With a few rare outliers excepted, there are two different types of earphone drivers: dynamic drivers and balanced armatures. Although great earphones have been made with either type of driver, and often contain both types, the two drivers are very different in form and performance. Most headphone enthusiasts understand the concept of dynamic drivers, which are basically just miniaturized versions of conventional speakers, but many do not understand how balanced armatures work, or what their advantages and disadvantages are.
I think I just heard the future of headphones -- and I wasn’t really even listening to headphones. Technically, the product I was listening to is a PSAP, or personal sound amplification product: the Nuheara IQbuds2 Max, which I’m measuring for a technical publication along with some other PSAPs. The Nuheara IQbuds2 Max earbuds ($399 USD) are basically a set of true wireless earbuds with features added for hearing enhancement. Like many audio products that have come before them, the IQbuds2 Max earbuds seek to adapt their output to best suit the listener’s hearing characteristics. The difference is that this product actually seems to work.
My column last month, “The Biggest Lie in Audio,” sparked lots of commentary, but it also raised questions that are tough to answer. While most of the people commenting on the article here and elsewhere found it to be a welcome relief from what some have called the “faith based” approach of many audio publications, some weren’t so complimentary. A few derided science-oriented, “objectivist” writers as “narrow-minded” because they criticize audio products that don’t conform to generally accepted performance standards. Some insist that there’s no such thing as “accuracy” (they always put that word in quotes) in music reproduction, so audio writers have no basis on which to criticize outlier products.
You can’t get far into an audio forum or the comments sections of audio websites without encountering the statement “Some products that measure well sound bad, and some products that measure poorly sound good.” Depending on who said it, it’s at best uninformed and at worst a lie. And it’s a lie that sometimes sticks listeners with underperforming audio gear.
A decade ago, there was little consensus on how headphones should sound. With different brands -- or even different models of the same brand -- headphone enthusiasts rarely knew what to expect because they had only vague ideas of what was “right.” It’s a different world now, though. Thanks to scientific research (such as that behind the Harman curve), wider publication of headphone measurements, and more interaction between engineers at events such as the AES International Conference on Headphone Technology, good headphones have become common, rather than rare exceptions.
The direction of the headphone market used to be dictated by engineers with acoustical design expertise. But with Bluetooth headphones and earphones having taken over the mass market -- and all of them having at least a Bluetooth receiver and an internal amplifier, and likely a digital signal processor, too -- the chips inside the headphones now have at least as big an influence on the products as acoustical or even industrial design does. And the leader in those chips is Qualcomm -- partly because it owns the aptX audio codec, which audio enthusiasts consider de rigueur for any high-quality Bluetooth audio product.