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You can only EQ speakers and headphones as far as the transducer can still respond accurately to the signal you're sending it. No amount of EQ will give the Sennheiser HD-600's good sub-bass performance because the driver begins to distort the signal long before you've amplified it enough to match the Harman target at a normal listening level.

DSP is a very powerful tool that can make terrible speakers and headphones sound great, but it's not magic.

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> You might lose headroom

Pretty much my first point… At the same time that same DSP can make a pretty mediocre speaker that can reproduce those frequencies do so in phase at the listening position so once again the point is moot, effectively add a cheap sub.

There is no time where you cannot get results from mediocre transducers given the right processing.

I’m not arguing you should, but in 2025 if a speaker sounds bad it is entirely because processing was skimped on.

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