Sugden Masterclass SPA-4 // New / Solid State Stereo Power Amplifier / 75wpc

The Sugden Masterclass SPA-4 is the kind of power amplifier that makes you stop thinking about gear and start paying attention to music. Its Class A circuit — the same DNA as the mono MPA-4 — runs warm and unhurried, rendering transients with authority rather than aggression. Where some solid-state amps impose a clinical edge on the midrange, the SPA-4 stays remarkably composed, coaxing texture from strings and breath from vocals. The fully balanced topology adds a low-noise foundation that lets the quieter passages emerge intact. Control is real here, not euphonic softening — bass lines stay articulate even as the soundstage opens wide.

Condition

NEW

Factory Specs

Input Stereo line level, stereo balanced

Output Stereo pair multi-way locking binding posts

Input Sensitivity 1V for full output

Power Output 75W into 4 Ohms (both channels driven)

Frequency Response ±0dB, 15Hz–30kHz

Bandwidth –3dB points, 2Hz–200kHz

Signal to Noise >85dB

Dimensions 9.84 x 16.93 x 13.78 in (H x W x D) [250 x 430 x 350mm]

Gross Weight (packed) 55.1 lbs [25kg]

Documentation

Sugden Masterclass SPA-4 Owner's Manual

Liner Notes

The popularity of the Masterclass series has resulted in over seventeen years of continuous production. Offering an excellent price/performance ratio it is easy to see why it remains so successful. With an abundance of headroom, the MPA-4 mono power amplifiers deal easily with heavy complex music, allowing the low level detail to be heard clearly and accurately. Boasting a fully balanced circuit design, it can be the engine room of a fully balanced hi fi system.

The SPA-4 is a stereo version of the MPA-4 and uses the same class A circuit. The only differences are power output and the additional flexibility of both single ended and balanced inputs. Not every music lover can accommodate two substantial power amplifiers in their listen space, so a single SPA-4 could be the solution. One of the noticeable abilities of the SPA-4 is how well it works with smaller loudspeaker designs as well as large ones. Control and soundstage are two key elements of the SPA-4 making it a fine power amplifier.

Stock No.

15481104236765