Sugden Masterclass LA-4 Pre-amplifier

Sugden Masterclass LA-4 Pre-Amplifier: Precision Control and Pure Class A Performance

The Sugden Masterclass LA-4 Pre-Amplifier is a high-end active pre-amp designed to deliver exceptional audio fidelity with uncompromising precision. With its robust Class A output stage, gold-plated circuit boards, and advanced relay switching, the LA-4 pairs seamlessly with both Sugden’s Masterclass and Sapphire power amplifiers, offering an unmatched level of control and refinement. This pre-amplifier is engineered for audiophiles who demand absolute control over their sound, featuring carefully selected transistors, capacitors, and current shunt differential power supplies for the ultimate in audio purity.

High-Gain Amplification with Unrivalled Signal Integrity

Sugden’s LA-4 delivers powerful high-gain amplification, providing commanding control over any connected power amplifier. This pre-amplifier is designed to handle the most dynamic audio signals, thanks to its specialised circuitry and precision-engineered components. The current shunt differential power supplies deliver rapid transient response, enabling the LA-4 to handle fast-moving audio peaks and crescendos with ease. With an input sensitivity of 100mV for 1 volt output and a maximum output of 10 volts, this pre-amplifier achieves remarkable amplification with zero compromise on signal quality.

Flexible Connectivity for Comprehensive System Integration

The LA-4’s wide range of inputs and outputs makes it highly versatile, supporting seamless integration with both traditional and advanced audio setups. It includes four line-level inputs, a dedicated tape input, a balanced input, and a bypass input, offering ample connectivity options for various audio sources. The outputs comprise two line-level outputs, a fixed tape output, and a balanced output, ensuring compatibility with a wide range of power amplifiers and recording devices.

Precision Volume Control with Motorised Remote Operation

Designed for ease of use, the LA-4 includes a motorised volume control that is RC5-compatible, allowing for precise adjustments via remote. This level of control is ideal for those who value effortless access to their audio settings, particularly when fine-tuning volume levels without compromising sonic quality. Additionally, the tape output can be defeated, further enhancing the flexibility of the LA-4’s setup options.

Exceptional Audio Specifications for Distortion-Free Sound

The LA-4 boasts impressive technical specifications to ensure superior sound performance. With a frequency response of +/-0.1dB from 15Hz to 30kHz and a bandwidth of 6Hz to 300kHz, this pre-amplifier delivers a full, rich audio range that captures the finest details in music playback. A signal-to-noise ratio greater than 90dB and low distortion (<0.006% at 1kHz, 1 volt out) guarantee pristine sound quality free from unwanted noise, ensuring that every musical detail is preserved with exceptional clarity.

Elegant Design and Compact Dimensions

Built with Sugden’s hallmark durability and understated elegance, the LA-4 features a compact design that fits seamlessly into any high-fidelity audio system. Its packed weight of 7kg and dimensions of 75 x 430 x 350mm (hwd) make it a manageable yet substantial addition to premium audio setups, reflecting the quality and refinement of Sugden’s Masterclass series.