Reviews Pura Ammonite dual network switch made in Holland

The trend is unstoppable: network adapters have become an essential part of audio after the boom in broadcasting. Acceptance also begins to grow and one realizes that data is not made up of 1s and 0s, but an analog signal that needs to be transmitted. Unfortunately, variable voltage is often required common mode noise It contains annoying high-frequency noises that negatively affect basic equipment. Wi-Fi and electrical isolation help prevent transmission of HF noise and prevent unwanted ground connections, but cause problems in other areas. For now, perhaps the best solution is to use a dedicated audio network switch just before the player, en route to the best musical score.

Pura Ammonite

Example does not honor a prophet in his own country. Let’s step away from that and look at the result of the efforts of Miquel Blauw (Dion Audio) and Koen Gelderman (Purecable), who launched Pura Power Supply in 2021 as a collaboration. Resulting from the development of energy sources for private use. The spin-off is the manufacture of an internally developed dual network switch called The Ammonite.

In and with network adapters, a few things have been proven so far: the usefulness of a really good power supply, daisy-chaining switches, and removing all other equipment except the streaming device on the switch. Opinions in professional circles are deeply divided as to the usefulness of a very good watch in the switch, the fuse used and the power cord. Pura has therefore prepared a basic model which can be modified in a few points at the customer’s discretion.


Those like the undersigned who can’t resist peering inside the sleek and meticulously fitted Ammonite case will be the first to be stunned by the large toroidal adapter used by Pura. A medical grade – The type with its own fixed screen, connected to the main entrance and to the Furutech fuse holder. Used to power two internal Dodo power supplies. Each power supply performs a different task: one power supply is used for the two on-board switches, the second power supply is optimized for the digital clock, and the slightly bright green LED sits on the front of the Ammonite. The adapter you have on the OCXO module has a separate circuit board. The model with the TCXO oscillator is more economical, in both versions the clock controls the 5-port switches, so synchronization is ensured.

The two switches share only the chassis, power source, and clock, and they are independent of each other. These are 100Mbps models, fast enough to transfer data to a streaming device, in fact the realization that a connection above 100Mbps is better than 1Gbps is slowly starting to emerge. The upper switch is for LAN and/or NAS connection and/or other devices, and the lower switch is for the network operator. A short cable with switches connects through the Ethernet ports. So you have four free ports above and only one below. Therefore, Ammonite is clearly intended to be the carrier’s last switch and not to be placed somewhere in the network where it will carry other traffic. By applying two switches internally, the ultra-low noise of the power supply is greatly reduced.

Zooming in on the Dodo we find a very precise power supply with very low subjective noise. Ideal for switches and when purchased separately Ideal for routers, network drives and D/A switches, each of which can suffer from common mode noise transmitted over Ethernet connections. Digital oscillators in the form of OCXOs and TCXOs particularly benefit from less interference and, as you know, each digital device relies on its own digital clock. The Dodo power supply will not behave differently if it is more or less charged. The voltage will not drop or carry more noise. This is the speed of the power supply, which is constructed using Nichicon and Panasonic Audio Grade Low ESR capacitors, high frequency PPS split capacitors and Schottky rectifier diodes.

Unlike the ideal amount of buffer in capacitors, Pura chooses a small integer value to make the power supply fast. On the Pura website, there is a good comparison between the very large quantity of coils and the good quantity.

Ammonite comes standard with a Ceramic Fuse, and for an additional cost you can choose a Hifi Tuning Supreme 3 Fuse or a Synergistic Seek Buff. With Pura The Ammonite, no more power cord or Ethernet cable to go to your operator, your choice is free. Besides that, Purecable has enough models available and every audiophile has their preferences. The ammonite consumes about 10 watts, measures 295 x 140 x 50 mm and weighs 3.3 kg. The case color is black. Ammonite prices start at around $1,300 for a TCXO watch and ceramic fuse. It amounts to around 1,950 euros for an OCXO watch and a Synergy fuse. The copy sent to us is worth around 1,800 euros with a ceramic fuse and an OCXO.


Suffice it to say: Ammonite is a well thought out switch with great performance, maybe not enough. This is the main result of the various hearings spread over several days. Switching between different switches is done by switching the LAN cable and the Ethernet cable to the network operator. This change takes a while, so to ensure my findings are accurate, I only change every other day and not always for every track. The result is therefore based on playing a lot of music. Among them, Angelina Wesmais for her poem by the French singer Barbara, and the collaboration between Pat Metheny and Anna Maria Jobbic on “Upojnie” and Diana Reeves with “That day”. Classical work by composers such as Händel, Bach, Vivaldi, Scandinavian jazz and all with a little pop.

In almost every way, Ammonite is the mid-range engine between the Melco described below and the Silent Angel. For example, the acoustic impression that Ammonite leaves is much brighter than what Bonn can provide and darker in nature than Melco. The same goes for the stereo image, although The Ammonite manages to add a lot of depth, at the cost of some width. Image height is correct. Even the detail applied to the screen is a little below Melco’s level (with an improved power supply).

Once you listen to The Ammonite, you’ll notice there’s a lull in breeding. Listening to music is comfortable and not difficult. Never “digital”, never tired, even after hours of listening (what a boring job, right?). The music remains playful and beautifully balanced in terms of sonic balance. The reproduction brings calm and emphasizes the music itself, so you should be drawn to the lesson every time. Because it’s not just about having fun, it’s also about listening to what happens when you breed.

The emphasis is on the soloists, and the instrument and voice mode does not move in stereo unless recorded in the recording. Low notes are strong, while notes on the double bass are easily perceptible in pitch. The piano playing is clear and powerful, and the crisp tones come out all the way. The soft voices of women can be sensual and convincing. The guys come out of the speakers with deep chest bass. The music played is played as easily as a singer/songwriter with just a guitar or piano. In short, the Ammonite does the right thing and does it perfectly.

Total picture

Listen to a set that begins with a Silent Angel Bonn N8 switcher with Forester F1 power supply, interspersed with a Melco S100-BB switcher with acoustic power supply. Behind it is an Auralic Aries G1 transmitter and a Metrum Acoustics Adagio Level 3 transducer. The woofer is an EAR-Yoshino 8L6 with Falcon LS3/5a Gold Badge woofers. The tweeters are on designer supports with IsoAcoustic dampers. AudioQuest Niagara 3000 network filter and Furutech NCF Clear Line.

Power cords are all AudioQuest, AES/EBU is Ricable Digital Link, and analog link cables and amplifiers are In-acoustic AIR. The Linksys Switch was briefly and thoroughly used with an iFi power supply, but it’s no longer suitable for serious listening. Oh yes, the Ethernet cables are all AudioQuest Vodka except for the looped cable from Pura itself. Music played comes from our own collection, via Roon software running on NUC, from Melco storage.

proven benefit

Network switches, the debate remains as to whether and what is their usefulness. Not for me, years and years ago I did notice audible differences, but there were no ethernet adapters really designed for audio. After all, the show was still in its infancy and only took off later. Luckily the differences have been recognized and as a result there is now a decent choice, from a regular switch with better power to off-the-shelf products like Pura The Ammonite. Built from the philosophy of power and cable, plus exclusive Purecable and Dion Audio products. Key will surely take its place among the growing competition if buyers trust Dutch merchandise. And why not, there is more beauty coming out of our country than many people realize.

The ammonite forms a nice bridge between the cheaper and more expensive part. It works accordingly and can be supplied in different forms. The clock oscillator and valves are your choice, and the cables come in your favorite or from Purecable. Inside, the Switch is built with beautiful components, with careful attention to where the focus is: tackling common position noise and grounding issues. This is ensured by a static shielded transformer, dual power supply and pure clock generator as well as separate switches for network and actuator.

It’s the end product of what many have called the requirements on the forums and Facebook. How easy it is to go to Pura and buy a finished product. With a guarantee from the Netherlands to a reliable address. Count on a serious screen improvement if you’re still using a cheap computer switcher and count on an improvement if you’ve already taken a (small or medium) step.

Behind the pleasant network operator, there should be a switch that does not carry its own noise, emphasizes the good qualities of the network operator in the system and provides peace of mind. To keep the music flowing and captivating. The ammonite is there for that.

Pura Ammonite
€1299.54 to €1957.78

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