FiiO K11 + Beyerdynamic DT150 250ohm — where's the bass?
Before anyone says "that's how they're meant to sound" or "just EQ it" — hear me out.
I've been producing music on and off for 20+ years. I know what the kick in Prodigy - Their Law (for example) should sound like. I know how the sub layers in Their Law should feel. LOUD in the mix.
Setup: PC (USB) → FiiO K11 → DT150 250ohm via 6.35mm, high gain. Filter 6
Mids and highs sound fantastic. Clean, detailed, great separation. But the bass? The kicks have no thump. The sub layers barely register. Songs I know inside out feel like they're missing their entire low end, like it's been cut off.
It's not the headphones — I played a deep bass boosted tests on YouTube and the sub frequencies came through fine, warm and thick with the correct rumble I expect from these headphones. (Edit: As mentioned below, the bass comes through fine via the motherboard output).
Also worth noting — the K11's line out into my Edifier R1855DB + T5 sub sounds great. Thick, warm, punchy bass. The DAC is clearly doing its job. It's specifically the headphone amp that seems to fall short with the DT150s.
I've tried every filter, every gain setting, checked Windows audio settings (full range speakers was unticked which I've now fixed), turned off all enhancements. Nothing brings the bass to where it should be.
I get that the K11 is "neutral" and "analytical" — but neutral should mean accurate reproduction of what's in the recording, not "missing the bottom end." E.g Liam Howlett didn't mix Fat of the Land expecting people to EQ the bass back in.
Anyone else experienced this with the K11 and high impedance cans? Genuinely curious whether this is a known limitation or whether people have just accepted it as normal.