An intruiguing paper was published in May 2015 that apparently discusses the science behind AKG's latest $1500 flagship and possibly the latest JBL Everest headphones. I'm surprised that there's been absolutely no press for the paper and not much more for the headphone (get on this Tyll!).  ...

At CES 2015 Harman announced their new AKG90Q, with an intriguing, perhaps revolutionary, feature:     Given the recent research Harman has been doing in headphone target frequency response curves, my guess is that the system will actively apply DSP to equalize the target response (to one...

There's been some recent discussion over in the Sound Science forum about new research on the measured and subjective response of headphones, including a revelatory paper (summarized here) on the subjective impressions of equalized frequency responses.   I've been doing a bit of measurements...

Sean Olive, Todd Welti, and Elisabeth McMullin of Harman have recently published another intriguing paper in subjective headphone sound quality. Following their previous paper "Relationship between Perception and Measurement of Headphone Sound Quality" discussed in this thread, they have...

In the thread in this forum on the AES2012 paper about perception and measurement of headphone sound quality, I asked the Harman research team whether they have considered measuring desired headphone frequency response using loudspeaker playback on a dummy head as reference, similar to what is...

An interesting paper from Sean Olive of Harman (AKG) is set to be published at AES2012 in a couple weeks that should be of great interest to folks in this forum:   http://www.aes.org/events/133/broadcast/?ID=3181 ------------------------ P10-1 The Relationship between Perception and...

Are there any good storage/display solutions out there for large headphones? I have my amp/headphones on a desk at the office, and when I'm done I want to put it in a box so it won't get dusty and the wires wont be all over my desk. Currently I'm using a $3 box from walmart to store $1400...

I'm seriously considering getting HD800's, and my decision will be based entirely on the member reviews of this forum. However, I have a hard time sifting through literally thousands of posts spread across two ginormous threads. Can we please have a thread of only impressions and reviews from...

I've always found my PPA to sound shrill and metallic, but couldn't figure out why. I thought maybe I screwed something up, but it seemed to measure well, as on tangent's site. Recently I did another comparison using RMAA5.4, and I noticed one measurement, THD, in which the PPA measures worse...

I built my PPA about 3 months ago, using basically the standard recommended configuration/parts. I always thought it sounded a little thinner than my META42 (also built to standard configuration/parts), but figured it was due to the improved stereo separation. I hadn't done a serious subjective...

I'm building a PPA and I want to have 2 sets of input RCA jacks. Is it OK to tie together all the input grounds and switch only the signals with a DPDT switch? I intend both inputs to come from home stereo components. Would this cause ground loop problems and such? I'm using the Hammond case...

I found some great computer speakers for $30 that I thought I'd share with you guys. I never liked the 3-piece satellite/woofer systems because the frequencies around 100-200 hz cannot possibly be adaquately covered by either the woofer under your desk, or the little single-driver satellites...

My fake ALPS stepped attenuator makes the speakers/headphones pop when turning. Sounds like it's a break-before-make type. Can I stop this pop by wiring a resistor (say 500Kohm) in parallel, and would there be any bad side effects from doing this?

I have a stock META42 in a Hammond case, and it works fine without any audible hiss/hum using headphones. When I try to use this thing as a preamp I get a buzz that sounds like a 60hz hum, and also some hiss. Is this a ground loop problem, and how can I fix it? I'm using a fake ALPS pot. Does...