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HeartField Acoustic Deer IEMs – The Woods Answer Music’s Call

HeartField Acoustic Deer IEMs – The Woods Answer Music’s Call

HeartFiled Acoustic Deer is a high-quality IEM priced at 169 USD, and will be compared in today’s written review with KB Ear Aurora (169 USD), Dunu Falcon PRO (220 USD), 7Hz Timeless (220 USD), and QoA Queen Of Audio Adonis (190 USD). 



Heartfiled is a new company about which I’ve never heard before stating to write today’s review, but this is exactly what Linsoul does, they help new companies with excellent sound get the exposure they need, and they help bring the word forward about products that are excellent, but would otherwise stay under your radar as they didn’t yet make a name for themselves. This is actually important for us music lovers and audiophiles because Linsoul helps drive prices down, innovation up and brings all those unknown gems from China right to our doorsteps. The best part is that even if you don’t have a strong belief in Linsoul, you can actually purchase their products from Amazon and enjoy the full coverage that Amazon offers, along with excellent support from Linsoul

It should be noted that I have absolutely no affiliation with Heartfield Acoustics or Linsoul, I am not receiving any incentive for this review or to sweeten things out. I’d like to thank Linsoul for providing the sample for this review. Every opinion expressed is mine and I stand by it. The purpose of this review is to help those interested in Hearfield Acoustic Deer HiFi IEMs find their next music companion. 


Product Link

You can grab one from www.amazon.com here: https://amzn.to/3RrqlWN

If you’re in the UK, you can grab one from www.amazon.co.uk here: https://amzn.to/3AMSUrA

And if you’re from Europe, you can grab one from www.amazon.de here: https://amzn.to/3RwOYRI


Build Quality/Aesthetics/Fit/Comfort

The design of the Deer IEMs is pretty basic and usual, with a full metallic shape, and a faceplate shell that reminds of diamonds and a very flashy aesthetic. It looks like Linsoul has a lot of philosophy behind the Heartfield Deer, as they mention that the word Deer refers to eternity of love in Ancient Chinese, along with happiness and success. The faceplate has 198 gem-like crystals, and the IEMs look pretty nice in person. It really makes me wonder if Linsoul and Heartfield wanted to name this IEM “dear” instead of “deer”

The cable is the usual cable with a 3.5mm plug, it is not very tangle prone, and it is fairly ergonomic. The ear guides are made of silicone and are soft, which helps a lot with the comfort, while the cable does not conduct any microphonic noise in my experience. Although Deer uses a 6.8mm Composite Dynamic Driver, I could not find any ventilation or opening, even though I could not get any driver flex either from them. The inner chamber is coated with a brass-platinum material that helps Heartfield Deer with the sonic performance. 

Heartfield Deer offers about 10-20 dB of passive noise isolation, being on the lower spectrum and being less isolating than most of the competition. This being said, this is one of the most comfortable IEMs I have tested in my entire life, and I absolutely love the overall fit and ergonomics. They simply stay well in my ears, and Hearfield Deer has no parts that I would consider uncomfortable, plus it has a high quality tip selection from the factory, and although those tips look like your usual tips, they are very comfortable and cause me zero discomfort, they are not slippery, making HeartField Deer a pleasure to use. 

In terms of technical information, Deer has a SPL of 108dB, combined with a rather low impedance of 16 OHMs, which I can confirm, they are easy to drive, and are pleasingly loud even from my smartphone, Xiaomi Black Shark 4, and even better from dedicated DAC/AMPs such as Lotoo PAW S1, ddHIFI TC44C, Jade Audio Ka1, or Tempotec Sonata HD II. The cable is attached to the IEM with a 2-Pin connector, which is also good and allows for you to easily replace the cable if it breaks. 


Sound Quality

We have a really clean and natural sound on The Heartfield Deer, which has a really strong bottom end. This is the wet dream of any basshead on a budget, and the sound is dominated by a strong sub-bass, which does not overshadow or overcolor the midrange, and with a slightly stronger upper midrange, and a natural presentation for all instruments, Heartfield Deer sounds just right, and it seems like the signature fits my sonic preferences better than any pair of gloves I have worn my entire life. For today’s review, I have paired Heartfield Deer with a multitude of sources, including Questyle M15, Hiby FC5, iBasso DX240, Astell & Kern SE180, Lotoo PAW 6000, and Dethonray Prelude DTR1 +

The bass of Heartfield Deer is by far the central element of their sound, and it isn’t the bass in its entirety, but the sub-bass which is really surprising. For a driver that’s dynamic and smaller in size, just 6.8mm, HeartField Deer has an outstanding sub bass presentation that has incredibly high impact and a perfect sub-bass extension, down to 20 Hz. I rarely hear such a nice sub-bass, and Heartfield Deer has a really natural and smooth transition from the sub-bass to the mid bass and upper bass. The lower midrange is not overly colored by the sub-bass, although it does inherit some of that thickness and low end substance and weight. The sound of Deer has extremely low distortion, and can take extremely high volumes without distorting the bass or any other part of their sound. 

The midrange is really clean and natural on Heartfield Deer, and although the IEMs have a strong and bold presentation, they have good to excellent instrument separation, and good soundstage. The surprising part about the midrange is how natural and smooth it is. If most sub 300 USD IEMs will have some degree of grain to their sound, which is natural, Heartfield Deer has a really smooth presentation, similar to what you typically get at 500 USD, and in fact, they have a similar midrange when compared to Metalure Wave, which is also very liquid, fluid and natural in the presentation. HeartField Deer also has a surprisingly good overall harmonic presentation. The thing here is that Deer has a satisfying harmonic, so it makes usually harsh and hard instruments sound musical, so stuff like accordions, trumpets have a really relaxing sound to them, without lacking the resolution they should have. 

The treble of heartfield deer has most of its energy in the upper midrange / lower treble, and there is not a lot of mid or upper treble present, but there’s enough lower treble to balance out the stronger and bolder bass. The treble rolls off gently after 10kHz, but it has a relaxing texture which is once again unusual for the price range of Heartfield Deer. The sound is satisfying, bold, with a strong bottom end, and it is interesting. The detail and resolution is better than most IEMs have in the price range. Heartfield Deer also has super strong dynamics and the sound is never bland or flat. 



HeartFiled Acoustic Deer vs 7Hz Timeless (169 USD vs 220 USD) – 7Hz Timeless is an outstanding IEM as well, but the signature is much brighter than that of the Deer, and the comfort is also much better on Deer. The raw resolution is similar, although for my ears Deer has a much more natural sound which helps me notice details that on Timeless come through wrong or as artifacts that the brain can’t process into a specific sound or instrument. If you know you enjoy extremely bright IEMs, Timeless is still one of the best I can recommend, while if you want something that sounds natural, clean, but still has a pretty bright treble, and a deep, satisfying bass, much more low end substance, impact and sub bass, HeartField Deer is a top IEM and better than 7Hz Timeless, for a lower price. The package of 7Hz timeless is better than that of the HeartField Deer. 

HeartFiled Acoustic Deer vs KBEar Aurora (169 USD vs 169 USD) – The comfort is slightly better on Deer, which has slightly better eartips and slightly more ergonomic shape, although the cable is slightly better on Aurora. The overall sonic performance is very different, with Aurora being smoother, and Deer having a much stronger sub bass, more satisfying impact and bass, more sub lows, a more natural midrange, and more detail too. The treble is more energetic on Deer, and it just sounds generally more open and better defined. Especially the bold low-end helps Deer with its better definition of each instrument. KB Ear Aurora has a better package, and a marginally better default cable, although the color of the cable is unusual on Aurora. 

HeartFiled Acoustic Deer vs Dunu Falcon Pro (169 USD vs 220 USD) – The overall package is better on Dunu Falcon PRO, and it has a more unique design, with better build quality, but the comfort ends up being a bit better on HeartField Deer, which also has better passive noise isolation. The sonic performance is quite different, Falcon PRO is warmer in the mid bass, with more warmth, whereas Heartfield Deer has better sub bass quantity and impact, more low end, and better sub low end extension. The midrange is more natural, with a more organic presentation on the Deer, although Falcon PRO has a wider, more airy soundstage and presentation. The upper midrange is smoother, cleaner and better defined on HeartField Deer, while it is brighter and more airy, better extended on Falcon PRO. 

HeartFiled Acoustic Deer vs QoA Queen Of Audio Adonis (169 USD vs 190 USD) – The overall package is once again better on QoA Adonis, and it comes with a better overall design, more eye-candy for me, while Deer manages to have better overall comfort and ergonomics. The passive noise isolation is stronger on the Adonis. The sonic presentation is much brighter on Adonis, which has much lower sub bass and bass amount, less impact, and HeartField Deer sounds much deeper, bolder and with much better low end. The overall resolution is slightly better on Adonis, and it has a better treble extension, and more air between instruments, also a better overall instrument separation, but the sound is more natural and cleaner on the Deer, which is less grainy and has a smoother texture. 


Value and Conclusion

I hope that things are clear after reading today’s review, but HeartField Deer has one of the best values I’ve heard in an IEM in 2022. Regardless whether we’re talking about wired or wireless, bright or dark sounding IEMs, Deer is outstanding at absolutely everything, and be it the fact that they match well with my taste, they have an outstanding technical performance, and that they are comfortable, Deer is excellent to the point of it being crazy. 

At the end of today’s review, if you’re looking for a natural towards V-Shaped sounding IEM with super resolution, a very pleasing, well extended response, wide soundstage, excellent instrument separation, easy-to-drive design, and superb comfort, HeartField Deer is a top end recommendation and should provide to be a lot of fun. 


Product Link

You can grab one from www.amazon.com here: https://amzn.to/3RrqlWN

If you’re in the UK, you can grab one from www.amazon.co.uk here: https://amzn.to/3AMSUrA

And if you’re from Europe, you can grab one from www.amazon.de here: https://amzn.to/3RwOYRI

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Full Playlist used for this review

We listened to more songs than those named in this playlist, but those are excellent for identifying a sonic signature.  I recommend trying most of the songs from this playlist, especially if you’re searching for new music! The playlists are different for Spotify, Tidal and Youtube, and based on the songs I enjoy and are available on each!




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  4. Kyle

    Darn right brother!

  5. Alberto

    I like those Deer IEMs. The sound is exactly what I’ve been looking for and they’re not too pricy. Thanks a lot for shining light on some of the less known products out there!

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