Dan D’Agostino Momentum C2 / C2Z Preamplifier

A Bold New Concept

The Momentum C2 - short for Concept 2 - represents a significant advancement beyond its predecessor, the acclaimed Momentum HD Preamplifier. It introduces an entirely new architecture, built around a complementary four-circuit topology inspired by the flagship Relentless Preamplifier, along with comprehensive innovations spanning the input stage, power supply, and an optional Digital Streaming Module. Together, these elements place the Momentum C2 in a class of its own.

Building on this foundation, the Momentum C2Z extends the C2 platform to fully complement the latest generation of Momentum Z power amplifiers. While the C2 and C2Z share the same core design, features, and operation, the C2Z incorporates a FET-based output stage capable of delivering substantially greater current. This enhancement is specifically engineered to match the Z input stage introduced in the Momentum Z amplifiers, creating a highly synergistic interface in which the preamplifier can deliver increased current and the amplifier is designed to receive and utilize it with maximum efficiency.

The choice between the two models is therefore straightforward: the Momentum C2Z is the ideal partner for amplifiers equipped with a Z input stage, while the Momentum C2 remains the reference for all other applications. Operationally, both preamplifiers perform identically, differing only in their optimized output stage design.

Complementary Four-Circuit Topology

At the heart of the Momentum C2 / C2Z Preamplifier lies Dan D’Agostino’s revolutionary complementary four-circuit topology. This unique input stage circuitry sets a new standard for performance and precision, delivering unparalleled clarity and fidelity to the audio experience. Utmost attention to design detail ensures optimal mechanical and electrical isolation, guaranteeing pristine signal integrity throughout the critical preamplification stage. 

Unrivaled Audio Circuitry

Building on the legacy of the Momentum HD Preamplifier, the Momentum C2 / C2Z topology utilizes an array of four JFET transistors in a complementary, differential, push-pull arrangement, dramatically increasing input impedance and reducing noise. Its unique, discrete dual-complementary differential JFET input stage achieves exceptional performance and stability in every system configuration. 

For less-than-audiophile-grade recordings, transformative tone-control circuitry remains entirely transparent in its operation, ensuring zero impact on the signal path when inactive. Concealed behind a discreet door on the front panel, a headphone jack featuring independent amplifier circuitry opens the world of private listening at the most refined level. 

Unmatched Power Supply

The enhanced dynamics and power delivery of the Momentum C2 / C2Z Preamplifier are a product of an advanced power supply, housed in a separate chassis for maximum isolation, and powering the audio chassis through a 20-amp interlocking connector. The power supply features individual custom toroidal transformers dedicated to analog and digital circuitry, respectively, with internal circuitry addressing RF noise and powerline irregularities.

Digital Streaming Module (DSM)

The Momentum C2 / C2Z Preamplifier offers an optional DSM that adds connectivity for legacy sources, USB functionality, and premier streaming capability. Field upgradeable, the DSM adds SPDIF coaxial, optical, USB-B, RJ45, and Wi-Fi network inputs. For latency-free playback of high-resolution network content,10/100/1000 Gigabit Ethernet is supported.

Tailored iOS apps facilitate effortless control of music collections, streaming content, and unit functions. Native integration with subscription streaming services like Tidal, Qobuz, and Spotify is supported within the app, with additional compatibility for Tidal Connect. Furthermore, with appropriately encoded files, standard MQA decoding is enabled. For users who prefer alternative music management, Roon Ready certification will also be available. 

Capable of handling today’s highest resolution sources, the DSM natively decodes PCM signals up to 32 bit/384kHz and DSD signals up to DSD256 (11.2 MHz).

Often overlooked or downplayed, the analog section of a DAC significantly impacts the final sonic performance of digital music. Internal balanced connections carry the final analog signal directly to the input circuitry. From here, the analog music signal takes advantage of the entire power and analog circuitry within the Momentum C2 / C2Z Preamplifier. 

Advanced Control

Created with precision and elegance in mind, the Momentum C2 / C2Z Preamplifier expresses a sleek and sophisticated design. The included bi-directional remote control, housed in precision-machined aluminum and Delrin®, offers intuitive control over unit functions and settings. With its ergonomic design and LCD screen, the remote provides a seamless user experience, mirroring information from the preamplifier’s front panel display. 

Coupling innovative circuitry with unparalleled design, the Momentum C2 / C2Z Preamplifier becomes the centerpiece of the most ambitious music systems.

Frequency Response

Signal-to-Noise Ratio

Gain

Input Impedance

Output Impedance

Distortion (full output):

Analog Inputs

Digital Inputs (w/optional DSM)

Outputs

Control Protocol

Dimensions (WHD)

Weight

Finish

• 1- Balance XLR Analog Source Input 1-3 Selector Buttons
• 2- Single-ended RCA Analog Source Selector Button
• 3- Standby/Power On Button
• 4- Headphone Selector Button
• 5- Mute Button
• 6- Tone Control Selector Button
• 7- Multi-Purpose Display
• 8- Power Supply Chasis
• 9- Headphone Input Jack (Behind Sliding Logo Door)
• 10- Digital Source Selector Buttons
• 11- Tone Controls
• 12- Volume Control Knob

• 1- Option Digital Streaming Module with SPDIF, Ethernet, Optical, USB, and Wi-Fi antenna connections
• 2- IEC AC Power Socket
• 3- AC Power Switch
• 4- Bluetooth Antenna
• 5- RS-232 Control Connector
• 6- 12-volt Trigger Output Jacks
• 7- Balanced XLR Output Jacks
• 8- Single-ended RCA Input Jacks
• 9- Balanced XLR Input Jacks