Boulder 2150 Mono Power Amplifier

The 2150 Mono Power Amplifier is the beneficiary of 30 years of amplifier design. It replaces the renowned 2050 Mono Power Amplifier, a benchmark product that stayed in continuous production for almost 18 years.

Having the perfect template to build on, we analyzed, improved, and evolved the 2150 into something much greater than its predecessor. It outperforms it in every way and as a result earned Stereophile magazine’s Amplification Product of the Year award. After all, we don’t aspire to benchmarks. We outdo them.

Features

Boulder's most powerful continuously manufactured amplifier: 1000W into any load

Computer designed surface-mount circuit boards secured in custom-machined frames, each damped to eliminate mechanical distortion

Dual toroidal transformers, potted and installed in a welded steel enclosure: transformer hum is not permitted

Boulder Link for turn-on and turn-off of amplifiers and to send status messages to the display of any Boulder preamplifier

12V trigger connection for remote turn-on by most surround-sound processors and control systems

Two 99H2 gain stages (one for + audio and one for - audio), a third-generation descendent of the 990 gain stage used in recording and broadcast studios world-wide

Supervisor board monitors and controls all aspects of the amplifier's operating status

Dual gain stage design maximizes bandwidth by incorporating the majority of gain in the first stage

Designed as a fully-balanced, true monaural amplifier for ideal loudspeaker interface

Full Class-A biasing actively managed with an analog circuit that reduces heat and improves efficiency

Massive instant power delivery and damping from 80 bipolar output transistors

Dual speaker connections via easy to connect, high-current speaker terminals to accommodate bi-wired loudspeakers

Specifications

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

MAGNITUDE RESPONSE, 20 TO 20 KHZ

+0.00, -0.04 dB

MAGNITUDE RESPONSE, -3 DB AT

0.015 Hz, 200 kHz

VOLTAGE GAIN

26 dB

INPUT IMPEDANCE

Balanced: 200kΩ,

Unbalanced 100kΩ

COMMON MODE REJECTION (BALANCED ONLY)

60 Hz: 90 dB,

10 kHz: 70 dB

INPUTS

3-pin balanced XLR

OUTPUT CONNECTORS

2 sets of 6 mm / .250-inch wingscrews

WEIGHT

Amplifier: 220 lbs. (99.8 kg),

Shipping: 319 lbs. (144.7 kg)

POWER REQUIREMENTS

100, 110-120, 220-240 VAC, 50-60 Hz

250W nominal, 5000W at maximum output

AMPLIFIER TOPOLOGY

Pure Class A to full rated output