Let me explain.
As I’m sure you know, the most popular speaker set in our industry is the 6-and-tweeter. Due to the lack of actual standards in our industry, sometimes it’s called a 6, sometimes it’s called a 6.25 or 6.5, sometimes it’s called a 6.75, sometimes a 165mm - but this 6 paired with a tweeter is the most common speaker set in our industry.
We have examples ranging from under a hundred bucks to literally thousands of dollars (American!) When it comes to component speakers, I estimate 75% of all units sold are 6-and-tweeter sets.
So, what’s wrong with them?
In the Educar classes, I talk about two principles of speaker operation which I have grandly dubbed the Law of Excursion and the Law of Dispersion - and each of these laws combine to wreck the performance of the 6-and-tweeter set in OEM locations.
First, let’s talk about the Law of Excursion. It tells that if you want a speaker to play an octave lower, and play at the same output level, it will have to move 4 times as far. (It doesn’t apply to vented enclosures, which minimize cone motion at the tuning frequency.)
So, let’s assume we are playing a 1k note -  at a given output level, that requires cone motion of 0.1mm. Now, a tenth of a millimeter isn’t a cone motion you’re going to see with a six-inch speaker. You could put your finger on that cone and feel it hum, but if there was a logo on that dustup, you wouldn’t even see it ...

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