Eno2

This review first appeared in October 2025 on fairaudio.de. By request of the manufacturer and permission of the author, it is hereby syndicated from the German original to reach a broader English audience. Ed.

Reviewer: Ralph Werner
Analog sources: Drive: SME Model 15 Tonearm: SME 309 Cartridge: MC: Denon DL-103R, Dynavector DV-20X2 H, Transrotor Figaro; MM: Shelter 201 Other: Flux-HiFi (stylus cleaner), Stack Audio Serene Mat & Stabiliser, VPI HW-16.5 (record washer)
Digital Sources: D/A Converter: Rockna Wavelight+ Music Server: Antipodes K22 G4 Other: Network Acoustics Eno2 (Ethernet Filter), Pink Faun LAN Isolator, Silent Angel Bonn N8 (Switch)
Preamplifiers: Line level: Electrocompaniet EC 4.8 MKII Phono amplifier: BMC Audio MCCI Signature ULN
Power amplifiers: Electrocompaniet AW 800 M
Speaker: Acapella High BassoNobile MK2
Headphones: Audeze LCD-2, Beyerdynamic DT-990, Sennheiser HD 800 S, Sony MDR-1000X, Teufel Supreme In
All-In-One: Ruark Audio R4
Cables: Speaker cable: Dyrholm Audio Phoenix, fis Audio Studioline NF cable: Dyrholm Audio Phoenix XLR, Boaacoustic Blueberry Signal.xlr, fis Audio Livetime (RCA), Vovox and others Digital cables: Audioquest Cinnamon (Toslink), Audioquest Vodka 48 (HDMI/I2S), Boaacoustic Silver Digital Xeno (USB), fis Audio Magic (LAN cable), Wireworld Series 7 Starlight Gold (S/PDIF coaxial) Power cable: fis Audio Blackmagic, fis Audio Studioline Power strip: fis Audio Blackmagic
Rack: Creaktiv Trend 3 (rack) standing on bFly Audio b.DISC (spike mounts), Stack Audio Auva EQ (device decoupling feet)
Accessories: Power filter: Audes ST-3000 Power Conditioner (isolation transformer)
Size of the listening room: Floor area: 40 m² Height: 2.45m
Review component retail: €1'395

Truly great? Audiophiles complicate everything. Playing a record becomes a quasi ceremonial ritual. Nearly instinctively they found and continue to find ways to turn the otherwise easy subject of streaming audio into a hardware-intense cluster funk. Hence high-end switches, LAN cables, reclockers and such are on a quickly proliferating ascendant. However, I must speak up for our extremist kind. When network tech and the internet were invented, nobody asked us whether it would sound any good. So now we're in a pickle. The stuff hisses and jitters. Little good can come from it. I actually consider my personal digital setup fairly down to earth. Yet opinions on that (cough) diverge. When I tell the people who can't decipher the three letters "DAC" about different LAN cables, power supplies and sound-optimized router settings, they start to speak to me very slowly as though I'd fried my brain. Well, what the heck. Those soft-in-the-ear people probably won't be interested in the latest device that crept into my rig, the Eno2 Ethernet filter from Network Acoustics. But since you're here, you just might.

Network Acoustics are a young British company based in Eastleigh about two hours southeast of the big smoke of London. Apparently they've heard of us. We certainly heard of them. CM Audio's Torsten Fink praises their kit. Since he has a keen nose for digital audio (Antipodes Audio, Ideon Audio among others), we thought there might be something to these tuning products from the UK. So we quickly contacted them and just a few days later, the product that started it all for them arrived – in its current second edition called Eno2.

The palm-sized box is passive which retires the neurotic question of whether its power supply will meet audiophile standards. There is no power supply. Operation isn't complex either. The LAN cable coming from the router or switch plugs into the RJ45 socket labelled "IN", the outgoing link to the streamer/music server/streaming DAC into the "OUT" socket. That's it. I like that the last LAN 'metre' includes; and not as an Electric Avenue throwaway. This is an in-house production which separately sells for €1'150/1.5m. Okay, Eno2's inclusion is half that length but still. So what exactly is an Ethernet filter? According to these Brits, its job is to remove noise and unwanted interference emanating from the router and connected devices, WiFi and mobile networks which primarily occurs in higher frequency bands. If this out-of-band noise enters the system via the RJ45 socket of the streamer/server, it noticeably degrades the sound.