Cart  US $3,599



Prelude 3.1-LE is a tube based fully balanced headphone amplifier and pre-amp. Standard 6.5mm jack of Single-Ended separated High/ Low impedance, XLR Combo Jack of balanced output and Independent Pre amp RCA output. You can easily select Low / High Ohms Headphone Outputs, Pre-out and Mute function on the panel fascia. The signal input and headphone output are galvanically insulated, therefore your hearing and headphone is safely protected by shutting off the inrush current that occurs at power on-off. Designed with Supermalloy Transformer so that it realized wide frequency characteristics and also play the transparent sound by class -A triode operation in non-feedback design. In particular, the dual mono function of the power supply and balance amplifier function provides transparent sound.

Fully Balanced Differential Amplifier


  • Hand wired Point-to-Point
  • NonFeedback ,Triode Pure Class-A
  • Dual Mono Toroid Power Transformer
  • Dual Mono Symmetric Differential Amplifier
  • Supermalloy Transformer Coupled
  • Improved Phase Shift
  • Single ended, or balanced headphone output
  • True Balanced Topology
  • 6N1P-EV Front-End
  • 6AS7G Output Driver
  • 4 Outputs Selector (1.Off, 2.Low-Z, 3,High-Z, 4.Pre-Amp)
  • 2 Input Selector ( Up: XLR, Center : Mute , Down: RCA)
  • 6.3mm low/high impedance jacks
  • XLR Balanced Output (L/R) jacks
  • 1 x Balanced XLR Input
  • 1 x Unbalanced RCA Input
  • 1 x RCA Unbalanced Pre Out
  • ALPS Blue Velvet Quad Potentiometer
  • WIMA MKP capacitors
  • 1% Metal Film Resistors
  • Super Cu CMC RCA Jack
  • Swiss Neutrik XLR Combo Connector

Dual Mono Symmetric Design


  • Rate Output : 1W rms / @30Ω, 300mW / @600Ω
  • Headphone Jacks : (6.5mm + XLR Combo Jack)
  • Output Impedance : 16Ω - 600Ω
  • Headphone Impedance Low-Z (16Ω - 80Ω)
  • Headphone Impedance High-Z (100Ω - 300Ω - 600Ω)
  • Single Ended Output select Low-Z or High-Z
  • Balanced Output select ( Default Factory Set : High-Z )
  • THD at 300mW /1kHz: 0.1%
  • S/N Ratio: 98 dB
  • Frequency Response: 10Hz to 80kHz (0, -3㏈)
  • Tubes: 6N1P-EV 2ea, 6AS7G 2ea, Self Biasing
  • Input Impedance : Unbalance : 100kΩ, Balance : 200kΩ
  • Pre-amp Gain: 12 dB ( 4 x )
  • Pre-amp Output Impedance : 150Ω
  • Hum & Noise : Less than 0.1mV
  • No White Noise
  • Power Consumption : 80Watt ( 117V/230V AC / 50Hz 60Hz)
  • Unpacked Dimension (mm): W260×H185×D310
  • Shipping Weight: 15kg

  Recommended Headphones

  • Audez'e: LCD-X (20Ω), LCD-XC (20Ω)
  • Fostex: TH900 (25Ω)
  • Denon: D5000, D7000 (25Ω)
  • Audez'e: EL-8 (30Ω)
  • Grado: RS-1 ,GS1000 (32Ω)
  • Ultrasone: Edition- 8, 9 (30Ω), -10 (32Ω)
  • audiotechnica: ATH-W1000(X) ,W5000, W3000ANV (40Ω)
  • AKG: k701, k702 (62Ω)
  • Focal: Utopia (80Ω)
  • Audez'e: LCD-2 (70Ω), LCD-3 (110Ω), LCD-4 (200Ω)
  • Sennheiser: HD600, HD650, HD800 (300Ω)
  • audio-technica: ATH-ADX5000 (420Ω)
  • Beyerdynamic: T1 (600Ω)
    More info.

BTO, Shipment in 2 months by DHL / FedEx
International price $3,599 ( USD )

free worldwide shipping include insurance


The Prelude 3.1-LE offers manufacturer’s warranty of ONE YEAR from the date of purchase. The warranty is transferable to a second owner with no questions asked.


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