Audio Science Guide

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Tyll Hertsens Posted: May 13, 2016 6 comments
In this article, we're primarily going to discuss the dynamic nature of the headphone driver as an electrical load on the amplifier driving it, which is expressed as impedance and is essentially additive to the resistance of the voice coil. Impedance is somewhat like resistance in that it can be expressed in Ohms, but it's quite different in that it is "reactive" and the impedance in Ohms can change depending on the frequency applied.
Tyll Hertsens Posted: Feb 09, 2016 23 comments

I was measuring some DIY headphones this weekend and got sucked into playing with filter paper in front of the driver. Thought all you DIYers out there would get a kick out of the data.

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Tyll Hertsens Posted: Dec 01, 2015 12 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?

Tyll Hertsens Posted: 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 Posted: 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 Posted: Jun 10, 2015 34 comments

Not long ago a reader asked me if I would experiment with how glasses effects headphone measurements. The dummy head doesn't have a nose...so I just taped them on. He won't mind.

Tyll Hertsens Posted: Mar 19, 2015 3 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 Posted: Mar 17, 2015 32 comments

In part one we will look at how the THD+noise plot is acquired and what it means. In part two we will look at a variety of measured data with an eye towards interpretation.

Tyll Hertsens Posted: Feb 21, 2015 28 comments

A bunch of concepts about how a target response is developed and what it might look like were introduced in Part One of this article. Here, in Part Two, we look at a variety of plots and make observations based on what we learned in Part One.

Tyll Hertsens Posted: Feb 06, 2015 33 comments

It's taken me a long time to feel like I had enough knowledge about this subject to attempt a serious overview. Lots more to learn, of course, but here's my current understanding of headphone frequency response measurements.

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Posted: Nov 18, 2014 51 comments
Dr. Jan Meier, of Meier Audio, recently submitted this article for me to consider publishing. He and I have had many a discussion, and quite a few disagreements, about the nature and effects of amplifier output impedance over the years. While I still have some concerns with his view brought to light here (I'll intersperse some of my comments in italics through the course of the article), I have moved away from the simple view that lower output impedance is always better. The following article does a lot to show a bit more sophisticated view of factors involved, and I thought it would be useful for InnerFidelity readers.
Tyll Hertsens Posted: 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.
Tyll Hertsens Posted: Aug 20, 2012 50 comments

Square waves are a cool signal. They contain lots of frequency response info, but, unlike the frequency response plot, also contain some visible information on the phase and time response of the headphones. I highly recommend them...

...but not for listening. Yeeeesh!

Posted: 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.

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MacedonianHero Posted: 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.

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