Consumer Electronics, Gadgets & Accessories

Gravastar Sirius Pro in test – Extravagant in-ears with a clear target group

When new headphones are on the wish list, it is usually primarily about features like sound quality or good noise suppression. The look is often only a secondary consideration, and most in-ears come in plastic housings that are unobtrusively designed in simple shapes and colors.

In contrast, the Sirius Pro from Gravastar, which we are testing today, go in a completely different direction. The Gravastar company specializes in audio products with extravagant sci-fi looks, and so the in-ears go for a futuristic look with an extravagantly shaped metal housing that comes in five different color combinations.

Apart from that, Gravastar presents somewhat more classic values: It advertises a strong bass as well as “3D sound”. In addition, the in-ears are supposed to feature ear detection as well as touch control, RGB lighting, IPX5 certification and a bottle opener housed on the case.

For this total package, the manufacturer is asking between $130 and $150 – depending on which color combination is selected. For the lower price, the in-ears come in a choice of black, gray or neon green; and for said extra cost, the device is still offered in a “used look” in dark gray and yellow.

In our test today, the Gravastar Sirius Pro is in the gray variant. In this color combination, the in-ears are currently offered for € 129.95 * [test time: 130 Euro ] at Amazon. Whether and for whom Gravastars Sirius Pro are worthwhile for this price, we clarify in the following test.

Technical details (manufacturer specifications)

Connection: USB-C, Bluetooth 5.2
Battery: 4 h (in-ears), + 12 h (case), 400 mAh, Li-Ion
Weight: 6 g (per earpiece)
Features: RGB lighting, (ENC)
Variants: Matt Black, Space Gray, Neon Green, War-Damaged Yellow*, War-Damaged Gray*
Price € 129.95 *

Scope of delivery

Already from the packaging you can see directly that the Sirius Pro present themselves differently than most in-ears: instead of a cardboard box, the headphones are delivered in a plastic box shrink-wrapped in foil, which has a transparent window and thus allows a direct view of the in-ears. Visually, the packaging with its sci-fi look already gives a foretaste of the in-ears and the charging case – more on that in the next section.

Inside the plastic case, which can be opened by pressing the green latch, are the in-ears and the charging case, as mentioned earlier. In addition, Gravastar also supplies six additional top caps, a USB-C charging cable that is just under 20 cm long, and a metal chain. The latter can be attached to the charging case via a rubber connector that is also included.

Design & Workmanship

  • Much metal
  • Fancy design
  • No defects

Immediately when you take them out of the package, you notice that the in-ears clearly stand out from the competition in terms of design and construction. While there mostly (high-gloss) plastic housings are used, the Sirius Pro rely mainly on metal – according to Gravastar, a zinc alloy is used for this. This gives the Sirius Pro a very high-quality feel, and the design has also been implemented well.

Whether you like the futuristic look of the case is of course a matter of personal preference, but at least the build quality is beyond any doubt: Plastic is only visible on the upper and lower sides as well as on the lateral opening wheel, otherwise Gravastar relies on metal for the entire body and also on the “lid”, which consists of two black holding arms. This is without any visible or palpable defects, and the imprints are also clean and flawless. There is nothing to complain about here.

Functionally, the charging case is also well implemented: The in-ears are held in their charging base by a bracket. This bracket can be opened via the aforementioned plastic button on the side: When this is pressed, a spring mechanism is triggered, which allows the holding arms to buckle upwards. The in-ears can then be removed and the case closed again.

Like other in-ear cases, the Sirius Pro’s charging case offers a function button located on the bottom. Through this, the in-ears can be reset and the integrated RGB LED lighting can be controlled: A simple press can cycle through six colors (orange, cyan, blue, red, green, purple) or double-click to disable the lighting altogether. When the illumination is activated, an LED strip in the “opening” of the case lights up permanently. Of course, this feature isn’t really necessary – especially since it puts a strain on the battery life – but the illumination fits harmoniously into the futuristic design of the Sirius Pro – and this is, after all, the big unique selling point.

While the charging case comes to a rather high weight of 93 grams due to the use of metal and the expansive design, the two in-ears are very light with a weight of around 5 grams. Compared to the charging case, the earpieces are made of plastic, which is just as well-made. In addition, the imprints here are also neat: on the side, the earpieces are decorated by the manufacturer’s logo, and on the outside, another Gravastar product is imprinted: the Gravastar Mars Pro.

Practicality, wearing comfort & battery life

  • Comfortable to wear
  • Moderate battery life
  • Reliable operation with room for improvement

With an appealing design and impeccable build quality, the Sirius Pro can already score points on its most striking feature. Of course, they also have to offer something in terms of usual in-ear quality. They do so with regard to wearing comfort: The in-ears are easy to insert, are hardly noticeable due to their shape and low weight, and also sit so stably that they do not loosen even during strong head movements. The total of four cap sizes also make the earpieces quite flexible, so they should meet the demands of most users without any problems.

The Sirius Pro, on the other hand, do not fare quite as well in terms of handling. As is often the case, these in-ears are operated via a touch control on the outside, which enables all necessary functions such as volume up, volume down, pause and a song change. The operation works well and also reliably after a short familiarization with the “tempo” of double and triple clicks, but we would have wished for a slightly better implementation of the volume setting.

Whenever the volume is adjusted on the Sirius Pro, the sound stops briefly and only changes to the new volume after a short beep. The interruption is very short, but the listening experience is impaired by the short interruption – you are thrown out of the immersion. A corresponding software update would be desirable here so that a smooth change takes place when the volume is changed. Otherwise, the Sirius Pro’s operating concept is quite successful.

However, the installation of such a software update might come too late, at least for existing customers, because Gravastar does not currently offer an app that can be used to install it. The entire configuration of the in-ears is done via the device itself. Whether the lack of an app is a disadvantage, neutral or even an advantage is up to you.

In terms of battery life, Gravastar advertises a 400 mAh capacity battery integrated into the charging case, which is supposed to last for three full charges. Every single charge is supposed to be enough for four hours, which is probably actually achieved at low volumes. However, the in-ears managed a runtime of about three and a half hours at a usual travel volume in our test. Compared to many competing products, the in-ears are thus quite short-lived: You have to live with listening pauses for longer trips.

Interestingly, the charging case allowed one more charge than advertised: In our test, the in-ears could be recharged four times, whereby they lasted the said three and a half hours three times and three hours once. Overall, you can thus expect around 17 hours of battery life with the in-ears and the case.

Recording and playback quality

  • Solid sound
  • Very good bass
  • Moderate recording quality

Build quality, operation and battery life – all well and good, but in the end, sound quality in particular is also important for in-ears. The Sirius Pro can score points especially in the bass: This sets in very early with about 30 Hertz and provides the right songs for a powerful mood: The beats are crisp and voluminous, without taking excess. You get your money’s worth here.

However, the in-ears do less well in the other frequency ranges: Considering the price range, we missed a higher level of detail in the mids and trebles, and the three-dimensionality is only average at best. This is not changed by the alternative “Movie Mode”, in which high frequency ranges are pushed into the background in favor of lows and mids.

Overall, the Sirius Pro’s sound falls short of the usual demands of the price range, which is at least understandable considering the focus on looks and build quality as well as the presumably comparatively low unit count, but of course also a pity. Nevertheless, the sound is never annoying, and the reproduction is always noise-free. And especially those who only use the in-ears outdoors, for example during sports or on the way to work, shouldn’t really benefit from a higher sound quality anyway.

Particularly with regard to loud environments, however, we miss a real, active noise-cancelling: The Sirius Pro do keep quite tight and thus fade out noises to some extent, but of course this cannot be compared with real ANC. Furthermore, no transparency mode is provided.

The last discipline to be evaluated is the recording quality. Unfortunately, the Sirius Pro is hardly convincing here: The sound is sufficient for communication, but the voice is partly distorted. The in-ears can thus be used for short phone calls, but other products should be used for longer conversations or even video conferences.

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Gravastar Sirius Pro: test conclusion

For € 129.95 * [test time: 130 euros ] Gravastar offers in-ears with the Sirius Pro, where the final score is rarely difficult. On the one hand, the in-ears undoubtedly stand out due to their looks and model variety, and are virtually unrivaled in this point – especially since the build quality, with the generous use of metal, is also excellent.

However, the rest of the implementation looks less good. While the touch controls and the ear recognition function perfectly in principle, we would have liked to see an option that does not interrupt the playback every time the volume is adjusted. Furthermore, the battery life is below average at around three and a half hours per use and 17 hours in total, and the Gravastars can only stand out in terms of sound to a limited extent. While the recording quality is rather rudimentary, the in-ears have a real advantage at least in the bass: The low frequencies are really fun with the Sirius Pro. Above that, an even slightly higher level of detail would have been nice.

However, for the customers who are the target group of the Sirius Pro, the mentioned points are probably only of limited importance, because as already mentioned, the in-ears are virtually unrivaled due to their special look – and they can be used as headphones without any problems. In short: If you want the design, you can definitely get the in-ears and have a lot of fun with them. However, you should ideally wait for a discount promotion for the purchase. For example, the in-ears were recently offered on Amazon for just under 100 Euros.

Gravastar Sirius Pro: Silver Award

Gravastar Sirius Pro

Sound quality
Recording quality
Value for money


Sonically restrained in-ears with outstanding look and feel.

Gravastar P9 Sirius Pro price comparison

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Simon Lüthje

I am co-founder of this blog and am very interested in everything that has to do with technology, but I also like to play games. I was born in Hamburg, but now I live in Bad Segeberg.

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When new headphones are on the wish list, it is usually primarily about features like sound quality or good noise suppression. The look is often only a secondary consideration, and most in-ears come in plastic housings that are unobtrusively designed in simple shapes and colors. In contrast, the Sirius Pro from Gravastar, which we are … (Weiterlesen...)

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