Originally Posted by arnyk
What we are looking for is not typical measurements and specs, but enough measurements and specs to compare and recommend speakers.
Looking at http://www.bambergaudio.com/products/series6/s6mtmw_specs.pdf
Nothing about nonlinear distortion at all.
I find no impedance curve.
Nothing about vertical dispersion that I can see.
No waterfall plots.
Thank you for what you have provided.
My post was in response to 1) the issues of voicing and coloration, and 2) how a manufacturer takes on a certain level of risk by posting measurement curves. I used the SPL curve as the obvious example to relate the two.
Even the list of basic specs published may not only be incomplete, but sometimes a single spec itself is incomplete and misleading. Sensitivity is one that comes to mind – the subject of this number alone is quite in-depth. (I probably address questions on this a few times each year.)
Because I learned that specs and curves are so often misinterpreted and/or misunderstood by audiophiles, I created a web page dedicated solely to this subject. http://bambergaudio.com/technical/interpreting-specs.php
I choose to post the set of specs and curves that I consider are necessary to characterize the basic technical performance of the speaker. My corporate clients usually adopt my specs format.Nothing about nonlinear distortion at all.
Distortion testing can be a career in itself. The resulting data is more dependent on the acoustic environment, specific test equipment, and method more than just about any other measurement. Therefore it is not trivial to compare one manufacturer’s data against any other – and this applies to experts!I find no impedance curve.
The Series 6 speaker is active tri-amp, and so the impedance curves would be of the drivers alone. All my other product pages include the impedance curve.Nothing about vertical dispersion that I can see.
Another perfect example of a risky curve to publish. If I publish this curve family, and the -30° curve shows a sharp SPL dip, I will be suspected of not knowing what I am doing. And yet every other speaker brand (with the same design format) will also show this dip. It is an acoustic cancellation due to time delay between the midrange and tweeter and thus cannot be compensated in the crossover. If it were attempted to be compensated for, then yes, the power response might be a little smoother, but in a well-treated room that same dip band will instead become an obvious “shouty” one. (This is a great example of improving the measured performance at the expense of degrading the perceived sound.)No waterfall plots.
See my response about distortion. I also acquire excursion curves, and panel vibration curves. I choose to use them to improve my product, and yet not publish those.
It comes down to publishing certain measurement data gives rise to criticism more often than praise. It is akin to having information you provide being used against you. By contrast, listening impressions from customers, reviewers, at shows etc, is subjective. Therefore it is not at risk for misinterpretation – it IS the interpretation.
I get feedback asking for more published technical information. I get equal amounts of feedback cautioning against appearing too technical.