headphone outputs with different impedances, adjustable gain and a various power profiles (high / low / off) it can work with numerous types of headphones.

 Its amplification stage is based on OPA1611 and OPA2134. The latter can be changed thanks to a removable support that will allows the user to test different sounds restitution while enjoying a precise, clear sound with a large sound stage.

Linear power supply

In order to effectively isolate the audio signal from the intrinsic noise of an electrical appliance working, the A30 is equipped with a separate linear power supply.
The mains transformer delivers 2x15V devoted solely to the audio portion, while another secondary output provides 1x8V to all other components that do not directly affect the sound output: LEDs, some logic circuits, relays .. . This approach allows to use only one cable while separating the noise sources from the sound in the circuit. Outsourcing the linear transformer also keeps the transformer physically distant from the amplifiers to avoid magnetic leakage from causing interference. This approach also contributes to the management of thermal issues.

The A30 uses WIMA capacitors for coupling. These components allow to refine the overall performance of the device.

The A30 has been thoroughly reviewed by Audio Science Review.

You can find the whole analysis by clicking here.