https://play.google.com/store/apps/details?id=com.maxmpz.equalizer&hl=en_US Maybe? I use Wavelet for system wide. Amp15 in SG along with Wavelet and bass great along with micro details and wonderful large stage.You will disappointed in the amp 15 that comes with the 340 if you prefer heavy bass. You can eq it and it sounds great it’s a very detailed amp. It will not be a plug and play using the built in player. You will want neuron or power amp. If you stream, there is a solution for eq for that but I cant remember what it’s called. The factory eq in mango is not system wide. You will definitely want to get the amp 16 if you want a plug and play. In saying this I tend to lean more towards heavy bass and boosted treble. All of this is very subjective, listen devices make a big difference. I use the performer 8s and their very bass light to begin with. Just based on your comment you will want to do some tuning via eq. You will not however be disappointed with the player overall.
For others: I have to use BT while I am working with my phone and its like torture because DX340 sounds so much better. You can't mod the DAC chip but AMP can be. DAC in 340 is TOP NOTCH. Maybe AMP17/18 will improve this but Ibasso generally sticks to neutral tuning which is fine with me because EQ/PEQ can fix things to my preferences. IEM used will of course be a huge factor. Bass light IEM is not going to sound bassy. For SG yes get a power bank and/or LPSU. Grid power sucks for noises etc. 2 pounds (DX340 and portable power bank) is worth the awesome SQ with DX340. I keep both in a pouch and only wire that sticks out is IEM cable. Only place I won't take it is the beach because of the sand.