L1 Dual Monaural Line Preamplifier

  1. General
  2. Features
  3. Options
  4. Specifications

The uttermost quality of a preamplifier is its transparency. The source is selected and the volume is applied, however the original audio characteristics and signal dynamics are fully retained. The L1, a dual monaural analog line level preamplifier, was developed using this approach. It is a pure class A, ultra low noise, high bandwidth, fully balanced transistor based design. It provides the shortest path between input and output, maintaining the highest speed, transparency and musicality, allowing the L1 to become a truly exceptional preamplifier.


Three L1 configurations are available:

  • Monaural operation, with 8 inputs
  • Stereo operation, with 8 inputs for each channel
  • Monaural operation, with 16 inputs
Volume control

For each channel two R-2R ladder network in balanced mode control the volume. Tight tolerances high-grade metal film resistors as well as fast switching, distortion-free analog switches are used to adjust precisely the listening level. Each ladder has the following features:

  • 20bits R-2R ladder network
  • 118dB volume range in 0.5dB steps, from -100dB to +18dB
Analog Signal Path

Each channel is physically mounted on its own board to ensure the best immunity against crosstalk, and has the following features:

  • Ultra low noise, high bandwidth, high slew rate design
  • Pure class A, fully symetrical design
  • Fully discrete transistor based circuitry
  • Phase inversion and Mono modes
Power Supply
  • Dedicated discrete regulated linear power supplies
  • Ultra low noise, high accuracy regulation
  • Oversized mains transformer
  • Shunt regulators for critical stages
  • Over-current protection
  • Can be powered from the X1 External Power Supply
Analog Audio Inputs
  • Four balanced XLR connectors
  • Two single-ended RCA connectors
  • Two high-bandwidth coaxial BNC 50 Ohm connectors
Analog Audio Outputs
  • Powerful discrete output buffer
  • Two balanced XLR connectors
  • One single-ended RCA connector
  • One high-bandwidth coaxial BNC 50 Ohm connector
Options boards

L1 Enclosure

 L1 enclosure

L1 enclosure

The addition of a second L1 enclosure transforms the L1 into a True Monaural preamplification system. The power supplies inside each enclosure are devoted to a single channel, further enhancing the noise performances of the system. The units are
controlled simultaneously. More units can be linked together in a multichannel system.


L1 Preamp board

Monaural analog preamplifier board

In a True Monaural system (with two enclosures), each enclosure is able to receive an extra
preamplifier board. This turns the L1 into a True Monaural Extended system, providing
the preamplifi er with twice as many inputs, ideal for larger systems.
External power supply




X1 external power supply

Improves the overall L1 performances by adding an external power supply unit.

Same unit dimensions as the L1

Analog inputs
Inputs type

4x Balanced XLR (8x in extended monaural configuration)
2x Single-Ended RCA (4x in extended monaural configuration)
2x Single-Ended BNC (4x in extended monaural configuration)

Input impedance Balanced (XLR): 100kΩ or 600Ω
Single-Ended (RCA and BNC): 50kΩ or 300Ω
Maximum input level Balanced (XLR): 16V RMS
Single-Ended (RCA and BNC): 8V RMS
Analog outputs
Frequency response DC - 1MHz
Total Harmonic Distortion + Noise < 0.001%, 1kHz, unity gain
Signal to Noise Ratio 130dB, unity gain and at maximum input level
Volume control
Topology 20bit R-2R resistor ladder network
Range 118dB range in 0.5dB steps, from -100dB to +18dB
Display 480x272 pixels, 24bits color, AMOLED
Mains operation Selectable 100V, 115, 230V AC, 47-63Hz
Fuses value and location Standby fuse (black holder): 250mA T (230V AC), 500mA T (100V AC, 115V AC)
Main fuse (white holder): 1.6A T (230V AC), 3.15A T (100V AC, 115V AC)
Power supply consumption <1W (standby), 100W max in operation
Dimensions/Weight 440 x 440 x 133mm (W x D x H), 20kg
Remote control

IR remote control provided, RC5 codes
Ethernet based system control via the Android CH Control App

Adobe-PDF-Document-icon Product flyer
Adobe-PDF-Document-icon User manual
Compressed-File-Zip-icon L1 firmware version 1.8 (release date 2017-12-28)

CH Control application 2.2.1 (release date 2018-01-03)