Simaudio 350P Analog Preamp/DAC - Complete And Like New

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The MOON 350P was a high-performance differential preamplifier.

Using circuitry derived from the Evolution Series, the 350P was a modular design that accepted optional plug-in modules: (i) a 24-bit/192kHz high-performance D/A converter with USB, optical (TosLink) and RCA (S/PDIF) inputs, and (ii) a configurable MC/MM Phono stage.

The MOON 350P's wide bandwidth and excellent dynamic range allowed it to effortlessly reproduce high-resolution audio. A well organized and thorough rear panel allowed for connectivity to virtually any audio component.

The 350P included a discrete headphone amplifier stage, allowing it to effortlessly drive the world's finest headphones.

An audiophile-grade product with a toroidal transformer-based large power supply, military-spec passive and active components, and state-of-the-art surface-mount manufacturing techniques helped make the MOON 350P the finest affordable MOON preamplifier to date.

In October 2012, the optional DAC's USB input was upgraded to 24-bit/192kHz performance and available for units manufactured prior to this date.

Technical aspects:

An oversized power supply using 2 toroidal transformers in conjunction with 3 stages of DC voltage regulation 7 line-level inputs (4 Single-ended & 2 balanced) including one front-mounted 1/8" mini-jack for personal media players

Discrete headphone amplifier circuit with the output on 1/4" TRS jack located on the front panel

One audio input which functions as a "pass-through", bypassing the gain stage to accommodate a component such as a home-theater processor, whose own volume control is used instead.

A full-function monitor loop Fixed (single-ended) and Variable (balanced & single-ended) line level outputs 12 Volt trigger output for remote operations

RS-232 port for (i) full unsolicited bidirectional feedback and (ii) firmware updates I

R input for external control SimLink™ controller port for 2-way communications with other compatible MOON components

A symmetrical circuit design

Rigid chassis construction to minimize the effects of external vibrations

Optimized selection of very high quality electronic components

Designed to be powered up at all times for optimal performance

Includes CRM-2 remote control

Our Testing Process for Preamplifiers at SkyFi:

We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage. Special attention is paid to the power supply which is the most common source of failure for preamps. We then power up the unit and run a simple 1k sine wave while monitoring the low voltage output on an oscilloscope for signs of distortion or noise to get a baseline.

At this point we will lubricate and clean all switches and potentiometers (that are not sealed) with a high quality contact cleaner, and then re-test all functions for any signs of noise or scratching.

Final testing involves putting actual music through the preamplifier We have learned over time that some issues are only noticeable to a trained ear while listening to a familiar source material. Our test bench has reference vintage Kef speakers that we are super familiar with which will quickly reveal any discrepancies. Some preamps will then move into the listening room where they will be tested with our in-house reference system.

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.