Holo Audio Serene L2 KTE Fully Balance Discrete High End Pre-amplifier

S$ 4,500.0

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  • Serene L2 KTE is an extremely quiet and capable preamp that continues to maintain the house sound of open and layered Holo Audio house sound signature. With the right adapter, it can even be used as a powerful headphone amp for almost any of the power-hungry headphones out there. QA is now the authorised dealer in Singapore to get it.
  • Official 3-year warranty from Holo Audio supported by QA.
  • Be in a peaceful mind such major purchase will be delivered to you free from all import or custom duty hassles.
  • Under normal customs clearances, purchase to delivery will take no more than 7 days.
  • The lush layerings with broad soundstage while ever sounding so musical.
  • Fully smooth on all edges of sound with such natural timbre and texture, yet micro details and finesse continue to resolve.
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Serene is a preamplifier from HoloAudio. Serene adopts a fully balanced structure. The left and right channels are completely separated to form a fully balanced structure. Each channel has independent amplification modules to complete the buffering and amplification functions.

This design is able to solve the shortcomings of transistors, so that its tone can exceed the limits of traditional transistors. It also has both the advantages of tubes and transistors. And the use of a large number of transistors makes the linearity of the amplifier superior in every way. The volume control of the Serene is a fully balanced stepping device controlled by a relay. Each step is 1 dB volume. The advantage is that the noise is minimal, and it can be precisely controlled, even at a low volume the left and right channel will not be biased.


  • The Serene features a completely balanced design with 4 sets of channels, where each left and right channel is fully discrete. Each channel is equipped with two separate amplification modules to handle buffering and amplification functions, resulting in a total of 8 amplification modules.
  • The 8 amplification modules in the Serene are designed to be fully discrete, addressing the inherent shortcomings of transistors through innovative structural design and implementation. This design allows the tone to surpass the limitations of traditional transistors by utilizing paired transistors to achieve superior linearity, combining the benefits of both electron tubes and transistors.
  • Serene boasts a power supply that is completely independent from the secondary transformer, creating a dual mono amplifier configuration within the chassis. This setup enables a channel separation performance of over 130dB, ensuring a perfectly reproduced sound field.
  • The volume control in the Serene is a fully balanced stepping device that is relay-controlled. The relays used are of the highest quality, featuring Silver Palladium (AgPd) Gold Plated contacts. With a total of 84 steps, each step representing 1dB volume adjustment, the volume control ranges from -78dB to +6dB. This design ensures ultra-low noise and precise control at low volumes, preventing any imbalance between the left and right channels. The matching accuracy of the left and right channels across all volume levels is within +/-0.1dB.

L2 (same as KTE)

  • Flat copper wire O-type transformer which was also used in the Holo Audio May DAC.
  • Pure silver wire from IEC to power board w/Silver Rhodium plated Faston connectors
  • Red nano fuse we used in the HOLO Audio May KTE.
  • Holo audio caps and a 7N O-type transformer
  • 4pcs 5uF/350V Bi-polarized AudioNote Kaisei capacitors.
  • CNC Aluminum Remote Control
  • emblem on top of chassis


Maximum amplitude 12Vpp
Input impedance 6.8KΩ

Maximum amplitude 24Vpp
Input impedance 13.6KΩ

Maximum amplitude 8.5Vrms
Output impedance 20Ω

BALANCED XLR OUTPUT 1 (this can actually be used to power headphones from this output using adapter that is dual 3pin F XLR to single 4pin F XLR)
Maximum amplitude 17Vrms
Output impedance 3Ω

Maximum amplitude 17Vrms
Output impedance 40Ω


Dimensions: 430 mm (W) * 300 mm (L) * 55 mm (H) additional 12 mm for machined feet

Weight: 9 kg or about 19.84Lbs

Configurable power input
220-230V 50/60Hz – Use Fuse Type 2A SB 5x20mm (when internal switches are set@220v)
110-115V 50/60Hz – Use Fuse Type 4A SB 5x20mm (when internal switches are set@110v)

Power consumption: 30w

Included Remote Control

Click here for English Manual


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