srkbear, when comparing E3 to your other headphones the only EQ that you applied all the time was built in xBass button in your dac/amp?

If so, perhaps you could get closer to your preference curve by applying half or less xBass boost manually with a low shelf filter (since E3 already has 5.5db Harman curve boost built in)?

Oratory wrote that Low-Shelf at 55Hz with +12.3dB and Q 0.65 gets very close to xBass: "a lower Q-factor (e.g. 0.5 or 0.6) will shift some of the subbass energy into the lower mids, and a higher Q-factor (e.g. 0.7 or 0.8) will do the opposite and shift some of the lower mid energy into the subbass."

So perhaps +5 or +6db low frequencies boost should be enough for E3 in your case?

"This gets you within 0.1 dB of the XBass curve."

Filter Type | Frequency | Gain | Q-Factor |
---|

Peaking | 36 Hz | 1.4 dB | 2.00 |

Peaking | 47 Hz | -3.6 dB | 1.40 |

Low Shelf | 52 Hz | 6.5 dB | 0.71 |

Low Shelf | 80 Hz | 5.8 dB | 0.58 |

(but I don't know how to recalculate values for 4 filters to get only half of xBass, so with a single low shelf it will be easier, though a bit less accurate)