Boulder Amplifiers 2150 Mono Power Amplifier
Best reference level amplification for discerning audiophiles.
The Boulder Amplifiers 2150 Mono Power Amplifier represents the pinnacle of 30 years of amplifier design, succeeding the renowned 2050. This amplifier delivers an astounding 1000W into any load, earning it Stereophile magazine’s Amplification Product of the Year award. It features computer-designed, damped circuit boards, dual toroidal transformers for silent operation, and a dual gain stage design for maximized bandwidth. Engineered as a fully-balanced, true monaural amplifier, it ensures an ideal loudspeaker interface with massive instant power delivery from 80 bipolar output transistors and full Class-A biasing.
$69000.00
Owner Satisfaction
4.8
/ 5
Category Rank
38
/ 2552
#38 in Power Amplifiers
Price vs Category Average
+736%
Above average
Peak Power, 8 Ohms
1000
/ W
Who it's for
- Discerning audiophiles seeking ultimate fidelity and emotional connection to music.
- Enthusiasts with challenging speakers desiring limitless headroom and dynamic impact.
- Luxury audio collectors valuing heirloom-quality components and lasting value.
Who should skip it
- Budget-conscious music lovers or those seeking high-value audio solutions.
- Apartment dwellers or individuals with limited space and physical handling capabilities.
- Newcomers to high-end audio or those preferring simpler system integration.
Performance breakdown
Power Delivery
Massive 1000W output effortlessly drives even the most demanding loudspeaker loads.
Signal Purity
Class-A biasing and ultra-low distortion ensure a pristine, transparent sonic signature.
Build Integrity
Heavy-duty construction and 80 bipolar transistors define industrial-grade longevity and stability.
Dynamic Range
Dual gain stage design provides exceptional bandwidth for highly detailed musical transients.
Noise Floor
Potted toroidal transformers maintain near-silent operation for absolute background quietness.
Connectivity Versatility
Balanced XLR inputs and dual speaker terminals offer flexible, high-fidelity system integration.
Key Specs
Peak Power, 8 Ohms
1000W
Peak Power, 4 Ohms
2000W
Peak Power, 2 Ohms
4000W
THD, 8 Ohms, 1000W
20-2 kHz: 0.0008%, 20 kHz: 0.0035%
THD, 4 Ohms, 1000W
20-2 kHz: 0.0009%, 20 kHz: 0.0045%
THD, 2 Ohms, 1000W
20-2 kHz: 0.0014%, 20 kHz: 0.0090%
Frequency Response
-3dB @ 0.015 Hz, 200 kHz
Equivalent Input Noise (EIN), 20 kHz BW
1.5 μV
Features
- Exceptional power output of 1000W into any load
- Award-winning design recognized by Stereophile
- Advanced circuit board design for minimal distortion
- Silent operation with potted dual toroidal transformers
- True monaural design for ideal loudspeaker interface
- Full Class-A biasing for optimal performance
- Massive power delivery from 80 bipolar output transistors
- Dual speaker connections for bi-wired loudspeakers
What customers say
Customers consistently laud the Boulder 2150 Mono Power Amplifier for its unparalleled sound quality and meticulous build. Reviewers frequently highlight its ability to reproduce audio with astonishing clarity, depth, and dynamic range, creating an immersive listening experience. The amplifier's robust construction and sophisticated design are also recurring points of praise, reflecting a product crafted with precision and an unwavering commitment to high fidelity. Owners often describe it as a significant investment that delivers a truly transformative audio journey, justifying its premium position in the market through sheer performance and enduring craftsmanship.
Know before you buy
A true monaural design means each amplifier is dedicated to a single channel, eliminating crosstalk and interference between left and right signals. This configuration provides superior channel separation and ensures that each speaker receives its own independent, high-current power supply.
Yes, the 2150 is a high-performance component that can consume up to 5000W at maximum output. It is recommended to ensure your dedicated listening room circuit can handle the power requirements and that you have adequate ventilation for the heat generated by its pure Class-A operation.
Yes, the 2150 features two sets of output connectors specifically designed to accommodate bi-wired loudspeaker configurations. This allows you to connect the high and low-frequency sections of your speakers separately for improved signal integrity.
Pure Class-A biasing ensures that the output transistors are always conducting, which eliminates crossover distortion and provides a highly linear, smooth, and detailed sound profile. This design is widely considered the gold standard for sonic purity in high-end audio.
The 2150 is designed primarily for balanced operation using 3-pin XLR inputs, which offer superior noise rejection. While it features high input impedance for both balanced and unbalanced connections, it is optimized for a fully balanced signal chain.
Each unit weighs 220 lbs, so you will need a very sturdy, reinforced equipment stand or dedicated floor space. Because it operates in Class-A, it generates significant heat, so you must provide ample clearance above and around the unit for proper airflow.
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$69000