Boulder 2100 Series
World famous. World renowned. The Boulder 2100 Series continues to dominate high-performance audio.

2108 — Phono Preamplifier
• Three pairs of balanced inputs allow connection to three different turntable, tonearm, or cartridge combinations at the push of a button, without any reconfiguration
• Fully-balanced circuitry rejects noise and keeps the delicate signal from a phono cartridge in balanced mode, maintaining balanced operation throughout and eliminating noise that would otherwise obscure critical musical information
• Entirely separate power supply chassis houses four independent power supplies: left audio, right audio, control, and standby, for total isolation of all supplies from the sensitive analog audio circuitry
• Standard RIAA equalization as well as EMI, FFRR (London/Decca), and Columbia EQ selections enable proper playback of collectible records made prior to 1955
• Modular and discrete Boulder 995S phono gain stage is exclusive to the 2108, hand-manufactured and calibrated to spec in a potted and precision-machined housing
• Non-resonant and expertly machined casework protect the delicate analog signal from microphonic and resonant distortions
• Customizable Personality Cards for each input to match the exact individual needs of various phono cartridges: MM, MC, resistive and capacitive loading, high or low gain, and demagnetizing
• Switchable outboard demagnetizer pass-through connections for use with specific MC phono cartridges
• Front panel selectable, three-setting low-cut filter removes turntable rumble or low frequency noise from warped records
Specifications: 2108 Phono Preamplifier
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Inputs
Three pairs balanced,
converts to unbalanced
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Outputs
Two pairs balanced,
converts to unbalanced
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Input impedance (maximum)
MC: 1000 ohms
MM: 47k ohms
Resistive and capacitive loading adjustable on individual Personality Cards
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Output impedance
100 ohms balanced
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Phono equalization
RIAA,
FFRR (London/Decca),
EMI,
Columbia
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Maximum output level
28 Vrms
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Distortion, THD
0.005%
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1 kHz gain, RIAA
MC: 70 or 60 dB
MM: 50 or 40 dB
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Noise (EIN), MC
65 mV A-weighted, 105mV flat,
20 Hz to 20 kHz
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Frequency Response, 20 Hz to 20 kHz
RIAA: ±0.10 dB
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Crosstalk, L to R or R to L
-100 dB or better,
20 Hz to 20 kHz
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Phono preamplifier weight
37 lbs. (16.8 kg)
Shipping: 51 lbs. (23.2 kg)
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Power supply weight
48 lbs. (21.8 kg)
Shipping: 69.5 lbs. (31.6 kg)
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Power requirements
90-120V / 200-240V, 50-60 Hz
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Power consumption
75W maximum
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2110 — Preamplifier
• Balanced version of Boulder’s analog discrete step volume control is programmable for 0.1, 0.5, and 1.0 dB steps
• Four separate chassis: left audio, right audio, user interface, and power supply to isolate the analog channels from supply, control, and display noise
• Large, easy-to-read, dot matrix LED display
• Six pairs of programmable, differentially-balanced inputs
• Three pairs of balanced outputs for bi- and tri-amplified systems or powered subwoofers
• Cut mirror glass display window to match the hand-polished stainless steel buttons and volume control
• Separate power supply chassis houses three independent power supplies: analog left, analog right and control functions
• Every input can be custom named and configured for user preferences
• Auxiliary outputs are programmable to feed secondary systems or recording devices
• Uses 12 high-current output 993S gain stages, a discrete and modern version of the 990 gain stage used in broadcast and recording studios world-wide
• Boulder Link and 12V trigger for use with external control systems
• Each input can be configured for Theater Mode when used in home cinema installations
Specifications: 2110 Preamplifier
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Balanced Inputs
6 pairs of 3-pin XLR
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Main Balanced Outputs
3 pairs of 3-pin XLR
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AUX Balanced Outputs
1 pair of 3-pin XLR
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Maximum Input Level
7 Vrms
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Maximum Output Level
28 Vrms
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THD+N, 2V Output
from 20 Hz to 5kHz: 0.0008% (-102 dB)
at 20 kHz: 0.001% (-100 dB)
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Maximum Voltage Gain
20 dB
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Volume Range
100 dB
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Volume Steps
0.1, 0.5, 1.0 dB ± 0.01 dB
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Aux Path Gain
-1 dB
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Frequency Response, 20 Hz to 5 kHz
+0.00, -0.03 dB
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Frequency Response, -3 dB
0.02 Hz & 300 kHz
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Crosstalk, L to R or R to L
-134 dB or better, 20 Hz to 20 kHz
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Crosstalk, Adjacent Inputs
-134 dB or better, 20 Hz to 20 kHz
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Crosstalk, Main to AUX
-130 dB or better, 20 Hz to 20 kHz
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Input Impedance
333kΩ Balanced
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Output Impedance
100Ω Balanced
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Power Requirements
90-120V / 200-240V, 50 – 60 Hz
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Power Consumption
240W Max, 85W On (Idle), 500mW Standby
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Preamplifier Weight
63 lbs. (28.6 kg),
Shipping: 77 lbs. (34.9 kg)
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Power Supply Weight
48 lbs. (21.8 kg),
Shipping: 58.5 lbs. (26.5 kg)
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2120 — Digital-to-Analog Converter
• Large 12.3″ (31.2 cm), full-color, easy-to-read LCD display
• Decodes MP3, FLAC, xFLAC, WAV, xWAV, ALAC (Apple Lossless), AIFF, OGG Vorbis, and DSF (DSD 1x and DSD 2x) music files
• Supports all common digital data rates and resolutions
• Accepts streaming (USB and UPnP/DLNA Ethernet) and traditional (HDMI, Toslink, S/PDIF and AES3) digital input connections
• Artist, track name, album name, cover art and file type information is displayed when available during streaming
• Internal volume control for direct connection to amplification
• Plays online audio and video services such as Tidal, Spotify, Netflix or YouTube via HDMI inputs, including video throughput
• Four isolated chassis: left audio, right audio, user interface, and power supply
• Full selection of optional digital input modules can be chosen to fit any system needs
• Comprehensive function and display setup modes to tailor the 2120 to the user’s preferences
• Dual standby modes (normal and low power options) to meet all energy efficiency requirements
• Uses 20 fully-discrete 993S gain stages, a modern descendent of the 990 gain stage used in broadcast and recording studios world-wide
• Automatic software updates when linked to an active Internet connection
• IR remote and networked IP control for use in stand-alone systems or fully integrated homes
• Differentially balanced version of Boulder’s Precise Interval Clock to eliminate jitter and maintain ultra-precise data timing at the DACs
Specifications: 2120 Digital-to-Analog Converter
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Digital Inputs
HDMI, Ethernet (RJ45), USB 2.0, S/PDIF (RCA), AES3 (XLR), Tousling optical (EIAJ)
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Audio File Formats Supported
PCM, DSF (DSD 1x/2x), FLAC, xFLAC, WAV, xWAV, AIFF, Ogg Vorbis, MP3, ALAC
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PCM Sample Rates Supported (kHz)
32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384
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PCM Word Lengths Supported
16-bit through 32-bit
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Analog Outputs
2 pairs balanced XLR, adaptable to RCA
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Output Impedance
100 ohms (balanced), 50 ohms (unbalanced)
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Output Level
4.0V balanced, 2.0V unbalanced @ 0dBFS
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Volume Control Range
80 dB in 1.0 dB steps
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Display
12.3″ (32.25 cm), 1280 x 480 backlit LCD
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Internet/UPnP/DLNA
2 x RJ45 Ethernet connector
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Control Systems
IP, IR, 12V trigger out
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Signal-to-Noise Ratio
115 dB, 22-30 kHz, unweighted
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THD+N, 0dBFS
Less than 0.0008% to 20 kHz
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Frequency Response
-0.5 dB @20 kHz
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DAC Weight
63 lbs., shipping 77 lbs.
(28.6 kg, shipping 34.9 kg)
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Power Supply Weight
48 lbs., shipping 59 lbs.
(21.8 kg, shipping 26.8 kg)
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Power Requirements
100, 120, 240VAC, 50-60Hz
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2150 — Mono Power Amplifier
• 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: 2150 — Mono Power Amplifier
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Peak Power, 8 ohms
1000W
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Peak Power, 4 ohms
2000W
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Peak Power, 2 ohms
4000W
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THD, 8 ohms, 1000W
20-2 kHz: 0.0008%, 20 kHz: 0.0035%
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THD, 4 ohms, 1000W
20-2 kHz: 0.0009%, 20 kHz: 0.0045%
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THD, 2 ohms, 1000W
20-2 kHz: 0.0014%, 20 kHz: 0.0090%
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Frequency Response
-3dB @ 0.015 Hz, 200 kHz
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Equivalent Input Noise (EIN), 20 kHz BW
1.5 μV
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Magnitude Response, 20 to 20 kHz
+0.00, -0.04 dB
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Magnitude Response, -3 dB at
0.015 Hz, 200 kHz
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Voltage Gain
26 dB
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Input Impedance
Balanced: 200kΩ,
Unbalanced 100kΩ
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Common Mode Rejection (Balanced only)
60 Hz: 90 dB,
10 kHz: 70 dB
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Inputs
3-pin balanced XLR
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Output Connectors
2 sets of 6 mm / .250-inch wingscrews
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Weight
Amplifier: 220 lbs. (99.8 kg),
Shipping: 319 lbs. (144.7 kg)
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Power Requirements
100, 110-120, 220-240 VAC, 50-60 Hz
250W nominal, 5000W at maximum output
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Amplifier Topology
Pure Class A to full rated output
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2160 — Stereo Amplifier
• Bias operation is Class-A to full rated output power and managed with an analog circuit that minimizes heat and power consumption
• Boulder’s most powerful, continually produced stereo amplifier: 600W per channel
• Surface-mount circuit board design minimizes connection resistance and lead inductance
• Non-resonant chassis carved from solid blocks of aluminum on Boulder’s own CNC machining centers
• Four fully-discrete 99H2 gain stages, potted and housed in machined shells for thermal stability and shielding
• Two massive transformers are filtered, potted, and enclosed in a welded steel case
• Power cycling, turn on sequencing, and status messages sent to Boulder preamplifier displays via the Boulder Link communication system
• 12V trigger connection for remote turn-on and use with most surround sound processors and external control systems
• Supervising microprocessor circuitry controls and monitors protection systems, and the turn-on and turn-off of any linked amplifiers
• Dual stage design incorporates the majority of gain in the first stage to maximize bandwidth and minimize distortion
• Two pairs of speaker connections per channel to accommodate bi-wired loudspeakers
• Fully-balanced design from the inputs to the outputs substantially reduces distortion and noise
Specifications: 2160 Stereo Amplifier
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Peak Power, 8 ohms
600W
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Peak Power, 4 ohms
1200W
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Peak Power, 2 ohms
2400W
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THD, 8 ohms, 600W
20-2 kHz: 0.0008%, 20 kHz: 0.0040%
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THD, 4 ohms, 600W
20-2 kHz: 0.0012%, 20 kHz: 0.0065%
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THD, 2 ohms, 600W
20-2 kHz: 0.0018%, 20 kHz: 0.0100%
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Equivalent Input Noise (EIN), 20 kHz BW
1.5 μV
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Magnitude Response, 20 to 20 kHz
+0.00, -0.04 dB
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Magnitude Response, – 3 dB at
0.015 Hz, 200 kHz
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Voltage Gain
26 dB
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Input Impedance
Balanced: 200kΩ
Unbalanced: 100kΩ
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Common Mode Rejection (balanced only)
60 Hz: 90 dB,
10 kHz: 70 dB
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Inputs
3-pin balanced XLR
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Output Connectors
2 sets of 6 mm / .250-inch wingscrews
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Weight
Amplifier: 220 lbs. (99.8 kg)
Shipping: 319 lbs. (144.7 kg)
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Power Requirements
100, 110-120, 220, 240 VAC, 50-60 Hz
250W nominal, 5000W at maximum output
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Amplifier Topology
Pure Class A to full rated output
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