Note that this is a discontinued product. You may want to visit the brand's page here to browse their newer products.
What reviewers think
Bloggers and YouTubers have tried this product—so we've summarized their strongest opinions below. Links to full reviews follow.
All
3060
reviews

Manufacturer details
- Peak Power, 8 Ohms: 1000W
- Peak Power, 4 Ohms: 1650W
- Peak Power, 2 Ohms: 2000W
- THD, 8 Ohms, 900W: 20-2 kHz: 0.0006%, 20 kHz: 0.0025%
- THD, 4 Ohms, 900W: 20-2 kHz: 0.0008%, 20 kHz: 0.0030%
- THD, 2 Ohms, 900W: 20-2 kHz: 0.0012%, 20 kHz: 0.0045%
- Equivalent Input Noise (EIN), 20kHz BW: 1.5 μV
- Magnitude Response, 20 to 20KHz: +0.00, -0.04 dB
- Magnitude Response, -3dB at: 0.015 Hz, 200 kHz
- Voltage Gain: 26dB
- Input Impedance: Balanced: 200KΩ, Unbalanced: 100KΩ
- Common Mode Rejection (Balanced only): 60 Hz: 90dB, 10 kHz: 70dB
- Inputs: 3-pin balanced (XLR)
- Output Connectors: 2 sets of 6 mm / .250 inch wingscrews
- Power Requirements: 220-240 VAC 50-60 Hz, 300W nominal, 6000W at maximum output
- Weight: Amplifier: 355 lbs. (161 kg), Base: 86 lbs. (39 kg), Shipping: 563 lbs. (256 kg)
Brand highlights
Taking a step back to look at reviewers' thoughts of the brand's entire lineup—not just this product—what stands out most is the following:
- Boulder prioritizes a "straight wire with gain" philosophy, focusing on neutrality and avoiding any specific sonic signature, allowing the source material to dictate the sound.
- The brand is known for a distinct industrial design, often featuring topographical contours and heatsinks that are considered aesthetically pleasing.
- They are committed to building all components in-house, including metalwork and circuit boards, to maintain exceptional quality control and durability, resulting in products with high secondary market value.
- Boulder's products are designed for long-term use and reliability, withstanding daily use and long periods of being left on with excellent circuit protection, although power consumption can be high.
Select products
Boulder 861
- Positioning: The entry-level model in Boulder's lineup, designed for smaller spaces and efficient systems.
- Description: Offers a compact design with 75W peak power per channel, making it ideal for small rooms or setups where space is limited.
Boulder 1161
- Positioning: A mid-range option, offering a balance between size and power for those who need more than the 861 but less than the 1160.
- Description: Delivers 200W peak power per channel. It shares the same operational features as the larger 1160 but in a more manageable size.
Boulder 1160
- Positioning: A high-performance model in the 1100 series, offering significant power and advanced features.
- Description: With 300W per channel, it features improved thermal management and a new grounding system, setting it apart from the 1161 by offering greater power and clarity.
Boulder 2160
- Positioning: A premium model in the 2100 series, offering top-tier performance and power.
- Description: Provides 600W per channel, making it one of Boulder's most powerful amplifiers. It features a fully-balanced design and advanced thermal management, surpassing the 1160 in power and performance.
Boulder 3060
- Positioning: The flagship model, representing the pinnacle of Boulder's amplifier technology.
- Description: Delivering 900W per channel, the 3060 is designed for the ultimate audio experience, with unmatched power and precision. It features a pure Class A operation and extensive use of Boulder's highest performing gain stages.
Our take on the brand
Look inside the brand
Our interview with the brand
What are two key technological innovations or strong opinions that differ you from other brands?
What's your approach to customer support?
What are your favorite tracks for showcasing the strength of your products?
What other products pair best with yours?
Used
Boulder
What if you spend more?
What competes at this price?
Our Summary
Product Strengths
- Exceptional sound quality right away that continues to improve
- Capable of uncompressed dynamics at both loud and soft volumes, micro and macro, and doesn't harden or distort when playing loud
- Can handle big scale, orchestral, beautiful music to really raw, crazy metal music, all played convincingly at loud and soft levels
- New details are revealed without being hyper-analytical, sterile, or harsh
- Built like military materiel
Product Considerations
- Each monoblock weighs 145kg, so owners will welcome assistance when receiving it
- Inputs are on balanced XLR only, while the solid copper speaker terminals are designed for spade lugs, not 4mm bananas
- The Breguet watch dial-inspired meter's 'time-keeping' is less accurate
Takeaway: The D'Agostino Relentless 800 reproduces a wide range of music genres with detail and dynamics, offering an immersive and enjoyable listening experience. It brings out the best in music.
Video review
Our take on the brand
Our Summary
Product Strengths
- Delivers 800W of class-A power regardless of the speaker load
- Features XD technology that lowers output impedance, resulting in more control over the speaker drivers and improved soundstage depth
- Employs Sym-Max technology to significantly reduce second-order harmonic distortion, bringing out more detail and improving the sense of timing and pacing
- Has a power supply consisting of 5400VA of transformers and 188,000µF of filter capacitance for substantial power delivery
- Offers protection against excess direct current, short circuits, and voltage sags—brown outs
Product Considerations
- It may be too much power for some users
- High idle heat dissipation at 890 btu/hr per channel
Takeaway: The Krell KMA-i800 is a powerful amplifier with technologies that aim to provide a clean and controlled sound. Its high power output helps to improve sound quality even at average listening levels.
Video review
Our take on the brand
Our Summary
Product Strengths
- Designed to drive even very low-impedance loudspeakers without compromising distortion levels
- Delivers unmatched sound clarity and power with a maximum power output of 1050 watts RMS at 8 ohms and a total harmonic distortion (THD) of only 0.005% across 20 Hz to 20 kHz
- Features a damping factor of 600 at 1 kHz and output floor noise of less than 3 μV, delivering an impeccably clean and detailed sound free from unwanted background noise
- Ensures maximum thermal security and short-circuit protection with fully analog circuitry from input to output and an automatic shutdown feature
- Equipped with analog and digital inputs, including RCA and XLR connectors
Product Considerations
- A preamp is required to supply input switching and any processing needed before sending signals to the Telos 4800 to power the speakers
- As a mono power amp, two units are required for a stereo setup, increasing the overall cost significantly
Takeaway: The Telos 4800 is designed to meet the needs of any audio system and delivers unmatched sound clarity and power. With impeccable specs, it offers a high-end performance for audiophiles.
Video review
Our take on the brand
Our Summary
Product Strengths
- Crisp, tight rhythms are allied to a sonorous, close-focused view of vocals
- Capable of bags of detail and definition, while bathed in a lovely warmth
- Massive bass weight is available, with fabulous rosiny bite to the low strings, silky violins, and the feeling of space and air around the performers
- Big, substantial sound makes the most of remasters, bringing out all the character of vocals
- Focus and warmth contributes to a solid, three-dimensional soundstage, and remains clean and tight when cranked
Product Considerations
- The precious bottles should never be left unattended or used without the purpose-designed glass hood installed
- The amps' thermal characteristics may be a problem in a globally-warmed English summer
- Each amp draws 430W from the wall
Comparisons (according to reviewers)
- Vs Dan D'Agostino Relentless Monoblocks—the ERIC Encores are more expensive per watt
Takeaway: The Engström ERIC Encore Mono Power Amplifiers offer a captivating and enthralling presentation that challenges old clichés about valve amps. One should hear them if given the chance, for they sound glorious.
Video review
Our take on the brand
Our Summary
Video review
Our take on the brand
How to buy
Amplifiers
Search all hifi products
Explore our database of 10,000+ new and 25,000+ used hifi products.













































