This is the personal blog by Klaus Eulenbach. It mostly features portable audio products, reviews and editorial content. This blog uses photos with extended color space. The images are best viewed on an HDR-capable display.


IEM Target in a studio
Blog, General, Measurements

IEM Targets: One Last Word

Let’s discuss IEM frequency response targets — probably for the last time on this blog. I’ve previously touched on this topic before. Many fellow headphone fans are putting a lot of effort into making sound objective and finding the ideal frequency response target. But I think there’s one oversight that...
Blog, Reviews, Sennheiser

Sennheiser HD 650 in 2025

Lately, I noticed the availability and pricing of the Sennheiser HD 650 became unstable. Prices are on the rise and I heard a rumour about what could be the cause. So to add this classic headphone to my collection (again), I ordered one very recently and want to put this...
Blog, IO Audio, References, Reviews

Unboxing: IO Audio Sogno

I had teased and mentioned the IO AUDIO (I\O Audio) Sogno in my SIAS impressions. On that day, I think it had the best-tuned upper mids and transition into treble that I have heard in a very long time. So I went ahead and purchased a pair from Shenzhen Audio to share my...
Blog, Oriveti

First Impressions: Grand Oriveti Supremacy

Intro These are my first impressions of the Grand Oriveti Supremacy high-end IEM preceding a full review. The Supremacy has a 4-way crossover design with dynamic, BA and EST drivers. Spoiler: It sounds fantastic, is stunningly beautiful and is one of the most comfortable IEMs I have tried so far!...
Blog, General

CIHE Beijing 2024 Show Impressions

In a spontaneous decision, I attended the 2024 China International Headphone Expo (CIHE) in Beijing this past weekend. I had not prepared for the show and was just informed about the event a few days earlier. So I went on a 1-day-trip to Beijing and was one of the hundred...
Blog, Reviews, Softears

First Impressions: Softears Enigma

I received a review unit of the Enigma from Softears and want to share some early impressions. I am currently traveling so I neither have access to my main camera nor my measurement setup. So please excuse my lazy snapshots using my wife‘s (highly portable) Fuji X100V and the lack...
Blog, General

Peak Design Small Tech Pouch

This is a short feature of the newly released Peak Design Small Tech Pouch. I specifically bought it for everyday use. With this tech pouch, I can carry a small selection of IEM with me and also have enough space for sources and accessories. Too often did I miss a...
Blog, Oriveti, References, Reviews

FotM: Oriveti OD200

The Oriveti OD200 is my flavor of the month (FOTM). Read the following review to find out why. Introduction In the international grand scheme of Head-Fi, Oriveti is one of the lesser-known brands. That is quite surprising to me because they have released excellent products before. At its time, the...
DUNU Falcon Pro Review
Blog, DUNU, References, Reviews

DUNU Falcon Pro

This DUNU Falcon Pro review was published on another audio blog that is now offline. I am reposting it here. Unfortunately, it seems like this IEM is now discontinued. Introduction DUNU Topsound is a well-respected Taiwanese manufacturer of IEM. The brand is deeply connected with the Head-Fi community and has...
Gizaudio Binary Chopin
Blog, References, Reviews

Gizaudio x Binary Chopin

Introduction Welcome to my short review of the Gizaudio x Binary Acoustics Chopin IEM review. My impressions are based on a loaner from Germany‘s official distributor (NT Global). I recommend reading my disclaimer linked below to understand my MotT status and involvement in the community. Full transparency about my business...