Dan D'Agostino Progression S350 Stereo Amplifier

Serious monoblock engineering, packaged for people who don't want two amplifiers taking up the room.

Ken Kessler described a soundstage that was "massive – and I mean gigantic." — Hi-Fi News

"It's exemplary from top to bottom." — Jose Victor Henriques, Hi-Fi News

The S350 borrows its most important trick straight from D'Agostino's monoblocks: Super Rail circuitry. In a normal amp, the music signal never quite reaches the full voltage of its power rails — there's always some loss. Super Rail closes that gap by boosting voltage just before the output stage, so the amp has more real headroom to work with exactly when a dynamic passage demands it. The upshot is tighter, more controlled bass and a grip on your speakers that just doesn't let go.

None of that comes at the cost of finesse, either. A 2,000 VA transformer and nearly 100,000 μF of capacitance back up 48 output transistors — the same high-power devices developed for the flagship Relentless amps — and massive, single-billet aluminum heatsinks keep everything running cool even at full output. That combination is what lets the S350 push 350 watts per channel into 8 ohms without breaking a sweat, and simply doubling that as speaker impedance drops.

If you want monoblock-level command over your system in one chassis, instead of two, this is it.