In February, we sent a pair of 1151 Mono Power Amplifiers to Jason Victor Serinus at Stereophile. You can read his full review on the 1151s here. Jason’s first impressions set the tone immediately: “My initial impressions were uniformly positive. More than positive. Boulder’s 1151 monoblocks sounded really beautiful.” We were thrilled by his response, and even more so when the 1151 Mono Power Amps were later selected for Stereophile’s “Recommended Components: Fall 2025 Edition.”
The 1151 Mono Power Amplifiers represent a genuine leap forward in amplifier design. At their heart is our newly developed “Smart Current” output stage, a groundbreaking approach to biasing. Unlike traditional Class A schemes, “Smart Current” continuously monitors the current drawn by the speaker and automatically adjusts in real time. This gives you all of the sonic benefits of a traditional class-A amplifier without the typical inefficiencies like wasted heat. No matter the frequency or volume, this system reduces crossover distortion to levels so vanishingly low they are nearly inaudible.
This innovation extends beyond the 1151s—the entire 1100 Series, including the 1162 and 1163 Stereo Power Amplifiers, incorporates the same Smart Current design. In every listening test, the result has been clear: greater transparency, clarity, and realism.
We invite you to hear the difference for yourself. Contact your nearest Boulder dealer or distributor to arrange an audition and experience what makes the 1100 Series so exceptional.
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