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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.

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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.

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When we’re in the midst of a global calamity, it seems like the duty of every columnist to comment on it. As an audio writer, I can claim no special insight into COVID-19 or the economic effects it will have, but this episode did make me think back to the last economic crisis -- in 2008, the year I began my freelance writing career. When it comes to headphones, the technology of that era -- only 12 years ago -- now seems as primitive as the automotive technology of 100 years ago.

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Through the last several years, much discussion of headphone voicing -- how their designers tune the relative levels of the different audiobands to achieve their desired sound -- has centered around the Harman curve, the “target curve” shown to be preferred by most listeners. While the Harman curve is backed by the most extensive research ever done into headphone voicing, it’s still a long way from being a universally accepted standard, even among Harman’s own headphone brands. So we thought we’d ask some of today’s leading designers how they voice their headphones -- i.e., what their target curve is, how they arrived at that curve, and any other thoughts they might have on the subject.

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Fresh into a new year and a new decade, worn out from trips to the 2020 Las Vegas International CES and the 2020 NAMM Show in Anaheim, California, I write this column filled with anticipation . . . and dread. Anticipation because I’m excited to see what new headphone innovations will appear this year and into the 2020s. Dread because I’m wondering how I’m going to test them.

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Of the more than 100 new audio products that pass through my home every year, few stay longer than a couple of months. But after I tested a sample of the AKG K371 headphones borrowed from another reviewer, I immediately ordered a set from Amazon. Not only do they sound great; they’re a superb reference for any reviewer or headphone enthusiast. More than probably any other headphones available today, they tell us what sound most listeners like. The K371s’ response closely matches the Harman curve, developed by running hundreds of headphones past hundreds of listeners in blind tests to find out what kind of sound most listeners prefer.

Latest Comments

Rob Stivers 11 hours ago What is the Soundtrack to Your Life?
Love this article.  And couldn't agree more about there being no "correct" way to listen ...
Rob Stivers 19 hours ago Traveling as an Audiophile
@Geoffrey MorrisonMany will, but Delta doesn't. If you're an audiophile who travels, maybe you want to ...
Rob Stivers 19 hours ago Traveling as an Audiophile
@Geoffrey MorrisonActually, in most countries (215 of them) there's unlimited data at 256kbps.  I never actually ...
Geoffrey Morrison 1 days ago Traveling as an Audiophile
@Rob StiversI had T-Mobile for years. Overall it's very good. In most countries it's also very ...
Geoffrey Morrison 1 days ago Traveling as an Audiophile
@Rob StiversThis isn't the case with all airlines. Many will block streaming.
Rob Stivers 1 days ago Traveling as an Audiophile
On that flight to Salt Lake, I streamed Qobuz at high-res on my Hiby R5 ...
Rob Stivers 1 days ago Traveling as an Audiophile
Also...  I just flew to Salt Lake City and back on Delta.  Free wifi to ...
Rob Stivers 1 days ago Traveling as an Audiophile
By the way... T-Mobile users get free data while traveling internationally.  No problems streaming when ...
@oratory1990Yeah, I can hardly imagine it's an issue -- most people don't even turn their ...
@Doug SchneiderI fly quite a bit for work, and it was never an issue.  
Bluetooth can ...