Linear USB II

From £1700.00
Special Order
  • High resolution USB audio input
  • Auto-detecting input system prioritises USB audio
  • Premium construction and luxury electrical components used


How To Buy

As UK distributors for the brands we represent, our main focus is to give you all the information you need to help assist with your purchase. Once you have the information you need, we want to make the purchase process as simple as possible. So we give you up-to three options on how to buy our products.

Find Your Local Retailer

Our preferred option is for you to visit a nearby store and buy what you need locally. Our authorised stockists are some of the finest specialist hi-fi retailers in the country, and they're equipped to give you the best after-sales and set-up advice possible - all in person. To find your local retailer, either click the 'Buy In-Store' button on your product page for exactly the right recommendation, or head to our comprehensive Where To Buy tool.

Buy Now, Collect Locally

If you want the added convenience of only having to pop-in to store when you know the product you want has arrived, you can use our Click & Collect-style checkout process. With Buy Now, Collect Locally, your purchase takes place online and the product is then delivered direct to your local supporting retailer; ready for you to collect when you're ready. Click here to find out more about Buy Now, Collect Locally.

Buy Now

For smaller items, you can also have the ultimate convenience of purchasing directly through our website. The checkout process is entirely secure, so you can trust your information will be safe - and your desired product will arrive with you as quickly as possible.

Click here for full Terms & Conditions.

The Linear USB II is a high-end headphone amplifier and streaming pre-amplifier for users who also want to play high-resolution audio files from a PC or Laptop.

What makes the Linear USB II so special is its totally revised analogue circuitry. Featuring a discrete Class A output stage, for an open and natural sound, high-grade Low-Z Copper technology across the PCB circuitry and specially selected components – like the oversized internal power supply and low-loss MKP precision capacitors – the new model delivers physical, punchy lows and startling resolution in an open and natural soundstage over the entire frequency bandwidth, allowing your headphones to fulfil their highest potential.

For easy system matching, the Linear USB II features three Gain settings up-to 20dB and also benefits from two Neutrik headphone sockets with gold-plated contacts, which can be used simultaneously. The Left headphone output mutes the rear line-level RCA output when a headphone is connected. There is also an additional analogue RCA input for connecting more traditional line-level sources, but it’s main appeal is in the high-resolution USB digital audio input.

The Linear USB II automatically detects any incoming USB audio data stream, without the need for an input selector switch. The technology employed utilises an ESS Sabre K2M DAC chip, capable of 32-bit / 384kHz playback and DSD support (DoP) for playback of very high-resolution digital audio files.

The Linear USB II also functions very well as a streaming pre-amplifier for a full hi-fi system (when Gain is set to 0dB and no headphone is connected). With the auto-input detection and sophisticated internal layout, it offers a simple-yet-high-end solution that can easily drive long cables toward a power amplifier or active speakers.

The Linear USB II is truly a reference class pre-amplifier for all dynamic headphones. Utilising a sturdy metal housing with SSC damping feet, for effective decoupling from environmental factors, the aluminium faceplate is available in Black, Silver or Chrome finishes.

Key Features:

  • High-end headphone amplifier and streaming pre-amplifier
  • High resolution USB audio input handles 384kHz PCM and DSD (DoP) audio files
  • Two headphone outputs can be operated at the same time
  • Left headphone output isolates the line-level outputs
  • Multiple Gain settings for different headphones
  • RCA inputs for connecting traditional sources
  • Auto-detecting input system prioritises USB audio
  • Functions as a high-end pre-amplifier when Gain set to 0dB and no headphones are connected
  • Premium construction and luxury electrical components used throughout
  • Available in black, silver and chrome (£100 surcharge)

Linear D II: For users who want to play from other digital sources (link)


Technical Data

Input Impedance: 47kΩ 
Gain Settings: 0dB, 10dB, 18dB, 20dB selectable via DIP switches
Frequency Response: 10Hz (-0.3dB) to 35kHz (-1dB)
Signal-to-Noise: > 100dB at gain 0dB
THD: <0.001% at 6mW /300Ω
Channel Separation: >80dB at 10kHz
Output Power: 400 mW / 60Ω
200 mW / 300Ω
Output Impedance: Line-Out: 50Ω
Headphone Out: 5Ω 
Audio Connectors: Neutrik Headphone Jacks with Gold Plated Contacts (left headphone output mutes line out)
1 x Switching Line Out
1 x Non Switching Line Out
Gold-Plated RCA Sockets With Teflon Insulation
Power Consumption:  15W through internal, regulated power supply
Special Feature:  PC board in Low-Z Copper technology 
Vibration-absorbing SSC feet
Optional accessory: mounting kit
Digital Inputs:  1 x USB B
Sampling rate:  up to 384kHz
Resolution: up to 32 bits
Formats: PCM
Chipset: ESS Sabre K2M
Analogue filter: Silver Mica Capacitators
Max. output level DAC: 1.8 V eff
Special Feature: The analogue input is automatically activated, when no digital signal is recognised
Outer Dimensions(W x D x H): 110mm x 280mm x 44mm (4.3 x 11 x 2inch) 
Weight: 1.5kg (3.3lbs) net
Note: We’re constantly updating our website to ensure all our listings are as accurate as possible. However, the images and text on this page can be subject to change without notice, and errors and omissions are excepted.

If you have any questions, please contact us.
Product Reviews

Many of our products are firm favourites with the global hi-fi press, and this one is no exception. Check out the coveted awards and/or reviews this great product has received. To find out more click the icons below.

Click here to see all the reviews for this product.