I will never judge a phone by its frequency. DLC? I had two of them, CF Vegas and Atlas, great bass but that is all, so much so that you can even hear the bass anywhere from within the mid and treble range. Have you listened to the A8000? I own one for the past months. The treble is airy and sparkle and not too many phones can do that. Yes it is on the bright side but never sibilant to me. A8000 is musical, dynamic, fast, textural, great timbre, transparent, clear, clean, extremely quiet and black background, bass is tight, visceral, but only present when it is called for. I put the A8000 even higher than the Sony Z1R which I also have at present straightly bass on musicality and enjoyment.
Final Audio is one of the class act and finest company from Japan. They care about their products and will never just throw parts together (like many other products on the market) without doing research. I have used their product for over twelve years. The only iems that I still have from twelve years ago is their FIBASS, one of the best single BA driver iems on the market. Final has nothing to be ashame of in the A8000. They should be proud of being the first to release a pure Beryllium iems driver on the market. They constantly seek to lead in technology and innovation.