Disclosure: I’d like to thank Simgot for sending me the EA1000 Fermat for this review. All thoughts and opinions are my own, and Simgot had no say or input for the contents of this review. Purchase links for the EA1000 are at the end of the review.

The Simgot EA1000 Fermat is a single DD IEM that features a hybrid driver setup, as the DMDC (dual magnetic, dual chamber) dynamic driver is paired with a passive radiator to help improve bass performance. Very few IEMs have tried this so it will be interesting to see the effect it has on the sound signature and performance. The EA1000 is selling for $219 USD, putting it on the higher end of the scale. So far Simgot has been able to do no wrong, as I have loved the three previous IEMs of theirs that I’ve reviewed (the EM6L, the EW300, and the SuperMix 4). I’m hoping the trend continues, so let’s get into the review and see what the EA1000 Fermat has to offer.

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• Simgot EA1000 Fermat IEM
• 0.78mm 2-pin to 3.5mm Silver-Plated OFC cable
• Two sets of S, M, L silicone ear tips
• Storage case with magnetic clasp
• Two additional tuning nozzles (silver and gold)
• Spare colored rings
• Documentation

Simgot loves to pair unique themes with their IEMs, and the EA1000 is no exception. “Fermat” refers to the mathematician Pierre de Fermat and a math problem that he wrote in 1637 that was dubbed “Fermat’s Last Theorem”, which was finally solved some 350 years later in 1995. Math and music do share a relationship, so it’s an interesting and fun way to incorporate this kind of theme with an IEM. Anyways, the reason I bring this up is because it’s the first thing you see when you open the box. Simgot does presentation very, very well.

In the box, which is neatly and logically organized, we have the accessories. Let’s look at the cable first. It’s a two-wire silver-plated OFC cable, with good ergonomics and no microphonics. It’s on the thicker and stiffer side but can be easily moved and retains its shape very well. The gold chin strap is a nice accent in the silver and gray color scheme.

The faux leather storage case is excellent. While not very portable, it has lots of room, feels extremely solid, and I love the magnetic clasp. There’s easily enough room in it to fit the IEMs, tuning nozzles, spare ear tips, and a dongle DAC.

The included silicone eartips are fairly standard, and you get two sets of them.

Lastly, we have the tuning nozzles. In all, there are three tuning nozzles to choose from: a silver nozzle with a red ring, a silver nozzle with a black ring, and a gold nozzle with a white ring. Also included are spare rings, which is thoughtful. The silver nozzle with the red ring is installed by default.

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The EA1000 looks very striking and premium. It has a polished stainless steel shell that not only looks visually stunning but feels sturdy and solid. The faceplate has the Simgot logo on a white textured background, which I think accents the reflective shell nicely. On the inside of the shell, you can see the vent for the passive radiator, which is also where L and R are indicated. The outside edge of the EA1000 features the “Fermat” name. Note that the shell is an absolute fingerprint magnet, so you’ll want to keep a cloth handy if the fingerprints bother you.

The nozzle diameter is slightly larger than average, making for just a slightly tighter fit for my ears. Comfort is still very good though and I had no issues with discomfort or fatigue, even after 2 hours of use. Isolation is just average though. I was able to get a good seal, but some amount of outside noise was still perceivable, and this may be due to the vent for the passive radiator. There is no noise leakage though.

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The Simgot EA1000 is fairly easy to drive, with basic sources and dongle DACs giving adequate volume and power. That being said, the EA1000 scales extremely well with higher quality sources, with details becoming slightly sharper and the sound a bit clearer and cleaner. It doesn’t demand more power, but it certainly takes advantage of it. If you all have is an Apple USB-C to 3.5mm dongle then that will be just fine and you won’t be losing any sound quality as a result. Considering this is a $219 USD IEM though, you most likely won’t be using it with a simple dongle DAC. I found ideal pairings with the iFi GO Link Max (and original GO Link), as well as the Qudelix 5K. Interestingly I found myself having to adjust the volume a bit in tracks that have a large dynamic range, most likely due to how the bass and treble are balanced.

Despite having three different tuning nozzles, the sound signature is roughly the same with only minor differences between the nozzles. I’ll list the main differences below, but the majority of my thoughts on the sound quality are in regard to the silver nozzle with the red ring.

Silver nozzle with red ring (H-2019 Target):

Installed by default and my preferred nozzle. Overall balanced with the least forward upper-midrange and lower treble. Bass has the most impact compared to the other nozzles.

Silver nozzle with black ring (Simgot Classic Target):

Slightly more forward upper-midrange and lower treble.

Gold nozzle with white ring (Simgot Golden 2023 Target):

My least favorite tuning. Slightly more forward upper-midrange and lower treble than the silver nozzle with the black ring, and overall slightly less bass. Sounds the most open but was the most fatiguing for me.

Noting the differences in the nozzles above, the overall sound signature of the EA1000 leans towards being V-shaped. It has excellent resolution and instrument separation, and does tend to lean a bit bright, but isn’t sibilant or piercing. It also sounds very natural and has superb timbre for its price range. All this makes for a great clinical listening IEM that can also be used for casual listening, especially when using the silver nozzle with the red ring as it’s the least fatiguing tuning.

Bass

The bass is clean and detailed, allowing you to hear a lot of details that normally you wouldn’t be hearing, such as the plucking of the bass guitar strings. It’s also very controlled with good impact, but not so much slam or rumble. Texture is also excellent. There seems to be the most presence in the mid-bass which makes the sound signature very enjoyable and balances things out nicely with the treble. This is almost my perfect bass preference, just lacking a bit of sub-bass extension.

Midrange

The midrange performance is very, very good. The instruments sound natural and are well-layered and clear. The neutral and clean sound helps bring out pianos and female vocals, both of which are very accurate and enjoyable to listen to on the EA1000. Male vocals are good as well, but for rock and metal tracks they would sometimes get lost in the overall mix, especially for faster songs. The EA1000 is really strong for male vocals with slower tracks, acoustic tracks, and live music tracks.

Treble

The treble is really detailed, and usually, when an IEM has a detailed treble they become harsh or slightly sibilant in some tracks. Not the case with the EA1000, it was fatigue-free for me. The treble is also clean and resolving, with cymbals especially sounding very natural. At higher volumes though it does get piercing and fatiguing, but I never really found myself having to turn the volume up high enough for it to be a recurring problem.

Soundstage and Imaging

The EA1000 has solid technicalities. The soundstage has good width and height, and average depth. I feel this works in the EA1000’s favor though so that tracks don’t sound too open or airy, and really helps with intimate-sounding tracks. Imaging performance is accurate and solid, I found no issues here.

Clean and detailed are the two words I would use to describe the EA1000. Those traits show up in every aspect of the sound signature, allowing you to hear the whole audio mix. You can tell every aspect of the EA1000 has been tuned in order to accomplish this, yet still maintain some fun and energy so that it doesn’t sound sterile. That’s hard to do, and it’s amazing that Simgot was actually able to pull this off with very minimal sacrifices. On a single DD no less, though that passive radiator does help in the bass region.

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The Simgot EA1000 Fermat is a unique IEM. Not just because of its hybrid driver setup that pairs a passive radiator with a dynamic driver, but mainly because of how well-implemented the sound signature is. The whole sound profile is very controlled in the sense that every decision for how it is tuned and how it sounds is intentional. The bass and treble beautifully complement each other, and the midrange isn’t sacrificed to achieve it like on so many other IEMs. What this means though is a sound signature that will not be for everybody, notably those looking for more sub-bass or for more treble extension will have to look elsewhere.

For the price of $219 USD, while it is not a small amount of money, the EA1000 lives up to the price. Some of Simgot’s cheaper IEMs may offer better overall value, but the EA1000 Fermat certainly surpasses them on the technical level, offering something that is hard to get anywhere else. That is why I have no problem recommending these IEMs to anyone who is intrigued by their sound signature, you will be very happy with it.

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I’m not always able to cover all the details of a product, both hardware and software, in our reviews. If you have any specific questions you’d like answered about this product please feel free to leave a comment or contact me directly.

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