Audiophilepure

Iris is a bass-first IEM, and it does not hide it. The low end is big, deep, and pretty addictive. You get a real rumble, plus a nice hit, so it feels fun and physical. But it is not a messy bass. It does not bloom all over the place.

Midrange stays in a good spot. It is not pushed forward, but it is also not missing and gets its due space. The stage is roomy, so the midrange does not feel crowded even when the bass is doing its thing.

Matrix Audio is known for its in-house design of premium high-performance streamers and DACS and recently, a series of all-in-one desktop components. Their latest venture, the mini-i Pro 4, brings their know-how to the desktop with a compact network streamer DAC/AMP that performs each of its functions not just well, but exceptionally well. As a DAC, it paired beautifully with the flagship Pass Labs HPA-1. With headphones and IEMs, it provided not just excellent power and finesse, but synergy with the DAC and network streamer.

https://www.headfonia.com/es-lab-eht-7-review/

The signal switching in the input section is controlled by a set of 5 sealed silver-alloy contact relays, designed for a long lifespan and high current capacity. The EHT-7 offers adjustable impedance (8 0hm or 16 Ohm) for the primary windings of the transformers, ensuring optimal compatibility with your source amplifier.

The EHT-7 is very simple and easy to work with. You can do nothing wrong with this lay-out and it’s easy to plug the cables and flick the switches. From the faceplate to the switches, the inputs and the headphone output, everything feels sturdy and luxurious. Just make sure not to scratch the casing.

The only thing I don’t really like is the external PSU, which looks and feels a bit cheap. I recommend using the Ferrum Hypsos or something similar.

Each EHT-7 unit enjoys a 2-year warranty. Upon ordering the user can also customize the choice of transformers, output bias, connections and more.

https://www.soundstageultra.com/index.php/equipment-menu/1300-burmester-232-integrated-amplifier

The Burmester 232 is one fine integrated amp. It looks like a million dollars. I found it a joy to use, and it operated flawlessly throughout the review period. On the whole, I don’t think the DV2i‑232 combination was quite as revealing as the DV2i-Soulution 511 setup, nor did it have the same dynamic headroom for high volume levels or treacherous loads. However, the basic version of the 232 integrated is much more modestly priced than the Soulution 511 power amp.

Within its power limitations, the Burmester 232 rendered music marginally more beautifully than the Soulution 511. Its reflexes and dynamic range were excellent, with a full frequency response—including truly great bass performance, which is a rare commodity. Its imaging was first-class, although those images were not as wide and deep as those of the DV2i-Soulution 511 pairing. I could listen for long stretches, captivated by the 232’s musicality. There was no trace of amplifier noise, distortion, or compression to detract from its performance. It was a great partner for the reference-level components in my system.

https://www.headfonia.com/fiio-m33-r2r-review/

So, how does the FiiO M33 R2R perform once the music starts playing? Amazing, but we all expected no less, didn’t we?

Coming from the M23 or M21, the first thing that hits you isn’t a “wow” moment – it’s a shift. Where those delta-sigma players deliver a presentation that’s clean, detailed, and slightly analytical at times, the M33 R2R trades some of that razor-sharp definition for something rounder, smoother, and undeniably more organic. Notes don’t just start and stop – they bloom, breathe, and decay with a naturalness that immediately sets the R2R apart from its siblings.