Now you got lots of useful tips and recommendations.
First you should be able to PEQ your music. There are some options for applying PEQ depending on the hardware that you use for streaming. For example EAPO on a pc/laptop. Or you can use a DAC/Amp that is PEQ capable.
With the capability of PEQ you could first EQ your DT880 and see if you get the improvement you are looking for (here a link to
DT880 measurements). Oratory gives further information which filters should be adjusted for your personal preferences.
View attachment 474509
After PEQ your DT880 and in case you still want to replace the DT880 there are several options at certain price points.
Up to 400
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Hifiman Sundara 220
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Sennheiser HD490 Pro (incl. mixing and producing earpads) 350
Up to 700
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Hifiman Edition XS (if you don't care about the bratwurst headband) 270
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Hifiman Arya Stealth 600
Up to 1500
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Dan Clark Audio Noire X (geschlossen) 1100
- Dan Clark Audio Noire XO (offen) 1400
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Sennheiser HD800S 1400
If you want to spend that amount of money you could go with HD800S (1400) or Dan Clark (1100-1400). The Hifiman Arya (600) and Edition XS (270) are nice options too. I suppose the difference in sound between the Arya and Edition XS is not very big. But I am not a fan of the bratwurst headband of the Edition XS.
Recommended DAC/Amp combos. You mentioned in your first post the RME.
- Topping DX5 II (300)
- RME ADI-2 DAC FS (850)
- RME ADI-2 Pro FS R (1600)
The RMEs have very advanced DSP features (for example crossfeed, loudness, PEQ) compared to DX5II plus the RME ADI-2 Pro has additionally balanced headphone output, balanced/unbalanced analog input. And the remote control is good compared to the very basic of the Topping.
The Topping is a very powerful DAC/Combo with PEQ features. It's very attractive at it's price point. The remote control is very basic. If it has all the features that you need, it could be your choice.
If you are interested in IEMs....
There is a long list of possible driver combinations used in IEMs (single DD, dual DD, single Planar, 1DD+3BA, 2DD+2BA+2planar, 1DD+1Planar+PZT etc.). The more complex the configuration is, the more it looks attractive on paper and from a marketing perspective but finally a good implementation makes an IEMs to sound "good" and not only number of drivers or driver types. Multiple drivers in an IEM can have advantages but not necessarily. The planar only has not an advantage over other concepts.