Audio Science Guide

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Tyll Hertsens  |  Nov 17, 2015  |  19 comments

Curiostity sometimes gets the better of me and I've got to take a good hard look at something. In this case, the Bakoon HPA-21 current source amplifier, and how it's different than a voltage amplifier.

Tyll Hertsens  |  Nov 24, 2015  |  14 comments

I spent all day yesterday measuring the two different pads with four filters each of the Torque t402v headphone.

Some things just don't go as expected.

Tyll Hertsens  |  Mar 19, 2015  |  4 comments

You know things are happening when industry decides to settle on a standard. In this case, the AES has settled on a standard file structure for providing portable player (smartphone, tablets, DAPs) software programmers access to HRTF and other complex audio virtualization data sets.

Tyll Hertsens  |  Dec 01, 2015  |  13 comments

In an ongoing effort to investigate current source amps I did some initial measurements of the Apogee Grove, which is supposed to be immune from frequency response changes to headphones with varying impedance.

Care to guess whether or not it works?

Steve Guttenberg, Tyll Hertsens  |  Apr 25, 2012  |  42 comments

I talk with Steve Guttenberg on the phone a few times a month, and I very much enjoy our chats. When Steve suggested we have a conversation about measurements and their relevance to audiophiles and write it up as an article, I was all-in immediately.

I hope you enjoy our chat as much as I did.

Tyll Hertsens  |  Jul 30, 2014  |  43 comments
A short film from Audio Precision demonstrating the current state-of-the-art for headphone measurements does a good job of showing why we need the work being done at Harman to improve a standardized headphone target response curve.
Keith Howard  |  Aug 29, 2008  |  0 comments
Headphones get pretty short shrift in much of the hi-fi press, which is puzzling—the headphone market is burgeoning. I don't know what the equivalent US figures are, but in recent years the UK headphone market has increased by an annual 15–20% in both units sold and overall revenue. It's easy to dismiss this as a natural byproduct of the Apple iPod phenomenon, but 20% of the market value is now accounted for by headphones costing over $120; a significant subset of consumers would seem to be looking for quality. When you also consider that many people's first exposure to higher-quality audio comes via headphones, there is ample reason for treating them more seriously.
Tyll Hertsens  |  Jun 09, 2011  |  35 comments

Many of you will remember my previous attempt at analyzing break-in from this post. A lot of good comments and suggestions were made after the post, and I'd encourage those not familiar with this previous attempt to check it out.

Deciding that my time away at T.H.E. Show Newport would be the perfect opportunity to run some more break-in tests, I programmed my headphone measurement system to take frequency response, square wave, impulse response, and Total Harmonic Distortion data every hour for 100 hours.

Man! That's a lot of numbers ... I'm glad I have a computer.

Tyll Hertsens  |  Apr 24, 2011  |  62 comments

The nice folks over at AKG decided to send me a bunch of Quincy Jones headphones, including three Q701s! That's good news for both you and me. For me, because it will allow me to do some experiments I've been wanting to do for a long time. The AKG K701, now reborn as the Quincy Jones Q701, is notorious for needing hundreds of hours of break-in before they sound right. I want to see if that can be measured, and in this article I'll show you the first sets of measurements.

It's good news for you, because when all is said and done, I'll give away two pairs of the Q701 headphones to some lucky reader.

So, let's talk about break-in, shall we...

MacedonianHero  |  Mar 28, 2012  |  28 comments

Head-Fi member Macedionian Hero may be a headphone geek by night, but he's the Director of Engineering at a MIL/AERO electronics manufacturing firm by day. He's also a "Lean Six Sigma Black Belt" (don't know what he had to do to get that, but I bet there's a lot of math), and one of his specialities is characterizing the the precision and accuracy of electronic systems. He volunteered to evaluate the precision of my headphone frequency response measurements.

Did some nail biting over this one, I tell ya.

Tyll Hertsens  |  Jun 25, 2016  |  39 comments
I don't think I'd make a very good researcher. I get too pissed when the numbers don't look like I'd like. Guess that's why so many engineers are less in touch with their feelings than the average Joe. Oh well, here we go.
Tyll Hertsens  |  May 30, 2016  |  23 comments

Thursday I will be at Harman's research laboratories to measure what my head hears when in front of a very highly calibrated speaker system. It's an effort to drill into the measurements and, slowly but surely, come to a better understanding of what's going on.

Tyll Hertsens  |  Dec 27, 2011  |  26 comments
At it hot and heavy in the lab setting up amp measurements. Started with Total Harmonic Distortion + Noise vs. Frequency tests. Sent electrons whirling through a handfull of amps to see what the numbers said.

Wanna see?

Tyll Hertsens  |  Apr 16, 2011  |  31 comments

Measuring what a pair of headphones sound like inside you head is no simple task. It's complicated in there.

No worries, in this article I'll take you step-by-step through the process of measuring the frequency response of a pair of headphones.

Tyll Hertsens  |  Apr 15, 2011  |  16 comments
Measuring headphones is a long and involved process which includes elaborate costuming, waterboarding cats, and just the right wand.

:)

No ... not really. Nothing quite so spectacular as that, but it's still pretty cool. In this article, and the series it begins, I'll take you step-by-step through the process of measuring a pair of headphones.

No pets will be hurt ... I promise.

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