Source: Press Release, Last Accessed: 2021/10/30

Dan D’Agostino Master Audio Systems announced the Relentless Preamplifier, a companion model to the Relentless Mono Amplifier, which combines inventive power supply and audio circuitry, an elegant architecture, and a suite of innovative features.
The breadth of the Relentless Preamplifier design requires the use of three separate chassis – a dedicated audio chassis for each channel and a separate power supply centered between the two to keep the power supply feeds as short as possible. The three chassis interlock through special mechanisms in the mounting feet of each chassis. Thirty-pin interlocking, 20A-rated, gold plated connectors, eliminate wiring normally used for these applications. Positioned between the two audio channels, the power supply makes use of extensive electrical and magnetic shielding to keep radiated interference out of critical preamplifier circuits. Internal line conditioning circuitry filters RF noise on the AC power and compensates for asymmetric power waveforms and DC on the mains. Power for the preamplifier stages comes from two 150 VA toroidal transformer – one dedicated to the analog circuitry and one for the digital and control circuitry. The input stage in each mono preamplifier starts with a completely unique new discrete differential FET input stage featuring a voltage input signal capability of an extraordinary 30 volts. With an input impedance of over 1 MOhm, the Relentless Preamplifier’s front-end is immune to source related electrical issues, the company says. Featuring only balanced XLR inputs, the Relentless Preamplifier topology rejects common-mode input noise over an unusually wide bandwidth. All signal gain is realized in the current domain using proprietary multiple-output current mirrors with nearly 30 times the linearity of other designs. Utilizing no negative feedback anywhere, core D’Agostino circuit concepts include a signal path that is fully complementary, direct coupled, and balanced from input to output achieving a frequency response flat to 120 kHz. Arguably, the most striking element of the Relentless Preamplifier is the pair of volume controls fronting the two audio chassis. Each volume control is constructed using military-grade, high-linearity solid-state switches and discrete precision resistors. The Relentless Preamplifier is the first D’Agostino preamplifier to offer an optional DSM. This digital enhancement adds connectivity for legacy sources, USB functionality, and premier streaming capability. Field upgradeable, the DSM adds SPDIF coaxial, Optical, USB-A, and RJ-45 and Wi-Fi network inputs, supporting PCM signals up to 32 bit/384 kHz and DSD signals up to DSD256 (11.2MHz). For latency free playback of high-resolution network content, 10/100/1000 Gigabit Ethernet is supported. Relentless Preamplifier is, also, Roon ready.

For more information: https://dandagostino.com/

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