Dan D’Agostino Relentless Preamplifier


The Dan D’Agostino Relentless Preamplifier sets a new standard in preamplifier design, focusing on preserving the integrity of the music signal in a susceptible stage of audio reproduction. This preamplifier is distinguished by its innovative use of three chassis, dedicated to each channel and separated by a power supply/control section, effectively mitigating noise and distortion.

Key Features:

  1. Advanced Power Supply: Positioned between the audio channels, the power supply utilizes extensive shielding to prevent radiated interference from affecting critical preamplifier circuits. It includes line conditioning circuitry to filter RF noise and compensate for power waveform irregularities.
  2. Robust Power Delivery: The preamplifier benefits from two 150 VA toroidal transformers, one dedicated to analog circuitry and one for digital and control circuitry. These transformers drive a bridge rectifier and substantial filter capacitance, providing ample power supply capability.
  3. Innovative Input Stage: The Relentless Preamplifier introduces a new discrete differential FET input stage with an impressive voltage input signal capacity of 30 volts. This design ensures immunity to source-related electrical issues and features a unique circuit to maintain stable bias levels.
  4. Balanced XLR Inputs: The preamplifier exclusively features balanced XLR inputs, effectively rejecting common-mode input noise over an extensive bandwidth. Signal gain is achieved in the current domain using proprietary multiple-output contemporary mirrors, ensuring exceptional linearity.
  5. Comprehensive Isolation: Analog and digital circuit elements, including ground planes, are isolated. Digital control signals are optically coupled to analog circuits, and signal-switching relays utilize hermetically sealed, gold-plated contacts for maximum integrity.
  6. Dual Volume Controls: The most striking feature is the pair of volume controls for each audio chassis. Constructed with meticulous attention to detail, they ensure smooth control with high-linearity solid-state switches and discrete precision resistors, maintaining consistent bandwidth and transient response.
  7. Two Source/Two Zone Capability: The Relentless Preamplifier allows simultaneous switching and volume control for two sources in separate rooms or zones. This versatile capability adds flexibility to your audio setup.
  8. Elegant Remote Control: Housed in machined aluminum and copper, the remote control features a touchpad interface with Bluetooth 5.0 technology for extended range and bi-directional functionality, reflecting adjustments made on the front panel.
  9. Optional Digital Streaming Module (DSM): This module adds connectivity for legacy sources, USB functionality, and premier streaming capabilities, supporting high-resolution network content and offering compatibility with subscription streaming services.
  10. Integration Features: The preamplifier is designed for ultimate stereo playback but can also integrate seamlessly into home theater systems with a Theater Bypass mode. It includes RS-232 and 12 Volt triggers for integrating advanced home control systems.


  • Frequency Response: 0.1 Hz to 120 kHz, +/- 0.0 dB
  • Signal-to-Noise Ratio: -105 dB, unweighted / -100 dB, weighted
  • Gain: +8/+14dB selectable
  • Total Harmonic Distortion: < 0.006%, 20Hz to 20kHz
  • Inputs: 5 pairs balanced via XLR connectors
  • Outputs: 2 pairs balanced via XLR connector for Zone 1, 1 pair balanced via XLR
  • Dimensions (Preamplifier): 17 x 1.75 x 17 in / 43.2 x 34.9 x 43.2 cm
  • Dimensions (Power Supply/Base): 17 x 3.9 x 17 in / 43.2 x 9.9 x 43.2 cm
  • Weight: 132 lb / 60 kg

The Dan D’Agostino Relentless Preamplifier is a pinnacle of audio engineering, delivering unrivaled performance and precision in preamplification. Its meticulous design and innovative features make it an exceptional centerpiece for the ultimate music system.


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