LADDER Chopin II R2R Fully Balanced Class-A Discrete Preamplifier
The LADDER Chopin II is a pure Class-A, fully balanced and fully discrete line-stage preamplifier designed for high-end analog systems. Engineered with a unity-gain architecture, precision relay volume control, and a meticulously regulated linear power supply, it delivers exceptional transparency, channel balance, and low-noise performance for discerning audiophiles seeking a dedicated preamplifier without added coloration or gain.
Pure Class-A Fully Balanced Discrete Architecture
At the core of the Chopin II is a fully differential, fully discrete Class-A amplification circuit using field-effect transistors in the output stages. The signal path maintains unity gain at 0 dB, focusing purely on source selection and precise volume control rather than adding gain. This design ensures strong noise rejection, consistent channel balance, and a highly transparent, natural presentation with excellent imaging and tonal purity.
60-Step Microprocessor-Controlled Relay Attenuator
Volume control is handled by a high-precision 60-step relay attenuator controlled by a microprocessor. Precision-matched resistors ensure accurate level matching between left and right channels across the entire range, eliminating the channel imbalance and contact degradation often associated with traditional potentiometers. The result is repeatable, transparent volume adjustment with minimal distortion.
High-Performance Linear Power Supply
Power is supplied by a 65W pure-copper toroidal transformer backed by a low-noise ERSE capacitor bank and eight independently regulated power supplies. This multi-stage regulation isolates different circuit sections, minimizing noise and ensuring stable operating conditions for the analog stages under varying loads.
Versatile Balanced and Single-Ended Connectivity
The Chopin II offers flexible connectivity with two balanced XLR inputs, one single-ended RCA input, and corresponding balanced XLR and single-ended RCA outputs. Output levels reach 4.0 Vrms via XLR and 2.0 Vrms via RCA, with carefully optimized input and output impedances for seamless integration into both balanced and single-ended systems.
Precision Construction and Low-Noise Design
Housed in a solid aluminum-alloy chassis, the Chopin II combines structural rigidity with effective shielding against external interference. Gold-plated single-crystal copper RCA terminals and carefully selected internal components further support signal integrity and long-term reliability.
About LADDER
LADDER is a high-fidelity audio brand specializing in discrete, high-performance analog and digital components. Focusing on pure Class-A designs, precision engineering, and transparent musical reproduction, LADDER products are developed for audiophiles who value accurate signal control and refined system synergy.
Technical Specifications
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% (manufacturer specified)
SNR: 120 dB
Dynamic Range: >121 dB
Stereo Crosstalk: −110 dB
Power Supply: 65W pure-copper toroidal transformer with eight independent regulated supplies
Power Consumption: 1W idle, 20W operational
Chassis: Aluminum alloy
Dimensions: 320 x 330 x 60 mm
Net Weight: 6.5 kg
Available Colors: Black, Silve
Q&A
What type of amplifier is the LADDER Chopin II?
It is a pure Class-A, fully balanced, fully discrete line-stage preamplifier with unity gain.
Does the Chopin II have a built-in DAC?
No, it is a dedicated analog preamplifier and requires an external DAC or analog source.
What volume control system does it use?
It employs a 60-step microprocessor-controlled relay attenuator with precision-matched resistors.
What are the available inputs and outputs?
Inputs include two balanced XLR and one single-ended RCA. Outputs include balanced XLR and single-ended RCA.
What is the power supply design?
It uses a 65W pure-copper toroidal transformer with eight independently regulated power supplies and an ERSE capacitor bank.
