Power amplifiers stereo — Sugden Audio MASTERCLASS SPA-4

The MASTERCLASS SPA-4 is an accomplished stereo power amplifier from Sugden Audio, built with a massive aluminium housing that shields internal circuitry from electromagnetic fields while effectively dissipating heat from its output devices. The MASTERCLASS SPA-4 brings Sugden's most storied British engineering to a serious power-amplification format.

Key specs that matter

Input sensitivity is 1,000mV. Output power reaches 75W into 4 ohms. Frequency response spans a wide 15Hz to 30,000Hz within plus-or-minus 3dB. Signal-to-noise ratio exceeds 85dB. At 250 x 430 x 350mm and 25kg, the MASTERCLASS SPA-4 maintains a substantial power-amplifier chassis, with the massive aluminium housing serving the dual purpose of EMI shielding and heat dissipation.

Sound and use context

Expect a clean, well-shielded performance reflecting the substantial aluminium housing's electromagnetic protection, with the wide 15Hz-30kHz bandwidth delivering the extended frequency response Sugden's broader engineering philosophy is celebrated for.

Pairing

Sugden's own preamplifier catalogue offers natural, brand-coherent pairings, and the demanding aluminium-shielded construction suits placement near other sensitive electronics without interference concerns.

Alternatives

Sugden Audio's own broader MASTERCLASS series offers related alternatives at different power levels within the same considered engineering philosophy.