Audio Science Guide

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Posted: Jun 28, 2016 6 comments
I arrived at Harman International Northridge at the appointed time of 9 am, sharp. After being conducted to the Harman Reference Room, I found Tyll Hertsens already busily setting up his gear, focused on collecting all the necessary interconnects to begin his Head Acoustics simulator measurements. Tyll's next stop was T.H.E. Show, Newport later that day and he didn't want to waste any precious time.
Tyll Hertsens Posted: 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.
Posted: Jun 10, 2016 22 comments
I'm up against a bit of a wall here as I'm going on vacation next week—John Grandberg will have a headphone amp review going up, so stay tuned—so I haven't been able to do all the number crunching I'd like. None the less, I'm far enough in to provide some cool graphs of the results so far.
Tyll Hertsens Posted: 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 Posted: May 13, 2016 7 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 22 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 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?

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 34 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 52 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.

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