Lehmann Audio Linear USB II Headphone Amplifier

  • From £1,700.00
  • (FREE UK Delivery)
| Usually dispatched within 24 hours

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.

Technical Specifications:
  • 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) / 1x Switching Line Out / 1x 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 / DOP / FLAC / MP3 / WAV
  • 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

We endeavour to despatch same day for orders placed up to 12 noon on available stock items (items with stock message "Usually dispatched within 24 hours"). Please remember to check with us first for a physical stock check if next day delivery is important to you. Any items with stock message "Usually dispatched within 72 hours" are items that we do not hold in stock but order in from the importer or manufacturer as soon as a customer order is recieved. Occasionally these may be delayed beyond 72 hours due to importer/manufacturer stock levels but we will inform you as soon as we can if this is the case.

UK ORDERS:  We despatch the bulk of our UK mainland items on a 24 hour service – Free of Charge.  Non Mainland locations - Isle of Man, Isle of Wight, the Scilly Isles, the Scottish highlands and Islands, the Channel Islands and Northern Ireland may take a day or so longer and are not Free of Charge. Smaller items are delivered using Royal Mail recorded delivery or special delivery. Larger items are delivered using a courier service such as Interlink Express, DPD, UPS or DHL. 

INTERNATIONAL ORDERS: We offer competitive rates which can be confirmed by email. Please just ask – we will need a full delivery address and telephone number. Smaller items are delivered using Royal Mail Small Packets Airmail with International Tracked and/or Signed depending on value of item and availability of the service. Larger International shipments are sent by insured and tracked services using DPD, DHL or UPS. If there are any delays due to specific customs regulations, etc, you will be contacted by Turntableworld or by the courier with a request for any further information required. Customs duties do not apply for shipments into any EU country (for a full list please refer to the EU Country List). Customs duties can apply for countries outside of the EU. Customers in these countries are responsible for all taxes and duties incurred when the items enter their country.

COLLECT IN STORE OR HOME INSTALL:At the request of the manufacturer some items cannot be supplied by mail order but you can click and buy them and then elect to collect them from our store or arrange a home install (if applicable). Applicable items clearly state that they are Collect in store or home install. Once ordered you will receive a message prompting you to contact us by phone or email to arrange for us to deliver and install or to reserve and collect from our store at your convenience, you will also be advised of the delivery time / stock availability as not all Home install / collect in store items are held in stock. 

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