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It is incredible how stupid sometimes our audio steps are.  A few days ago I was complaining that sound of my T350 tweeter suddenly started to bother me but it was no the problem with the tweeter but rather the problem with my own moronity.

A few months ago I implemented a transaction slope attenuator. It was basically a pile of capacitors sitting in a good quality rotary switch. That allowed me very precisely to dial-in the attenuation of my tweeter. I tuned in my tweeter (it was a step #6 on the rotary switch) and then sine I dissemble my entire tweeter assembly I time-realigned the tweeter.  I was so pleased with the result that I made a post: “Something that a loudspeaker must have.” in my “Audio For Dummies ™” section:

http://www.goodsoundclub.com/TreeItem.aspx?PostID=1487#1487

Since then I have been using the depicted configuration, playing the tweeter all time in the in step #6 and turning it down when electricity is bad.

Well…

although I do not argue with the concussions of that post and do find that an ability to precisely set tweeters amplitude is very important and powerful tool but when I look at THE WAY HOW I did it is really question who is the Dummy!!! I juts realized that THE WAY in which I did it was so much bogus that it is scare. Running the tweeter across the transition slope I unavoidably introduce in each new “click” a new phase offset. It means the correct position of the tweeter relative to MF driver (or angleing of the tweeter) would be different at the different “clicks”.  I spent a few hours confirming that my tweeter was misaligned but I failed to acknowledge that my attenuator was not in the #6 step. This perfectly explains the “mud” and “fussiness” that I experienced. At this point the attenuator was in position #6 and after I moved the teeter a few mm forward then the problem is gone and the tweeter sounded as perfect as before. How much was my surprise when later on during the same evening I moved the attenuator to the default step #6 and begin to hear the same “fussy dirt”.  Of coursed I immediately re-measured the time aliment and off course I was deep in cancellation mode…. What else I was expected ands what the hell I was thinking!!!

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