This made CAL! sound more capable and less cheap to me: ' Preamp: -2.6 dB Filter 1: ON PK Fc 220 Hz Gain -3.1 dB Q 2.000 Filter 2: ON PK Fc 420 Hz Gain 3.2 dB Q 1.200 Filter 3: ON PK Fc 830 Hz Gain -2.4 dB Q 2.000 Filter 4: ON PK Fc 2000 Hz Gain 0.5 dB Q 1.410 (optional for vocal presence)

I use this:thumbsup: https://www.amazon.com/-/en/dp/B094Y67C21

I keep coming back to the OG SRH440. With some light EQ they have a immersive thickness that's addictive.

The main issue is Beyerdynamics unit variation is known to be pretty high. It could work with individual measurements.

My theory is that it's not that the upper mids are too hot, its that the mid-bass is recessed. Try cutting 250Hz on the HD6XX and you will hear something similar.

Wanna hear a 8kHz peak try Beyer DT990. K371 treble is smooth as a baby's bottom by comparison.

Tried the updated K361 in a store, the headband looked visually redesigned and the clicks were very tactile. I haven't heard of a updated K371 yet. I got rid of mine and keeping an eye on the upcoming JBL Tune 710.

My current EQ Preamp: -2.2 dB Filter: ON PK Fc 32 Hz Gain 2 dB Q 1.41 Filter: ON PK Fc 64 Hz Gain 1 dB Q 1.41 Filter: ON PK Fc 125 Hz Gain -3 dB Q 1.41 Filter: ON PK Fc 250 Hz Gain -1 dB Q 1.41 Filter: ON PK Fc 500 Hz Gain 1 dB Q 1.41 Filter: ON PK Fc 1000 Hz Gain -3 dB Q 1.41 Filter: ON PK Fc...

More like a steal. People pay 3-5 times the price for other headphones with that feature.

3kHz is a frequency where the ear is very sensitive to change, cutting it will accentuate all frequencies around it. It would also sound similar to boost at 250Hz, try both and see which sounds best to you. I use constant Q because its accurate enough for non-individual measurements and...

10kHz dips not showing up in IEM measurements is expected because they bypass the pinna.

@ADUHF Source: https://www.reddit.com/r/oratory1990/wiki/index/faq#wiki_why_do_you_never_use_eq_to_remove_that_drop_at_around_9-10_khz_on_over-ear_headphones.3F

That's why I'm impressed by AKG K371. We will see if more headphones get released that compete in bass extension and low distortion.

Some headphone have a lot off bass roll-off. If you were to use that much gain to fully match harman in the sub-bass region, you'd have to listen for distortion, and back off when it starts sounding detrimental. Or use better cans that don't roll off or distort too much.

Awesome looking mod. The Sony MDR7506 headband is well built and comfortable. Nice to see it can be modded on to the SRH440.