Audio
Signal-to-Noise Ratio (SNR)	110 dB
Audio D/A Converter (DAC)	32-bit/384kHz
Adjustable volume
Ports & interfaces
Headphone connectivity	3.5mm
S/PDIF out port
Power
Power source	USB
System requirements
Mac operating systems supported	Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion, Mac OS X 10.8 Mountain Lion, Mac OS X 10.9 Mavericks, Mac OS X 11.0 Big Sur
Technical data
Height packaging	0.072m
Article width	8.00cm
Output (1)	Combined 3.5mm stereo audio line OUT and optical S/PDIF digital output, 6.3mm & 3.5mm stereo phone jacks
Interface	USB input, Type B
Colour	Silver
Weight	0.772kg
Signal transmission	Wired
Net weight	0.285kg
Control	1x volume
Packaging volume	0.0018m³
Article height	8.00cm
Special feature	With tube
System requirements	Windows 11, 10, 8.1, 8, 7, Vista, XP 32/64-bit and MAC OS X (10.6 or above), works with Apple (with camera kit) and Android portable devices (with OTG adapter). Compatible Apps with DSD audio playback are available in the app stores and possibly connected with full functionality with additional costs (in-app purchases, such as App "Onkyo HF Player")
Type	USB Audio DAC with Vacuum Tube amplifier
Input	USB B female
Length packaging	0.172m
Article length	10.80cm
Width packaging	0.142m
Hi-Res
Bluetooth
Technical details
Product colour	Silver
Package volume	1800 cm³
Weight & dimensions
Width	80 mm
Depth	108 mm
Height	80 mm
Weight	285 g
Package weight	772 g
Package depth	172 mm
Package width	142 mm
Package height	72 mm

High-resolution sound: Supports 384kHz/32bit PCM and DSD128 for detailed, low-loss audio playback at hi-fi level.
Natural tube sound: The integrated 12AU7 tube provides a warm, harmonious sound character with analog signal amplification.
Multiple connection options: 3.5mm and 6.3mm jacks, line-out and optical S/PDIF allow flexible connection to headphones or audio systems.
Asynchronous USB transmission: Avoids jitter and ensures stable signal processing - ideal for enjoying music on a PC or notebook.
High-quality workmanship: Robust aluminum housing, analog volume control and LED display for PCM/DSD make the DAC a premium audio device.
The InLine AmpUSB combines a high-quality USB DAC and tube headphone amplifier in one compact device - perfect for anyone who wants to get more out of their music. Whether on a PC, notebook or with mobile devices (via OTG adapter): The amplifier delivers detailed and natural audio reproduction at hi-fi level. High-resolution formats such as 384kHz/32bit PCM and DSD128 (DoP and native) are supported.
The integrated 12AU7 tube ensures a warm, soft sound character. The asynchronous USB transfer mode keeps the signal stable and free from interference. The built-in Cirrus Logic CS4392 DAC ensures precise conversion and delivers an SNR of approx. 110 dB.
Whether with 3.5 mm or 6.3 mm headphones, line-out or optical S/PDIF output: the AmpUSB adapts flexibly to your audio environment. It supports impedances from 16 to 600 ohms and is therefore also ideally suited for demanding headphones. An analog volume control and LEDs for displaying PCM and DSD signals round off the concept.
The high-quality metal housing ensures a durable and stylish look. Windows, macOS and Android systems are supported. Ideal for anyone who wants to experience music rather than just listen to it.
Playback formats: PCM up to 384kHz/32bit, DSD128
Compatibility: Windows XP to 10, macOS from 10.6, Android (OTG)
Output power: 210 mW / 16 Ohm, 190 mW / 32 Ohm
Headphone impedance: 16-600 Ohm
Ports: 3.5mm & 6.3mm jack, line-out, optical S/PDIF
Case material: aluminum
Dimensions: 11cm x 8.1cm x 8cm