PRICE IS FOR THE PAIR.
Pure Power. Uncompromising Performance.
Experience the next level of high-end audio with the Boulder 1151 Mono Power Amplifier—a true statement piece for discerning audiophiles who demand nothing less than absolute fidelity. Crafted in Boulder, Colorado with a legacy of precision engineering, the 1151 embodies the power, control, and nuance required to bring your music to life exactly as the artist intended.
As a dedicated mono amplifier, the 1151 delivers 1,500 watts into 8 ohms, scaling up to an astonishing 6,000 watts into 2 ohms—all with unwavering stability and clarity. It’s designed to effortlessly drive even the most demanding speaker systems with dynamic headroom and effortless authority.
Housed in a beautifully machined chassis with signature Boulder aesthetics, the 1151 is not just built—it’s sculpted. The amplifier utilizes Boulder’s proprietary 2000-series gain stages and discrete circuitry to ensure exceptionally low distortion, ultra-low noise, and a breathtakingly open soundstage. Each unit features independent, dual power supplies for optimal performance, paired with precision-ground internal grounding and thermal efficiency that guarantees cool, quiet operation—even under the most demanding conditions.
With balanced XLR input only, the 1151 is designed for true high-end systems, offering DC coupling throughout for unmatched transparency and transient response. Every detail—from the hand-assembled boards to the meticulously finished aluminum enclosure—reflects Boulder’s uncompromising commitment to quality.
Whether you’re building a reference two-channel setup or elevating your current system, the Boulder 1151 offers unrelenting power with musical finesse. It is not just an amplifier—it’s a declaration of sonic excellence.
Key Features:
1,500W into 8Ω / 6,000W into 2Ω output power
Fully discrete, balanced, dual-mono design
Proprietary Boulder 2000-series gain stages
CNC-machined aluminum chassis with thermal optimization
Balanced XLR input only
Precision-regulated power supply and DC coupling
Handcrafted in the USA
350W peak power per channel into 8 ohms, 600W peak power into 4 ohms, 750W peak power into 2 ohms
Space saving design is the same footprint (width and depth) as the 1110 Preamplifier and 1161 Stereo Amplifier and allows the use of a standard power cord
Class-A Smart Current biasing circuit
Newly developed protection circuitry safely and immediately shuts down the output section in case of shorted speaker cables or faults in the system and allows for greater peak power output
Smaller carton packaging means easier transportation, unpacking, and installation
Truly balanced input connections and output stage as with other 1100 Series products
Output stage uses 40 output transistors and 12 supply capacitors per chassis to ensure stable, high-power output into any load while maintaining detail and clarity.
The 1151 provides high amounts of current, making even the most difficult speaker perform to its fullest potential.
Dual speaker connections via easy to connect, high-current speaker terminals to accommodate bi-wired loudspeakers
