Is Imaging Worth Chasing?


Man, am I going to be torn apart for this. But I says what I says and I mean what I says.

Here’s a long term trend I’ve noticed in the audio press. Specs that used to be front and center in equipment reviews have essentially disappeared. Total harmonic distortion, for instance. Twenty years ago, THD was the start and end of the evaluation of any amplifier. Well, maybe power, first. Then THD. Armed with those two numbers, shopping was safe and easy.

The explanation for the disappearance is not hard to figure. Designers got so good in those categories that the numbers became meaningless. Today, most every amp on the shelf has disappearingly low distortion. Comparing .00001 to .000001 is a fool’s errand and both the writers and the readers know it. Power got cheap, even before Class D came along to make it even cheaper. Anyone who tries bragging about his 100 watts will be laughed out of the audio club.

Stereophile still needed to fill it’s pages and audiophiles still needed things to argue about so, into the void, stepped imaging. Reviewers go on and on about imaging. And within the umbrella of imaging, they write separately about the images height, width, and depth. “I closed my eyes and I could see a rock solid picture of the violas behind the violins.” “The soundstage extended far beyond the width of the speakers.” And on and on.

Now, most everyone who will read this knows more about audio equipment than me. But I know music. I know how to listen. And the number of times that I’ve seen imaging, that I’ve seen an imaginary soundstage before me, can be counted on my fingers. Maybe the fingers of one hand.

My speakers are 5-6 feet apart. I don’t have a listening chair qua listening chair but I’m usually 8-9 feet back. (This configuration is driven by many variables but sound quality is probably third on the list.) Not a terrible set-up, is my guess from reading lots of speaker placement articles. And God knows that, within the limited space available to me, I have spent enough time on getting those speakers just right. Plus, my LS50s are supposed to be imaging demons.

I’ve talked to people about this, including some people who work at high-end audio stores. Most of them commiserate. It’s a problem, they said. “It usually only happens with acoustic music,” most of them said. Strike one. My diet of indie rock and contemporary jazz doesn’t have much of that. “You’ve got to have your chair set up just right. And you’ve got to hold your head in just the right place.” Strike two. Who wants to do that?

(Most of the people reading this forum, probably. But I can’t think of any time or purpose for which I’ve held my head in a vise-like grip like that.)

It happens, every now and then. For some reason, I was once right up next to my speakers. Lots of direct sound, less reflections. “The Name Of This Band Is Talking Heads” was playing. And I literally gave a start because David Byrne was standing on the coffee table. Cool.

But, generally speaking, imaging is something I only read about. And if that little bit of imaging is the dividend of dropping more money into my system, I’m not sure that I want to deposit into that account.

I think that I still have a few steps to take that will pay benefits other than imaging. But maybe the high-end is not for me.

paul6002

      Whenever imaging or soundstage are mentioned, I like to remind people about these resources: The following provide tests, with which one may determine whether their system actually images, or reproduces a soundstage, as recorded. ie: On the Chesky sampler/test CD; David explains in detail, his position on the stage and distance from the mics, as he strikes a tambourine(Depth Test). The LEDR test tells what to expect, if your system performs well, before each segment.

         Online test: https://www.audiocheck.net/audiotests_ledr.php

         Chesky CD: https://www.ebay.com/p/4046056409

      The shape of your ears’ pinnae is also a variable, regarding your ability to perceive images/locate sounds. A Stereophile article, that explains the LEDR test: http://www.stereophile.com/features/772/

There is another page on the audiocheck site @rodman99999 that shows you left / right using level, time, and time, level and frequency response.  @paul6001 you asked "how it works", this is how:  https://www.audiocheck.net/audiotests_stereophonicsound.php

Really important point hidden at the bottom of the page:

This now explains why the audio engineer only needs a pan pot on his console: from all the effects described here, only panning offers the highest compatibility with all existing sound reproduction systems, from monaural speakers to complex multi-channel installations, and through headphones.

I think the only thing missing here is that our brains place more importance on the first sounds that arrive. That is why it is important to get those reflections under control, and the level, like @mijostyn said, get the left / right matched, but don't confuse equal left and right speaker room responses for matched. What reaches the left and right ear from the left and right speakers must be matched.

Tone, clarity, and room ambience come first for me. Imaging is in last place, but not by too far. I'll sacrifice a little of the others if necessary to get better imaging but there's a threshold for all these perceptual metrics before I start to become dissatisfied. 

@thespeakerdude , all I can say is wait till you hear a system that really images. I can only hope you do as they are not very common. 

@secretguy , there is only one line where proper imaging is attainable and it travels perpendicular to the inter speaker axis exactly mid way between the speakers unless you use tricky digital signal processing, then you can put that position anywhere. If you think your system images otherwise then you have not heard a system that really images. Most expert listeners can locate that position by ear within an inch.  

@mijostyn systems that image are very common. Almost any near field system with good quality monitors will image very good if setup right, and with most of the market moving towards active monitors, left/right matching is near perfect. If near field systems did not image well, almost none of the music you have would as that is what was used to mix and master it.