Always an interesting question ... When dealing with sound, people are often surprised at how "high" certain notes are ... most people will consider a 1000 Hz note to be "treble" ... and a 10,000 Hz note is REALLY high.
I could easily see how, at 4000 Hz, a room interaction combined with the inherent "peak" in the VP-150 could cause a feeling of "screechy treble" ...
Then there is the placebo effect ... we read something about, say, metal drivers ... next thing, we are HEARING what we read ... blind tests tend to fiz that ... more later, someone is ready to go to dinner ...
