Tahsin Sevgel
Audio Devices
Tahsin Sevgel
Audio Devices
Model2 Custom Inear Monitor
MSRP: OBSOLOTE
Tuning Philosophy of Model2
Model2 is based on my taste of sound; The midrange.
"A Freshman audiophile starts with excitement of bass, then discovers details of treble, and finally enjoy from the midrange."
I first encountered this motto during a period when I was very attentive to the high details of my initial journey, and over time, I personally experienced its truth. After I started developing custom inear monitors, reading some articles about how human hearing works helped me understand the reason better.
Here's the idea:
"Evolutionarily, the human sense of hearing has certain functions. These include protecting humans from dangers, capturing sounds from nature for hunting, and detecting natural events. The separation of sound frequencies in hearing occurs in the cochlea. Therefore, we can think of each frequency region as a separate signal receiver. In nature, low-frequency sounds often originate from urgent situations requiring quick escape (animal roars, earthquakes, lightning, and similar high-intensity events). Mid-frequency sounds are more related to human communication, interactions between humans and their pets or other animals, and ordinary natural events. High-frequency sounds, on the other hand, come from fast-moving creatures like mosquitoes, birds, or similar animals..."
For Model2: The bass and treble are extensions on either side of the midrange frequencies. A well-rendered midrange, along with sufficient quality bass and detailed smooth treble, will automatically provide a complete sound. We cannot consider the spectrum independently of each other. A well-rendered midrange ensures realistic tonality, separated stereo imaging, and a clean presentation.
Model2 is developed to provide users not with an overdose of adrenaline cocktail, but with the true emotions and flavors in music.
Development History of Model2
The development of Model2 was built upon the evolution of the RS2 I created during the RevoStage period. The main reasons for this were, firstly, my experiences with the RS2 drivers, and secondly, the suitability of these drivers for tonality and the application of different techniques.
The idea for Model2 arose from the desire to apply all the tricks I had discovered but had not implemented in previous products. I wanted to use everything I had on this product. Previously, while researching wire for making a high-end CIEM cable, I found a surprisingly thin copper cable listed at the highest price. Despite its feather-light weight, the IEM cable I made with it provided a cleaner and more powerful sound than thick silver cables. I was shocked, and since then, I had the idea of using this in a product. During the development of Prelude, while testing 3 and 2-driver prototypes, I experimented with capacitors and resistors used in high-end headphone amplifiers and DAC cards. These were expensive and large enough to barely fit into custom IEM shells. However, the difference they made was worth using. Instead of using this idea in a budget-friendly product like RS2, I decided to save it for future use. I also wanted to use the soldering techniques and the advantages of fully filling the earphone shell discovered during the Prelude development in Model2.
Thus, the initial form of Model2 emerged, but there were still areas for improvement in the raw product. Firstly, it was clear that the driver resonance needed further optimization. For this, I needed to develop the lacquer technique I had discovered during the Prelude period, which has been used for toning wooden instruments for hundreds of years. I developed a resin-based coating with custom-made materials entirely derived from wood. For more effective results, I impregnated paper with it to cover the internal electronics. Then, I applied a separating adhesive layer to prevent the coating from interacting with the shell's filler. This way, I did everything I could to optimize the resonance inside the earphone shell.
However, there was still something missing in the development of Model2. An old audiophile friend of mine suggested that I could use copper in the sound tubes. Initially, the idea was to use copper sound tubes only in a short section near the sound outlet, but I wanted to achieve the highest benefit by using copper and brass dampers throughout the entire sound tube. To prevent oxidation in the copper sound tubes and improve the resonance of the surface, I applied an inner coating of natural resins.
Thus, I applied all the techniques I could inside the shell.