SUGDEN MASTERCLASS IA4

Class A Integrated Amplifier.

The Sugden Masterclass IA-4 integrated amplifier represents the flagship model of the Sugden range and is the most popular in the series. Weighing a solid 20 kilograms, the IA-4 boasts a purposeful look and impressive build quality. It offers a wide range of inputs and outputs, including a high-quality phono stage. The Class A output circuit has been upgraded from the A21 series with a more powerful power supply and improved output and damping capacitors. The gold-plated circuit boards, full relay switching, and precision input selector switch further enhance the build quality.

The preamplifier section of the IA-4 is a bespoke design, delivering surprising clarity and attention to detail. The most notable feature of this amplifier is its ability to create a large performance with depth and height that engages every type of music. Despite having only 33W output into 8 ohms, the IA-4 is a Class A amplifier capable of delivering impressive performance.

The Sugden Masterclass IA-4 integrates a state-of-the-art preamplifier with Sugden's classic Class A output stage, also including an MM phono stage.

The bass of the IA-4 is highly appreciated, showing a good balance between depth, control, and impact. It presents itself in a way that enchants, giving a more natural musical pace to the tracks.

Another strong point of the IA-4 is its midrange, which stands out for its prominent presence and significant attention to detail. The vocals are brought forward, close to the listener, with a full and rich presence and excellent extension. The instruments are no exception and exhibit good detail and texture. Violins, cellos, and pianos sound magnificent on the IA-4, with a vibrant presentation that evokes the harmonics typically found in tube amplifiers.

The treble is bright and detailed, performing well in this range without ever being intrusive.

Voices are one of the aspects the IA-4 handles with great mastery. They appear close, natural, full-bodied, and textured, with an extension that allows you to perceive every nuance.

Regarding transients, the attack is good, without being too strong or aggressive, while the decay has a tube-like quality without slowing down the sound. Overall, the IA-4 offers an interesting balance between these two aspects, resulting in a relaxed and musical sound signature with a good pace.

The IA-4 is an amplifier that captivates. Its sound signature is truly pleasant, combining the best of solid-state and tube sound. It has an effortless sound quality that allows the music to flow naturally, immersing the listener in an authentic musical experience. If you appreciate this type of sound, the IA-4 is certainly worth considering.

Technical Specifications:

• Inputs: Three line-level inputs, one tape, one Moving Magnet phono, one balanced
• Outputs: Variable pre-out, fixed output, loudspeaker output
• Volume Control: Remote control compatible with RC5
• Tape: Monitor and record off
• Input Sensitivity: 125mV for maximum output
• Phono Input Sensitivity: 2mV Moving Magnet
• Power Output: 33 watts into 8 ohms with both channels active
• Frequency Response: 14Hz to 200kHz +/- 1dB
• Bandwidth: 6Hz to 300kHz +/- 3dB
• Signal to Noise Ratio: >84dB
• Net Weight: 20 kg
• Overall Dimensions (including terminals): 165mm x 430mm x 440mm (H x W x D)