Astrotec GX-40 in-ear speakers review
Jun 16, 2015 at 2:15 AM Thread Starter Post #1 of 14


Jun 8, 2015

The Astrotec GX-40 is a much anticipated release because of the positive reception of the GX-50, which went on sale just two months ago. Astrotec claims that the GX-40 is as good as the GX-50 in terms of material and sound quality, but the price is $13 lower.
Driver:9mm lanthanon permanent magnet
Impedance: 16 OHM
Frequency response: 8 Hz-24.5 kHz
Sensitivity: 104db
Rated power: 3mw
Power capability: 15mw
Cable length: 1.2m PU
Plug: 3.5mm gold painted straight plug

Retail Package

The Package came in a yellow box with their brand’s logo and a see-through window for the back of the headphone’s earbud. It doesn’t get much simpler, especially for in-ear speakers in this price range. The back of the box displays some basic specifications, while the sides contain some slogans.



Astrotec GX-40 in-ear headphone
Cleaning cloth
3 pairs of eartips (M/L and a pair of sponge eartips)
Carrying bag



We don’t normally like talking about the design of headphones while we are reviewing them, but the Astrotec GX series headphones are truly special in their look.


The GX-40 is almost identical to the GX-50 in terms of design, the only noticeable difference is its fixed cable, compared to the detachable cord of the GX-50. Also, the GX-40 get rid of the shape memory material used on the part where the cable joins the housing, likely due to the reason of cutting cost.

The design that really makes the GX series headphones (including the GX-40 and GX-50) stand out is the crystal glass with 3D diamond shaped pattern on the back of the headphone’s ear buds. The glass disperses light in an interesting manner at different angles, giving the headphone a very shiny and premium feel. Offering more personalization to the consumer, the glass decoration and the shell are available in many beautiful colors. The unit that we are reviewing here is Neptune Blue, which has a mirror glass and a blue transparent shell.

The cable is made of oxygen free copper and is covered in a slightly rubbery and springy PU coating. It has very nice strain reliefs where the cable meets the housing. The cable jack is a straight plug, made of metal coated in gold.

The build quality of the GX-40 (as with all Astrotec headphones) is as good as those high-end headphones. By “high-end” I mean the likes of Monster Turbine, Beats Powerbeats, which would normally cost you several hundred dollars. The GX-40 feels like a much more premium pair of speakers than the price tag would suggest.

For listening, I mainly used a LG Optimus G Pro 2, an Apple iPod Shuffle and the Acer ICONIA W700 tablet/ultrabook hybrid with various tracks of different genres (to gauge what genres the GX-40 is a good match with), without an amp. Almost all portable devices have plenty of power for the GX-40, the amplification is not necessary at all.

Sam Smith – I’m Not the Only One
Ed Sheeran – Blood Stream
Macklemore & Ryan Lewis – Otherside
Emeli Sande – Read All About It
Daft Punk – Get Lucky
Cheryl Core – Parachute
Ed Sheeran – Sing
Rebecca Ferguson – Teach Me How To Be Loved
Alicia Keys – We Are Here
Usher – She Came To Give It To You

BASS: I’m a huge fan of bass-centric music, and I would say that the GX-40 does not disappoint in this area, nor does it impress. It offers good texture and detail without lingering too long in its decay, but the slam and punch is not so hard as the Monster Turbine or the GX-50, and the sub-bass even more so. It is definitely capable in providing fun and some excitement whether I listen to EDM or Metal, but it is certainly far from the best. Overall, I’m happy with the GX-40′s bass performance. However, if compared to the Astrotec GX-50, the GX-40 is just a little bit behind in speed, and most of all in quantity. Please note that this observation was attained by pairing the GX-40 with the Acer Iconia W700. When paired directly to an iPod Shuffle, HTC Desire, or even the LG Optimus G Pro 2, the bass seems to lag behind the findings above, especially in speed and detail.
MIDS: I would say I am happy about how the midrange is presented with the Astrotec GX-40; it may sit a bit lower than bass and treble frequencies but the detail and clarity is retained no matter what genre I listen to. I’m happy to report it doesn’t sound veiled nor muddy. Vocals are presented well, quite accurate and detailed. Most instruments including the Piano sounds natural with excellent timbre. Overall, the midrange presence is quite good thanks to its excellent imaging and instrument separation. The Monster Turbine was more upfront for female vocals and guitars which made it sound more edgy in general. Personally, I’d prefer the Turbine for guitar driven songs but I’m happier with the GX-40′s for multi-genre listening.
HIGHS: I am quite surprised to hear such a smooth treble presentation on the Astrotec GX-40, as the GX-50 which I have been listening to since receiving it two months ago really didn’t deliver in this department. In most cases, treble quality will highly depend on how the music was originally mastered. Well mastered recordings sound excellent on the GX-40. If I were to nit-pick, I’d say the GX40′s timbre in the treble region is a bit off. Also I personally think that it lacks just a bit of air although it’s not really bad for most genres. This affects the soundstage width a bit; not as wide as the Monster Turbine but definitely better than the GX-50.

Comfort and isolation

As with the Astrotec GX-50, the GX-40 is pretty easy to pop in and take out, which is useful when we are taking a walk and suddenly decide to enter a grocery store for some necessities, etc. With that said, the GX-40 is the most comfortable pair of headphones to wear for a long time. I started to feel the burden on my ears after wearing the GX-40 for two to three hours, although not to the point of desperately wanting to take it off.
The isolation offered is the same as the GX-50 – par excellence. Although it doesn’t have the active noise-cancellation feature of the some higher-end speakers, it still does a good job of passively sealing out the sound from the outside world. I used the GX-40 on a crowded bus, on an airplane and on a speed train and it blocked out more than 95% of the noise.

CONCLUSION: The Astrotec GX-40 may look like the GX-50, but the sound it offers is quite different. The GX-50 is more designed for bass heads, as it offers excellent sub bass rumble, slam and punch. The GX-40 is much more balanced in the bass, mids and highs, and presents much better vocals and piano sound. Overall, I would describe the Astrotec GX-40 as one of the best, if not the best in-ear headphones priced below $70.
Jun 17, 2015 at 7:41 PM Post #2 of 14


1000+ Head-Fier
Jan 12, 2013
They look great, wonder how they compare to the Audio-Technica IM50/IM70, Ostry KC06 and VSonic VSD3S...
Aug 8, 2015 at 8:38 PM Post #13 of 14


100+ Head-Fier
Aug 14, 2012
Dang, my TTPOD T1E is dying :frowning2: :frowning2: and it's the freaking cable. I might order these from Aliexpress to try them. Would you recommend the GX-50 over the 40? I don't want any trouble with the cable in the future.
Jun 15, 2016 at 5:33 AM Post #14 of 14


Jun 8, 2015
  Dang, my TTPOD T1E is dying :frowning2: :frowning2: and it's the freaking cable. I might order these from Aliexpress to try them. Would you recommend the GX-50 over the 40? I don't want any trouble with the cable in the future.

I think it depends on what kind of sound you want to get from your headphones, the GX-40 is more balanced, but it lacks the punch the GX-50 offers.

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