They are technically the same. Just that the difference comes in the batch/version differences. Which can lead to either the MH755 being bassier or the MH750.
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If you eq up the bass on a Letshuoer S12, you can push literally 12-20extra db of subs into that thing and will annihilate almost any iem in its path. I got myself literally sick quite a few times. Wild stuff.
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Maybe your first hybrid? Planar for the lows, plus a full range DD? 
(put a brutal crossover in there to lift the planar bass, and don’t give a damn about the sensitivity spec 
)
That would be for elephant ears.
Works really well in the craftears Omnium. 1 x 9.2 mm dynamic driver + 1 x 10 mm planar magnetic driver + 5 balanced armature drivers. 
aaa yeah those are the round “planars”. Thought u meant the (“real”) ones around 14mm, those are quite a bit bigger.
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