The 7Hz x HBB Elua is very bassy with veiled 1-3k mids that push vocals far back, and their pair had a driver imbalance; they can't recommend it.
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iems
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First listen to the 7Hz Elua bought on sale: good punchy bass, nice mids without recessed vocals, non-sibilant highs and decent imaging.
The 7Hz Elua definitely needs EQ to sound good; they wouldn't recommend it in stock form.
Their 7Hz Elua sounds good out of the box with HBB tuning, but sounds off on any DAC that isn't neutral.
Their secondhand 7Hz Elua isn't very loud; even their KZ ZS10 plays louder from the same source.