Another problem I am having is the assertion the findings a single pair of speaker apply to the entire production of that make and model.
For example, He found the woofer in Vienna Acoustics Mozard Grand speaker to be bad. FR curves published by GR Research are very bad.
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Dave is selling the upgrade kits for this model, based on one pair of speakers he tested. The assumption/assertion seems to be, entire range of Vienna Acoustics Mozart Grand speakers are that bad. In my personal experience, they are very good speakers for the money and find it had to believe his findings apply to the entire production range of this model.
TAS Review contradicts with Dave's findings:
https://www.theabsolutesound.com/articles/mozart-grand-loudspeaker-1/Quote:
The Mozart Grands are very, very good speakers. They have one quality I’ve never heard before in loudspeakers in this price range.
I tend to believe, some poor chap got a defective pair and approached Dave to make it better. To market an upgrade kit based on one, potentially defective, pair of speakers is not the right thing to do, IMO.