Given that the isodynamic drive unit has thrived in loudspeakers, most memorably in the giant Infinity IRS which incorporated no fewer than 48 such drivers per channel, it's odd that the technology hasn't enjoyed an equivalent status in headphones. Until recently, reference to an isodynamic headphone would have cast my mind back 40 years to the early 1970s' Wharfedale Isodynamic [see boxout] - a headphone I lusted after as an aspirant teenager but which did not spawn a host of imitators.
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