Gemini HD IEM, one of the higher models from Accutone audio company, with a single Beryllium dynamic driver of 8mm diameter, a mix of stainless steel and aluminum shells and three different tuning nozzles. While there are still some reservations on the overall cable quality and the almost none included accessory pack, the Gemini HD still offers a really impressive sound quality at the price of $129.
- Speaker: 8mm Beryllium dynamic
- Sensitivity: 105 dB
- Impedance: 20Ω
- Weight: 30g
- Cable: 1.3m, iPhone headset
- Plug: 3.5mm TRRS
The current packaging has been changed from the previous releases of the Gemini HD, but nonetheless the earphones arrive in a hassle free solid cardboard box. The accessory pack is below the minimal standard for any IEM in the market regardless its price tag; there are only 2 pairs of Comply Foam tips in medium size (one pair already attached to the nozzle) and a small case. While the inclusion of the foam tips is a nice touch, the lack of a proper silicone eartips selection is unforgivable for a product priced over the $100. What the Gemini HD does include is 3 sets of tuning nozzles, which is a key feature of the product.
Looking at the earpieces themselves, the build quality is quite good. They’re made of stainless steel material, well finished and without any sharp ends. Same for the different nozzles which are made of good aluminum type and are easy to screw to the front part of the main shell. The form factor goes back to the more traditional (if a bit archaic) cylindrical designs that may not be too fancy nowadays. There is no strain relief but instead a long metal stem.
The cable quality on the other hand is rather uninspiring. Not being detachable is not a real disadvantage, but it looks and feels very cheap; kind of a standard and mediocre white cable, with a bit rubbery coating, missing a slider, with small y-split and 3.5mm TRRS mic’ plug. The remote control too is made of plastic and doesn’t give a very durable look.
The fit is very easy with the straight tube design, but finding the correct tips to match the nozzle may take a bit of tries, and only one size foam tips is not helping either. While the earpieces are rather compact and comfortable, they do carry noticeable extra weight, requiring to be adjusted from time to time; using the cable over-ear is possible, but the weight still prevents a fixed fit for long time.
Having 3 different tuning nozzles not always means a real change on the overall sound presentation, and sometimes the tuning system is poorly achieved. However, on the Gemini HD it is surprisingly well made putting a well perceived different focus on the 3 frequencies, bass, mids and treble. Differences are certainly not day and night, but there is a nice change on the tonality and also in the quantities and position of the bass and midrange with a bit less effect on the treble part. Technically, what the filters are doing here is moderating the bass response which reflects into the midrange and slightly in the low treble, depending on the filter used.
While the filters labels are “warm”, “balance” and “clear”, it is more relative to the raw driver signature, rather than a universal description.
The lows start from being powerful, abrasive and too dominant with the red ‘warm’ filter, and then drop down some decibels with the green and blue ones for a much better equilibrium along the whole freq. response. Regardless, the quality is quite good, very enjoyable, and dynamic with good texture. Speed and accuracy is decent but nothing outstanding. While with the red filters the bass gets loose and shadows the lower mids, with the green, and even more with the blue option, it is tighter and more controlled. Extension is somehow limited and sub bass and depth reach is missing a bit giving a more centered effect.
The midrange is quite favorable, and probably the best deal of the Gemini HD. It is about neutral in position to slightly forward (though overshadowed with the Red filter, and more if the Comply foam are used). Overall, it is smooth, detailed and musical at the same time. Even with the blue ‘clear’ filter the mids are very dynamic and have more emotion. For instance, the Vsonic GR07 (Classic or Bass ed.) is much leaner and flatter, but lacks the ‘fun’ factor of the Gemini if less accurate and airy. Separation and resolution is good too, but vocals are a strong point of this IEM, smooth, sweet and rarely sibilant.
The highs are mostly smooth and controlled, if missing in the upper extension. They do not stand out in terms of quantity either, but safe from being called dark or too laid back. Only with the blue filters there is some added extra sparkle, but not to classify as a bright tonality.
Stage is around average, not too narrow but doesn’t give a wide and spacious effect. Synergy is good with any kind of source, from smartphones and small DAPs, and can scale a bit higher with a more dedicated player like the Aune M1s or PAW 5K, but is more on the player side. Nevertheless, the sound of the Gemini HD is very likeable.