---
product_id: 59972128
title: "ES100 MK2-24bit Portable High-Resolution Bluetooth Receiver/USB DAC/Headphone Amp with LDAC, aptX HD, aptX, AAC (3.5mm Unbalanced & 2.5mm Balanced Output)"
brand: "earstudio"
price: "₩1832"
currency: KRW
in_stock: false
reviews_count: 13
url: https://www.desertcart.kr/products/59972128-es100-mk2-24bit-portable-high-resolution-bluetooth-receiver-usb-dac
store_origin: KR
region: South Korea
---

# 24-bit Hi-Res Audio 10-band EQ App Control 14h Continuous Playback ES100 MK2-24bit Portable High-Resolution Bluetooth Receiver/USB DAC/Headphone Amp with LDAC, aptX HD, aptX, AAC (3.5mm Unbalanced & 2.5mm Balanced Output)

**Brand:** earstudio
**Price:** ₩1832
**Availability:** ❌ Out of Stock

## Summary

> 🎶 Elevate your wired headphones to wireless audiophile status — don’t just listen, experience!

## Quick Answers

- **What is this?** ES100 MK2-24bit Portable High-Resolution Bluetooth Receiver/USB DAC/Headphone Amp with LDAC, aptX HD, aptX, AAC (3.5mm Unbalanced & 2.5mm Balanced Output) by earstudio
- **How much does it cost?** ₩1832 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/59972128-es100-mk2-24bit-portable-high-resolution-bluetooth-receiver-usb-dac)

## Best For

- earstudio enthusiasts

## Why This Product

- Trusted earstudio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **All-Day Listening Freedom:** Enjoy up to 14 hours of uninterrupted playback on a single charge—perfect for work, travel, or leisure.
- • **Customizable Audio Experience:** Fine-tune your sound with the dedicated app’s 10-band EQ and ambient mode to match your mood and environment.
- • **Seamless Connectivity & Calls:** Bluetooth 5.0 ensures stable wireless connection, plus a built-in mic lets you take calls hands-free without missing a beat.
- • **Studio-Quality Sound Anywhere:** Experience pristine 24-bit high-resolution audio wirelessly with your favorite wired headphones or speakers.
- • **Dual Hi-Fi DACs for Ultimate Clarity:** Powered by Asahi Kasei AK4375a dual DACs and amplifiers, delivering balanced and unbalanced outputs with crystal-clear precision.

## Overview

The EarStudio ES100 MK2 is a compact, 24-bit portable Bluetooth receiver and USB DAC with dual Asahi Kasei AK4375a DACs, delivering studio-grade sound through wired headphones or speakers. Featuring Bluetooth 5.0 with LDAC, aptX HD, aptX, and AAC support, it offers 14 hours of playback, customizable 10-band EQ via app, analog volume control, and a built-in microphone for calls, all housed in a sleek metal enclosure.

## Description

Product description Bluetooth 5.0 Qualcomm CSR8675 chipset with the most latest Bluetooth software stack provides robust wireless connection with any Bluetooth sources. DualDrive with two AK4375a ES100 is equipped with two AK4375a, one for each channel. The proprietary DualDrive Technology provides superior, high-fidelity audio quality, doubling the AK4375a capability. High Quality Codecs Sony LDAC Qualcomm aptX Qualcomm aptX HD MPEG AAC 2.5mm Balanced Output 3.5mm (Unbalanced) 1.1 Vp 109dB (+2.8dBu) SNR 2.5mm (Balanced) 2.2 Vp 110dB (+8.8dBu) SNR USB DAC/Headphone Amp USB Audio Class 1.0 USB DAC, Bluetooth and charging all at the same time 10-Band Equalizer You can control the EQ using the companion iOS/Android remote control application. Once configured, ES100 runs the EQ processing without the app, for every audio sources over Bluetooth or USB. Codec, Battery and Volume Control Customize your ES100 by controlling Bluetooth codec, battery, volume and more. DAC Filter & Oversampling 4 types of DAC filter 1x, 2x & 4x Oversampling options Channel Trim & Max Volume Limit L / R channel volume calibration Max. Volume limit

Review: So Far So Great! - Updates on the Bottom I just wanted to add a quick review for now because I think this little device is fantastic and it’s a shame that more people don’t know about it. I will give it 5 stars for my first impression but will continue to update this review as I spend more time testing it. I have been looking for a Bluetooth solution like this for a while now and I had never heard of this company or this product before. Even after finding it on desertcart and seeing the impressive spec sheet, I was very skeptical that it was legitimate. What finally convinced me to give it a try was finding forums on it and seeing people’s experiences with it as well as seeing a strong presence from the company in the form of a representative from the company thoroughly answering questions. Although I’ve seen many pictures and the promotional video about this I wasn’t prepared for how small and lightweight this would be. The device looks very nice and has a simple but functional layout. One button to power on, power off, put into pairing, play, and pause. It also has a volume rocker and a back/next track rocker that is also used to turn on ambient mode. It was very easy to connect to my iPhone and get it up and running straight out of the box in a minute. I don’t want to get too much into sound, battery life, or the app because I haven’t had enough time to test any of them very much. I will say that it does sound great using the 3.5mm jack and AAC codec and I threw a wide variety of music at it. Previously the V-Moda Bluetooth was some of the best I’ve ever heard but I would say so far that this is noticeably better for me. The unit had 75% battery and while I haven’t tested to see if any firmware updates fix a battery issue, the app seems to show the battery life while the battery notification on my iPhone always shows 100%. I used it for an hour on 3.5mm high performance and it took me to 70%. I don’t think this is any real indication of battery life but will try to test it going forward in an update to this review. The app so far is fully featured and I added pictures of the app in this review. With only limited time in the app I will say that I really like the equalizer and the fact that it has a healthy amount of presets as well as what looks like customizable and savable presets but I will test this out more soon. I also briefly tried out the ambient mode and thought it was a very neat feature with a surprising amount of features. I don’t know how much I would personally use it but enjoyed playing with it and found the implementation well done. So far I have only tried it on two of my many headphones but it was a pretty wide range with the IE80S and the HD800S. While I expected it to drive the IE80S without a problem I didn’t expect it to drive the HD800S so well. To think I got that sound quality out of Bluetooth from my iPhone is just amazing and I do see a lot of potential to use my headphones with the ES100. It is a little too early to give any recommendation other than people should take notice of this little device because so far it is very impressive. I will continue to test the ES100 and update my review after a lot more use but if it holds up, I can definitely say it will be a deal at $100. [UPDATE] I’ve still only used this for a couple of days but I am very impressed with the sound this puts out. I’m using the balanced output now and it is hard to believe that this is Bluetooth. I’ve also tried to test the battery and although the battery indicator seems to be buggy, if it is anywhere near accurate the 14 hour estimation of battery life could be very accurate and that is with EQ on, volume at 50%, and using the 2.5 balanced output. [UPDATE 2} There has been a firmware update that seems to have addressed the battery life indicator issue. The ES100 has been working amazingly and it is still impressive how good the quality of the audio is. If I had to change anything about the ES100 it would be with the placement and style of the controls. They do work well but they could be a little better and easier to locate and press without looking. Overall this is a great device and is a must have for people looking for something like this.
Review: A truly fantastic bit of kit. - Tldr? Buy it! Seriously... I had/have the Hidizs Sonata HD II USB DAC, but it kept detaching in my pocket. and it made the phone unwieldy to use, as I had the DAC connecting to my Little Bear B4-X tube amp, and the phones connected to that. Now I have the phones connecting to the tube, but the tube connects to the E100Mk2, (Mk2) which connects via the Bluetooth LDAC codec to my Phone. OnePlus 7t running Android 10. On which I run USB Audio Player Pro (UAPP) which I have route audio to Bluetooth, which allegedly makes the signal cleaner before being sent to the Bluetooth receiver. I'm running in BitPerfect mode. Set Android volume to full to use the Analogue volume of the MK2 On ease of use alone, this is a winner, I can use my phone as normal. It has a phone pass through with a mic built into the Mk2, you can speak and be heard with the MK2 in your pocket. Functionally, it has twin DAC's and balanced output via 2.5" it drives the Tin HiFi P1 (Planar Magnetic) easily, and that is difficult to drive. I'm currently running 3.5" SE but some balanced 2.5" cables have just arrived from China. It also has a great full featured app. Allows you to tweak the roll off of the DAC live with music playing. So you can switch until you find one you like. It has a full EQ, (might be fixed parametric, not sure, not used it.) The battery charges fast by Mini USB. Lasts about two days of medium use. There is a little icon on the Android notification bar, that turns read when it needs to be charged at about 15-20% The button layout is good, with volume under the 3.5" output and power/action FF & RW under the 2.5" output. USB is on the bottom. Bluetooth wise it functions well with my Withings Steel Series HR smartwatch which is also always connected. Supports gapless playback, etc. It also integrates as a default headphone out, so it works with other Apps like desertcart Music HD, etc. All that aside, where it really shines is in how it renders music. With my Hidizs USB DAC, (which was an upgrade over my old Dragonfly Black, now plugged into my PC) the Mk2 renders a large sound stage with excellent imaging. The Tin HiFi P1 was a very intimate experience via USB, and required a good 85-95% volume to sound good. The Mk2, is night and day. So much so that the P! is now my daily driver instead of being carried in case I wanted to listen to Adelle's "21" It pretty much excels at anything else you plug into it, I've tried the Tin T4, the QKZ VK4, the Shuoer Tape (electrostatic) the BLON bl03, the VIE Bonus earbuds and the ikko OH10 all of them sound better than they did on the Hidizs USB DAC. However it's the P1 that has changed the most. I really love what it does in the way of detail retrieval and vocal reproduction. I simply hear things with the P1 I don't hear with anything else. A minor note about the Little Bear Tube amp. Essentially the tubes are microphonic. This means that they will pick up local radio broadcasts, ( by local I mean "hyper local." GSM and Bluetooth in your pocket. etc.) You can get past some of this by keeping you phone in a different pocket.and getting a longer interconnect, from the Mk2 to the tube. Otherwise you get a constant low level intermittent tone during silence. It doesn't affect music, since any music drowns it out. However if you tube it, that's what you have to put up with. Why tube? It make the sound warmer, wider with more "air". If you're using a tube, just make sure Android and the Mk2 volumes are at max, then use the tube as the final volume control. This allows you to drive pretty much anything. With balanced, (the Little Bear is a balanced tube) giving you even more power if you need it. As you can no doubt tell, I'm really impressed with the Mk2. It's a truly fantastic bit of kit. Well worth the asking price, and if you're using a USB DAC, or you just want to make your phones Bluetooth enabled then this is the device to buy. Seriously good.

## Features

- The 24-bit Bluetooth receiver is designed to deliver studio-quality sound wirelessly through your ears - using your existing wired headphones, headphones or even speakers.
- Measures 1 x 2 x 0.5 inch, weight:20g, 14 hours continuous playback, special app with 10-band EQ and ambient mode, USB audio playback, device firmware update
- Includes 2 independent Hi-Fi DACs and amplifiers (Asahi Kasei AK4375a) - the optimal dual DACs/AMP design for both single-sided and fully differential outputs
- The analog volume control allows you to maintain optimal audio performance even at low volume with programmable amplifier (PGA), known for the best way to control the volume. The built-in microphone supports answering calls while using headphones without a microphone
- Max. Output power (idle): 1.1V (3.2V peak-to-peak) at 3.5mm unbalanced output/2.2V (6.4V peak-to-peak) at 2.5mm balanced output [Output impedance: approx. 1 ohm]

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B078H4YD2L |
| Additional Features | Noise Cancellation |
| Age Range Description | Adult |
| Audio Driver Type | Dynamic Driver |
| Battery Average Life | 14 Hours |
| Battery Charge Time | 2 Hours |
| Bluetooth Range | 10 Meters |
| Bluetooth Version | 5.0 |
| Brand | EarStudio |
| Brand Name | EarStudio |
| Built-In Media | Cable |
| Cable Features | Without Cable |
| Carrying Case Color | black |
| Carrying Case Weight | 50 Grams |
| Color | Black |
| Compatible Devices | Bluetooth-enabled devices, wired headphones, earphones, and speakers |
| Connectivity Technology | Bluetooth |
| Control Method | App |
| Control Type | Button Control |
| Customer Reviews | 4.4 out of 5 stars 1,940 Reviews |
| Ear Placement | In Ear |
| Earpiece Shape | Rounded Tip |
| Form Factor | In Ear |
| Frequency Range | 20 Hz - 20,000 Hz |
| Frequency Response | 40 KHz |
| Headphone Folding Features | In Ear |
| Headphone Jack | 2.5 mm Jack |
| Headphones Ear Placement | In Ear |
| Impedance | 1 Ohms |
| Is Autographed | No |
| Is Electric | Yes |
| Item Weight | 0.02 Kilograms |
| Manufacturer | RADSONE |
| Model Name | ES100 MK2 |
| Model Number | ES100 MK2 |
| Noise Control | None |
| Number of Items | 1 |
| Series Number | 1 |
| Specific Uses For Product | Music |
| Style Name | Black |
| Unit Count | 1 Count |
| Water Resistance Level | Not Water Resistant |
| Wireless Technology | Bluetooth |

## Product Details

- **Brand:** EarStudio
- **Color:** Black
- **Ear Placement:** In Ear
- **Form Factor:** In Ear
- **Impedance:** 1 Ohms

## Images

![ES100 MK2-24bit Portable High-Resolution Bluetooth Receiver/USB DAC/Headphone Amp with LDAC, aptX HD, aptX, AAC (3.5mm Unbalanced & 2.5mm Balanced Output) - Image 1](https://m.media-amazon.com/images/I/71o9zYwFOnL.jpg)
![ES100 MK2-24bit Portable High-Resolution Bluetooth Receiver/USB DAC/Headphone Amp with LDAC, aptX HD, aptX, AAC (3.5mm Unbalanced & 2.5mm Balanced Output) - Image 2](https://m.media-amazon.com/images/I/71lG3wJiXxL.jpg)
![ES100 MK2-24bit Portable High-Resolution Bluetooth Receiver/USB DAC/Headphone Amp with LDAC, aptX HD, aptX, AAC (3.5mm Unbalanced & 2.5mm Balanced Output) - Image 3](https://m.media-amazon.com/images/I/710lcDkvYXL.jpg)
![ES100 MK2-24bit Portable High-Resolution Bluetooth Receiver/USB DAC/Headphone Amp with LDAC, aptX HD, aptX, AAC (3.5mm Unbalanced & 2.5mm Balanced Output) - Image 4](https://m.media-amazon.com/images/I/51tyicSNi9L.jpg)
![ES100 MK2-24bit Portable High-Resolution Bluetooth Receiver/USB DAC/Headphone Amp with LDAC, aptX HD, aptX, AAC (3.5mm Unbalanced & 2.5mm Balanced Output) - Image 5](https://m.media-amazon.com/images/I/61JJW+Fi2nL.jpg)

## Questions & Answers

**Q: What happens if you plug in a headset that has a mic and/or controls. Do they merely not work, or do they cause problems?**
A: The music still plays but the mic and controls will not work. I verified this with a pair of Sony xb50ap. If you're only concern is music, you're good to go. Love the EarStudio btw, and plan to write a 5 star review soon.

**Q: Will EarStudio send AAC codec audio to my iphone 7/8/X?**
A: Hi there, yes, but in detail, ES100 supports AAC codec, and iPhone would stream audio to ES100 over AAC codec.

**Q: Will this be available for international shipping?**
A: Hi there, we are working on the FBA export. Hopefully it EarStudio will be soon available for international shipping. Thank you!

**Q: Can i connect the es100 in usb mode (connected to my pc) to my sony wh1000xm3 via bluetooth?**
A: You're trying to use this to connect a Bluetooth headphone to your PC? Nope. This isn't a transmitter. You'd use this to connect wired headphones to a phone or PC that can already transmit Bluetooth, or to connect wired headphones to USB (like, if your device doesn't have a headphone output or the built-in one sounds lousy). You need a USB Bluetooth adapter.

## Customer Reviews

### ⭐⭐⭐⭐⭐ So Far So Great!
*by I***F on March 13, 2018*

Updates on the Bottom I just wanted to add a quick review for now because I think this little device is fantastic and it’s a shame that more people don’t know about it. I will give it 5 stars for my first impression but will continue to update this review as I spend more time testing it. I have been looking for a Bluetooth solution like this for a while now and I had never heard of this company or this product before. Even after finding it on Amazon and seeing the impressive spec sheet, I was very skeptical that it was legitimate. What finally convinced me to give it a try was finding forums on it and seeing people’s experiences with it as well as seeing a strong presence from the company in the form of a representative from the company thoroughly answering questions. Although I’ve seen many pictures and the promotional video about this I wasn’t prepared for how small and lightweight this would be. The device looks very nice and has a simple but functional layout. One button to power on, power off, put into pairing, play, and pause. It also has a volume rocker and a back/next track rocker that is also used to turn on ambient mode. It was very easy to connect to my iPhone and get it up and running straight out of the box in a minute. I don’t want to get too much into sound, battery life, or the app because I haven’t had enough time to test any of them very much. I will say that it does sound great using the 3.5mm jack and AAC codec and I threw a wide variety of music at it. Previously the V-Moda Bluetooth was some of the best I’ve ever heard but I would say so far that this is noticeably better for me. The unit had 75% battery and while I haven’t tested to see if any firmware updates fix a battery issue, the app seems to show the battery life while the battery notification on my iPhone always shows 100%. I used it for an hour on 3.5mm high performance and it took me to 70%. I don’t think this is any real indication of battery life but will try to test it going forward in an update to this review. The app so far is fully featured and I added pictures of the app in this review. With only limited time in the app I will say that I really like the equalizer and the fact that it has a healthy amount of presets as well as what looks like customizable and savable presets but I will test this out more soon. I also briefly tried out the ambient mode and thought it was a very neat feature with a surprising amount of features. I don’t know how much I would personally use it but enjoyed playing with it and found the implementation well done. So far I have only tried it on two of my many headphones but it was a pretty wide range with the IE80S and the HD800S. While I expected it to drive the IE80S without a problem I didn’t expect it to drive the HD800S so well. To think I got that sound quality out of Bluetooth from my iPhone is just amazing and I do see a lot of potential to use my headphones with the ES100. It is a little too early to give any recommendation other than people should take notice of this little device because so far it is very impressive. I will continue to test the ES100 and update my review after a lot more use but if it holds up, I can definitely say it will be a deal at $100. [UPDATE] I’ve still only used this for a couple of days but I am very impressed with the sound this puts out. I’m using the balanced output now and it is hard to believe that this is Bluetooth. I’ve also tried to test the battery and although the battery indicator seems to be buggy, if it is anywhere near accurate the 14 hour estimation of battery life could be very accurate and that is with EQ on, volume at 50%, and using the 2.5 balanced output. [UPDATE 2} There has been a firmware update that seems to have addressed the battery life indicator issue. The ES100 has been working amazingly and it is still impressive how good the quality of the audio is. If I had to change anything about the ES100 it would be with the placement and style of the controls. They do work well but they could be a little better and easier to locate and press without looking. Overall this is a great device and is a must have for people looking for something like this.

### ⭐⭐⭐⭐⭐ A truly fantastic bit of kit.
*by G***E on January 17, 2020*

Tldr? Buy it! Seriously... I had/have the Hidizs Sonata HD II USB DAC, but it kept detaching in my pocket. and it made the phone unwieldy to use, as I had the DAC connecting to my Little Bear B4-X tube amp, and the phones connected to that. Now I have the phones connecting to the tube, but the tube connects to the E100Mk2, (Mk2) which connects via the Bluetooth LDAC codec to my Phone. OnePlus 7t running Android 10. On which I run USB Audio Player Pro (UAPP) which I have route audio to Bluetooth, which allegedly makes the signal cleaner before being sent to the Bluetooth receiver. I'm running in BitPerfect mode. Set Android volume to full to use the Analogue volume of the MK2 On ease of use alone, this is a winner, I can use my phone as normal. It has a phone pass through with a mic built into the Mk2, you can speak and be heard with the MK2 in your pocket. Functionally, it has twin DAC's and balanced output via 2.5" it drives the Tin HiFi P1 (Planar Magnetic) easily, and that is difficult to drive. I'm currently running 3.5" SE but some balanced 2.5" cables have just arrived from China. It also has a great full featured app. Allows you to tweak the roll off of the DAC live with music playing. So you can switch until you find one you like. It has a full EQ, (might be fixed parametric, not sure, not used it.) The battery charges fast by Mini USB. Lasts about two days of medium use. There is a little icon on the Android notification bar, that turns read when it needs to be charged at about 15-20% The button layout is good, with volume under the 3.5" output and power/action FF & RW under the 2.5" output. USB is on the bottom. Bluetooth wise it functions well with my Withings Steel Series HR smartwatch which is also always connected. Supports gapless playback, etc. It also integrates as a default headphone out, so it works with other Apps like Amazon Music HD, etc. All that aside, where it really shines is in how it renders music. With my Hidizs USB DAC, (which was an upgrade over my old Dragonfly Black, now plugged into my PC) the Mk2 renders a large sound stage with excellent imaging. The Tin HiFi P1 was a very intimate experience via USB, and required a good 85-95% volume to sound good. The Mk2, is night and day. So much so that the P! is now my daily driver instead of being carried in case I wanted to listen to Adelle's "21" It pretty much excels at anything else you plug into it, I've tried the Tin T4, the QKZ VK4, the Shuoer Tape (electrostatic) the BLON bl03, the VIE Bonus earbuds and the ikko OH10 all of them sound better than they did on the Hidizs USB DAC. However it's the P1 that has changed the most. I really love what it does in the way of detail retrieval and vocal reproduction. I simply hear things with the P1 I don't hear with anything else. A minor note about the Little Bear Tube amp. Essentially the tubes are microphonic. This means that they will pick up local radio broadcasts, ( by local I mean "hyper local." GSM and Bluetooth in your pocket. etc.) You can get past some of this by keeping you phone in a different pocket.and getting a longer interconnect, from the Mk2 to the tube. Otherwise you get a constant low level intermittent tone during silence. It doesn't affect music, since any music drowns it out. However if you tube it, that's what you have to put up with. Why tube? It make the sound warmer, wider with more "air". If you're using a tube, just make sure Android and the Mk2 volumes are at max, then use the tube as the final volume control. This allows you to drive pretty much anything. With balanced, (the Little Bear is a balanced tube) giving you even more power if you need it. As you can no doubt tell, I'm really impressed with the Mk2. It's a truly fantastic bit of kit. Well worth the asking price, and if you're using a USB DAC, or you just want to make your phones Bluetooth enabled then this is the device to buy. Seriously good.

### ⭐⭐⭐⭐⭐ Staggeringly Good! Worth. EVERY. Penny.
*by I***R on January 7, 2019*

Would rate 6-Stars if I could. If you're here because you REALLY love your wired headphones and don't want any of the current BT garbage, you're not alone and you've found your solution. If you want to get right to the advice, buy this BT-DAC right now and start enjoying full, beautiful sound, no artifacts, and a truly usable GEq and DSP. If you want more of the review, read on: First, I'm a...erm..."intermediate" audiophile. I'd never pay $100k for a pair of speakers nor $1k for interconnects, but my listening system is expensive and high-resolution and I know what that sounds like. In the past, I've used Shure IEMs exclusively. Apple decided to turn off ("it's a hardware issue" - is the BS line to get me to "upgrade") audio transmission to my lightning port, so I've been hunting for something satisfying for the better part of 6 months. I have AirPods - they're utter garbage if you like hearing the music you're playing. I have Bose 35s and they're passable, especially in the isolation department on aircraft or noisy locations, but the low and punchy-bass extension is anemic and if pushed, they distort (more on one ear cup, making it intensely annoying). The Bose 35s also lose effectiveness the moment you wear a baseball cap, sunglasses, or eyeglasses (an issue that IEMs don't summer in any way), they're clunky, and they're decidedly not sweat or water-resistant. Enter the EarStudio ES-100 to literally put my world back to normal. THE BAD: Me, personally: I can't find any major detractors currently - it's flawless so far as I can tell. The build materials might not be the very best, but it's $99, so I wasn't expecting aircraft aluminum. Others: The BT calling is not the best, but this thing isn't designed for that - it's for music and it's completely usable and clear - just some little artifacts on certain calls. THE GOOD: [Everything] Sound Quality = Excellent. It's probably not the most transparent device available, but it is damn good, rivaling my DragonFly Red with far more to offer in terms of control (see below) Power = Excellent. The amplifier(s) are powerful and offer punch that the iPhone simply doesn't have. DSP = Amazing. Companion App = Amazing. Control = Amazing. There's control over nearly everything, with clear explanations below the controls as to how they work and why. GEq = Amazing. The GEq allows you to save [at least 4] preset curves to match your different headphones or different musical genres. It's artifact-free so far as I can tell, and I've not gotten any clipping at all. This is HUGE, as different headsets have different sound signatures, even from the same manufacturer, and this is a one-touch solution to those differences, once configured (which is very easy). Bonus 1: The biggest issue with the iPhone is that you cannot apply an equalizer curve across all of your music services - it works for Apple Music, but not, for example, Pandora. The EarStudio's GEq completely fixes this issue, applying your chosen curve(s) across all outputs. Truly amazing the difference it makes. Bonus 2: The one detractor to IEMs and closed-back circumaurals (big "can" headphones) is that the isolation from the outside sounds might not be ideal due to safety reasons (work environment or driving in a car) or concern for children (whose voices you might need to hear). The DSP engine allows you to pull as much or as little ambient sound and integrate it to your sound stream! What does this mean? It means you can enjoy all of the isolation features of IEMs or closed-back headphones whenever you want but then make it so traffic noise, kids, or other environmental sounds come through - only when you want and only to the extent you want. Even better? There's a hot-button for this, allowing you to turn it on and off instantly. Imagine this: You're on an airplane enjoying music without engine whine. Someone taps you to talk, but your isolation is so good, you can't hear them. With the hot button (both a physical one on the body of the EarStudio and a virtual on on the companion app), you can instantly mix in the outside sound (one-touch) to hear it and then re-isolate again with another touch. You need not have less-isolating headphones or IEMs in order to safely or effectively (or selectively) hear outside sounds. Even on my Bose 35s you have to tap the isolation button twice to get this. In short, the sound is awesome, the controls amazing, and the thinking about usability and functionality are amazing. I thought I was going to get a bunch of chopped up Chinglish and a passable device, but...man, they got it so right. Bravo to the people at Radsone - this is one of the very best audio products I own.

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-05-21*