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Re: And there's the whole problem

Naw, I didn't say that, you did.

In those instances, we have professionals, who, for the most part, know what they are doing, and take every step and precaution to MAXIMIZE the sensitivity of the listening test, doing their best to get as much useful data as they can. What would be the point of conducting a half-assed codec test, only to find out later on, the codec sounded like dreck to many poeple with discerning tastes? There is MONEY involved, and money spent on these efforts, they would not only be remiss to conduct a lousy test, they would probably be fired!

It would be interesting if we could get jj to tell us HOW MUCH a single well conducted DBT session costs (in round numbers), even though they had a dedicated set-up on call to do it. Once you factor in the cost of obtaining or renting the facilities, the sound playback equipment, the measurement gear, the acoustic treatments, etc., the cost of compensation for the listening subjects (who MUST be trained, or the whole thing is a sham)I think you would find that the cost is staggering on a per session basis for any one BUT a dedicated department of a major corporation to conduct professional and well executed DBT's on a regular basis using purpose built dedicated facilities.

Anyway, I don't preface or append every post that I make about DBT's to indicate that they are primarily concerning the amatuer ones, not the professional ones, like they do for codecs.

The ones that cause all the trouble are the ones that have been done haphazardly over many years, often with significant flaws or procedural errors (see: A discussion of selected ABX/DBT issues:
http://www.audioasylum.com/forums/prophead/messages/2190.html
http://www.audioasylum.com/forums/prophead/messages/2579.html
http://www.audioasylum.com/forums/prophead/messages/2580.html



Jon Risch

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