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432 EVO – Aeon Music Server

From £5,000.00

The 432 EVO Aeon is the server directly below the top of the line Master model. The Aeon shares several features with the flagship model and is at a more affordable price point. Even so, it easily surpasses many  other similarly priced digital sources, sounding closer to high end analogue with no hint of digital harshness. The Aeon can be upgraded later to the Master. 

The Aeon was developed from the 432 EVO High-End model, taking the design further. It shares the dual power supply setup from Sbooster, but with a high quality SOtM superclock board for optimised USB output. The Aeon also has additional core specific software tuning to minimize jitter, and all audio processing now runs on a dedicated core.

The Aeon runs full Roon or Logitech Media Server and the sublime 432 Hz enabled player, which can also play bit perfect to the highest possible quality. It also features a bit perfect Teac CD drive for ripping your CD collection.


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  • Similar to MASTER but with 2 x Sbooster BotW mk2 linear supplies, one for server and one for usb+superclock.
  • Can be upgraded to MASTER later.



432 EVO uses a custom realtime Linux OS tuned for ultra low software jitter and reduced entropy.

Solidstate Drive

The 432 EVO can be optionally be ordered with single or dual noise filtered audio grade SSD’s, leading to a 100% silent solution. Can be ordered with 2 TB, 4 TB or 8 TB of total SSD storage.

HD Storage

The 432 EVO Aeon comes has a 2TB low noise hybrid storage on a custom spring suspension system combining the best aspects of HDD’s and SSD’s in a single drive. Full SSD’s are also possible.

Bit Perfect Ripper

The bit perfect Teac rip drive is hand tested and compared against test CD’s for perfect operation.

Hardware Boost

HW Boost is a paid for upgrade within Europe. However in the UK it is provided as standard. ROON can be power hungry, and to ensure larger libraries are not throttled, a faster CPU & Clock are fitted. In addition, Random Access Memory (RAM) is doubled ensuring the slickest operation and experience of ROON possible

USB DAC output

The ultra low noise USB DAC output is a dedicated audiophile output board independent of the main board’s USB ports, no USB hubs are used.

Super Clock

The Aeon does not reclock the ultra low noise USB output, but clocks it directly with a dedicated super clock board.

USB Tuning

As no hubs are used, the audiophile USB output is controlled in Linux and custom tuned to get the highest realtime priority.


432 Hz tuning

432 Hz is one of the ways to tune musical instruments, and is also known as the Tuning Note “A” and A = 432. Music tuned to 432 Hz sounds better than contemporary music which is tuned at A = 440. The famous Stradivarius for example was tuned to 432 Hz according to the Verdi tuning

During historical periods when instrumental music rose in prominence (relative to the voice), there was a continuous tendency for pitch levels to rise, also known as the pitch inflation. A higher pitch such as the current A = 440 standard sounds sharper, louder and more “fresh”, but also more aggressive, which is not a quality audiophiles are looking for.

The 432 EVO offer you the possibility to convert your existing music on the fly into the better sounding 432 Hz, without any resolution loss. Several best of show awards we have won are the ultimate proof, and recent research by Maria Renold and a group of 2000 people showed that 90% preferred 432 Hz.

For purists we still offer bit perfect mode on par with the best CD transports, or upsample only mode for those who want to tune the sound. All these modes are live switchable.

Dedicated Core

The 432 EVO Aeon incorporates a modern power efficient Quad Core CPU with 4 or 8 GB of RAM (8 GB RAM when HWBOOST is selected as option).

 We implement many techniques from the supercomputing world inside the Aeon to guarantee a stellar audio performance: the audio decoders and 432 Hz processing run on a dedicated core, and will never run out of CPU cycles or have to fight with other processes. The dedicated audio core runs a custom clock scheduler which doesn’t interrupt the critical audio processes at 1000 times per second, greatly improving software jitter, as process switching is minimized.

The Aeon also eliminates typical “chaos” found inside the OS of many other servers by using advanced kernel & process tuning configurations not found in any competing product, further lowering software jitter by reducing entropy. This is a remarkable achievement and key to it’s stellar performance.

Using custom BIOS and kernel tuning, the EVO actually shuts down chip functionality on the motherboard, so it acts like a software defined custom motherboard. The big advantage of this approach is that the Aeon is future proof. If faster and/or better sounding main boards become available, the customer will be able to upgrade. We already offer this to existing customers.

We use a custom realtime Linux OS, refined and tuned by 432 EVO’s owner Frederic Vanden Poel, who is also a senior Linux consultant building with 20+ years of IT experience. The EVO can be on 24/7 and will never run hot, always running cool while sounding analog and very refined.

Dual SBooster External Power Supplies

The importance of a pure and clean power supply for digital audio cannot be stressed enough. Digital audio’s enemy is noise, and much of that comes from poorly designed power supplies or cheap SMPS (switched mode power supplies). In fact a dirty power supply can not only ruin the sonic performance of a server, it can also inject noise down the mains to infect the rest of your system!

We thus take the specifications of our power supplies extremely seriously. The Aeon has a true double independent power supply. Instead of offering several of dependent DC rails from one transformer, each of the bundled power supplies with the Aeon has a separate AC filter, torodial transformer and dual stage DC buffering.

The second part of the DC buffer is attached to each power supply, leading to a very short current paths towards the dedicated USB output board and superclock board of just a few centimeters. The “IT” parts inside the server also have their own dedicated power supply, with DC filtering between storage and main board, acting as a noise firewall for the moving parts inside HDD’s, or the PWM converters in SSD’s. As we use 2.5 inch  drives, the electrical & mechanical noise is already drastically lower compared to normal consumer drives.

Using a dual design with 2 external transformers leads to much faster transients compared to a single shared transformer. Both power supplies are also free of any transformer noise.


Audio Outputs

  • Digital output
    • Superclock based dedicated USB 3.0 output supporting USB Audio Class 2.0 to connect to your USB DAC
    • Network streaming with realtime scheduling to any Roon endpoint and Logitech / Squeezebox based players


  • Ethernet
    • 1x RJ45 for realtime clocked gigabit supporting true gigabit ethernet ISP’s
  • USB
    • 1x ultra high-end low jitter superclock based USB DAC output
    • 2x USB 3.0 ports for backup or connecting additional USB dac’s
    • 2x USB 2.0 ports for connecting additional USB dac’s
  • HDMI
    • HDMI port supporting HDMI dac’s and surround processors / receivers
  • KVM
    • VGA, DVI, HDMI and keyboard/mouse service ports normally never needed as the EVO is VPN supported
  • Grounding terminal
    • Optional grounding terminal supporting bare wire, banana and spades can be purchased when ordering your 432 EVO, to connect grounding cables and grounding boxes, or to create a direct grounding path between your EVO and DAC

Open File Formats

  • Logitech Media Server
    • All common formats including DSD, WAV, flac, MP3, ogg vorbis, aac, … Passthrough of MQA
  • Roon
    • MP3, WAV, WAV64, AIFF, FLAC, Apple Lossless, OGG, and AAC at resolutions up to 32 bit 768kHz. Roon also supports DSD64, DSD128, DSD256, and DSD512 in the DSF and DFF formats.

DRM File Format

  • Logitech Media Server
    • Ogg Vorbis as supported by Spotify Passthrough of MQA towards MQA DAC when using bitperfect mode
  • Roon
    • MQA first unfold supported & any MQA feature in Roon As MQA does not recover any new audio data in the second unfold, second unfold can be replaced by 432 EVO’s own upsample which also can support minimum phase rendering with one cycle of post-ringing, or the superior sounding Archimago minimum phase filter.

Audio Transformations

  • Bitperfect mode
    • No audio transformations occur, unless DAC does not support sample rate or bit depth of format, otherwise true bitperfect matching or even beating the most exclusive CD transports
  • Upsampling-only
    • Output most DSD & PCM formats in any input samplerate as 24 bit or 32 bit output in one of the following output samplerate:
      44.1K, 88.2K, 176.4K, 352.8K and DXD, 706.6K
      48K, 96K, 192K, 384K, 768K
  • 432 Hz mode
    • Same as upsampling mode, but with 432 Hz processing without resolution loss. 432 Hz and upsampling are a combined one step algorithm, therefore no additional load is caused on the CPU when using 432 Hz mode compared to upsampling

Supported Tuning Transformations Using 432 Hz Mode

  • Input pitch
    • 440 Hz up to 445 Hz in one step increments
      Other pitches can be added by special request
  • Output pitch
    • 415 Hz
    • 426 Hz
    • 430.5 Hz (Equal Tone Temperament)
    • 432 Hz (Verdi’s A, Pythagorean Temperament)
    • 440 Hz (today’s Concert Pitch) → used for upsample-only mode
    • 444 Hz
  • Supported input formats
    • Any audio and file format from local files on the internal storage on the EVO or a NAS, internet radio, on demand streaming services such.
    • 444 Hz mode not compatible with live internet radio

Upsampling Recipes

For Upsampling-Only And 432 Hz Modes

  • Linear phase
    • User tunable linear phase filter, including tuning of processing buffer size and several precision options. All frequencies have the same delay through the filter.
  • Minimum phase
    • User tunable minimum phase filter, including tuning of processing buffer size and several precision options. No pre-ringing.
      Post-ringing can be regular long tail “minimum-phase” without aliasing, or reduced MQA / Ayre inspired one cycle of post-ringing with free bonus aliasing, create pseudo ultrasonics.
  • Intermediate phase
    • The only server on the market supporting Archimago’s Intermedia Phase upsampling, the most ideal filter with mainly post-ringing and no phase issues within the audible range.
      432 EVO implements his original recipe, and two improved variants of this filter

Audio Sample Rates

  • Sample rates
    • All common multiples of 44.1 and 48K
    • All common DSD formats
  • Bit depths
    • 16, 24 and 32 bit

Control Apps

  • Roon
    • Official Roon remote running on Apple or Android tablets & phones
      Desktop version of Roon for PC or MAC acting as a Roon remote control
  • Logitech Media Server
    • Any web browser for web based version of GUI
    • SqueezePad (iPad)
    • iPeng (iPhone/iPad)
    • Orange Squeeze (Android)
    • Squeezer (Android)
    • Squeeze Remote (Windows)

Configuration Interface

  • Web Gui
    • Web interface usable on any phone, tablet, laptop or desktop:
    • 1. Configure the 432 Hz enabled player
    • 2. Check the riplogs
    • 3. Switch between Roon & Logitech Media Server
    • 4. Several other system configuration parameters not often changed


  • Ripdrive
    • Hand tested Teac slot-loading, tested with at least 5 retail CD’s which are known to cause rip issues on some drives. All CD’s must past our extreme test.
  • Default storage
    • Ultra low noise laptop 2 TB SSHD (hybrid HDD+SSD) on spring suspension system, with SATA noise filtering and SATA protocol tuning for lower EMI
  •  Storage upgrades
    • Optional 4 TB SSD or 2x 4 TB SSD merged as a virtual 8 TB instead of 4 TB HDD is possible. Please enquire for pricing.
  • CPU
    • Model with HWBOOST: J4205 tuned to a more constant power draw for lower software jitter. 
More modern and faster than many competitors who use the old N4200

Model. Without HWBOOST: non-disclosed quad core CPU slightly slower than the J4205, but still fast enough for Roon
  •  Memory
    • 8 GB, plenty enough for Roon even when importing larger collections

Supported Streaming Services

  • Roon
    • Internet radio, Qobuz and Tidal
  • Logitech Media Server
    • Internet radio, Qobuz, Tidal, Spotify and any service for which an LMS plugin is available


  • Mains supply
    • 100 Volt AC 50/60Hz / 110 Volt AC 50/60Hz
115 Volt AC 50/60Hz / 120 Volt AC 50/60Hz
220 Volt AC 50/60Hz / 230 Volt AC 50/60Hz
240 Volt AC 50/60Hz
    • True dual linear power supplies
  •  Internet
    • Internet connection required for updates, VPN support & metadata retrieval.
    • Can work standalone (e.g. hifi shows, shows on location) with just a
    • Wi-Fi router attached via ethernet and no active internet connection
    • To use the superclock based USB output, you’ll need a USB dac conforming to USB Class Audio 2.0 standard (most DAC’s follow this standard)
  • Network endpoint
    • To stream to endpoints, you’ll need Roon or Squeezebox compatible endpoints


  • Colour
    • Black or Silver
  • Weight
    • PSU 1.85 KG x2
    • Server 5 KG
  • Dimensions
    • PSU 240 x 130 x 75 (each) (W x D x H, 69mm including feet)
    • Server 435 x 325 x 60mm (W x D x H, 69mm including feet)
  • What’s in the box
    • Server
    • Dual PSU each with DC cable
    • Manuals & Quickguide
  • Chassis
    • Modular chassis which will support future hardware updates such as new mainboards as they come to market

Warranty & Remote Support

  • 2 years limited warranty
  • 2 years VPN support included with the 432 EVO


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