If you're a beginner and don't fiddle with equalizers much, get the btr5. It's by far the most user friendly device.
However I would like to also suggest you the qudelix 5k. It has a parametric equalizer which will let you get the most out of your IEMs/headphones. It's not the prettiest but if you ever want to tinker with an equalizer to get the most out of your audio gear it's by far the best choice.
Is this to connect to a computer primarily? Or will you want to connect via your phone too? And if it's to a computer will you also want to plug in speakers?
I think to best answer the question, it would help to know the reason for your upgrade? Is there a specific problem that you want to address in the upgrade?
To give you an example, I will share the rationale in my DAC/amp purchases. My first one is a small portable Optima Nuforce (that is not in production anymore) as I noticed the DAC in my laptop was really bad. As a student, I wanted something portable that did not rely on needing wall power. Later on, I got passive desk speakers, and so needed to upgrade my amp to drive it well so went with a separate Schiit DAC and amp.
As you can see from my examples, I was solving specific issues which drove my decisions. What issues are you trying to solve? Or do you just want to try something better?
If you're a beginner and don't fiddle with equalizers much, get the btr5. It's by far the most user friendly device.
However I would like to also suggest you the qudelix 5k. It has a parametric equalizer which will let you get the most out of your IEMs/headphones. It's not the prettiest but if you ever want to tinker with an equalizer to get the most out of your audio gear it's by far the best choice.
Is this to connect to a computer primarily? Or will you want to connect via your phone too? And if it's to a computer will you also want to plug in speakers?
I think to best answer the question, it would help to know the reason for your upgrade? Is there a specific problem that you want to address in the upgrade?
To give you an example, I will share the rationale in my DAC/amp purchases. My first one is a small portable Optima Nuforce (that is not in production anymore) as I noticed the DAC in my laptop was really bad. As a student, I wanted something portable that did not rely on needing wall power. Later on, I got passive desk speakers, and so needed to upgrade my amp to drive it well so went with a separate Schiit DAC and amp.
As you can see from my examples, I was solving specific issues which drove my decisions. What issues are you trying to solve? Or do you just want to try something better?