Topping NX2 Portable Headphone Amplifier Teardown

Topping NX2
Topping NX2

Time for another headphone amplifier! This is the Topping NX2, the upgrade from the NX1 I previously posted about. This one has a built in Burr Brown Audio DAC, along with the analogue audio input.

Audio I/O
Audio I/O

The front of the unit has the audio connections, power switch & volume control wheel. Standard 3.5mm TRS jacks are used.

USB I/O
USB I/O

The other end holds a pair of USB Micro B connectors – one for charging the internal lithium cell, and the other providing a data interface for the internal DAC. A charge indicator LED is provided next to the charging port.

Main PCB
Main PCB

The PCB slides out of the casing, revealing a nice compact layout. The biggest item here is the lithium cell, providing all power to the unit.

Chipset
Chipset

Audio amplification is handled by a Texas Instruments TP9260 Current-Feedback Class AB amplifier IC, with the USB Audio DAC being a Burr-Brown PCM2704. Nice Wima film capacitors are used on the input stage, although this amplifier suffers from a total lack of bass response – all low frequencies seem to get cut.

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