Balanced line-stage preamplifier

The Ladder Chopin II is a fully-balanced, fully discrete Class-A line-stage preamplifier with precise analog volume control and low-noise power delivery. It combines XLR and RCA connectivity, a microprocessor-controlled 60-step relay attenuator, precision-matched components, a 65W toroidal transformer, and remote operation in an aluminum-alloy chassis.

Fully-balanced Class-A architecture

The Chopin II uses a fully-balanced differential amplification circuit with discrete field-effect transistors for output amplification. The signal path is designed for strong noise rejection and consistent channel balance, with a specified signal-to-noise ratio of 120 dB and stereo crosstalk of -110 dB.

60-step relay volume control

A microprocessor-controlled, relay-based 60-step attenuator handles volume adjustment. Precision-matched resistors and components support accurate level changes and channel tracking, while the front-panel display provides a clear indication of the selected input and volume setting.

Low-noise linear power supply

A 65W pure-copper toroidal transformer supplies the preamplifier, supported by a bank of ERSE capacitors. Eight independently regulated power supplies distribute power throughout the circuitry to help maintain stable operating conditions and limit electrical noise.

Balanced and single-ended connectivity

The rear panel provides two balanced XLR input pairs and one RCA input pair for source components. Outputs are available through both balanced XLR and single-ended RCA connections, making the Chopin II suitable for integration with a range of power amplifiers and active audio systems.

Gold-plated RCA terminals

Gold-plated single-crystal copper RCA terminals provide the single-ended analog connections. The connector design complements the preamplifier’s emphasis on precision components throughout the analog signal path.

Front-panel controls and display

The left control provides power, source selection, standby, and mute functions, while the right control adjusts volume. A central display shows operating information at a glance. Remote control is also supported for convenient adjustment from the listening position.

Compact aluminum-alloy chassis

The aluminum-alloy enclosure keeps the component relatively compact while accommodating the discrete audio circuitry and substantial linear power supply. The product imagery specifies chassis dimensions of 12.6 x 13.0 x 2.4 in (320 x 330 x 60 mm).

Product highlights

• Pure Class-A, fully discrete line stage
  
• Fully-balanced differential circuit architecture
  
• Microprocessor-controlled 60-step relay attenuator
  
• Precision-matched resistors and components
  
• 65W pure-copper toroidal transformer
  
• Eight independently regulated power supplies
  
• Low-noise ERSE capacitor bank
  
• Two balanced XLR input pairs
  
• One stereo RCA input
  
• Balanced XLR and single-ended RCA outputs
  
• Gold-plated single-crystal copper RCA terminals
  
• Front-panel display
  
• Remote control
  
• Aluminum-alloy chassis

Specs

• Product name: Ladder Chopin II
  
• Amplifier architecture: Pure Class-A, fully-balanced, fully discrete line stage
  
• Volume control: 60-step microprocessor-controlled relay attenuator
  
• Inputs: 2 x stereo XLR, 1 x stereo RCA
  
• Input impedance: 12.2 kΩ single-ended, 60 kΩ balanced
  
• Outputs: Stereo RCA, stereo XLR
  
• Output level: 2.0 Vrms RCA, 4.0 Vrms XLR
  
• Output impedance: 200 Ω single-ended, 400 Ω balanced
  
• Gain: Unity gain, 0 dB
  
• Frequency response: 10 Hz–80 kHz, -0.3 dB
  
• THD+N: 0.00% as specified by manufacturer
  
• SNR: 120 dB
  
• Dynamic range: Greater than 121 dB
  
• Stereo crosstalk: -110 dB
  
• Power supply: 65W toroidal transformer
  
• AC power requirement: 100–240 VAC, 50/60 Hz
  
• Power consumption: 1W idle, 20W operational
  
• Chassis material: Aluminum alloy
  
• Dimensions: 12.6 x 13.0 x 2.4 in (320 x 330 x 60 mm)
  
• Net weight: 14.3 lb (6.5 kg)
  
• Gross weight: 21.4 lb (9.7 kg)
  
• Available colors: Silver, black
  
• Warranty: 12 months

What’s included

• Ladder Chopin II preamplifier
  
• Remote control