26. Sizes Audiofriends
The sizes at Audiofriends:
> The sizes are different from other manufacturers. How did that happen?
Audiofriends started with hobby revision even before the internet era became active (from around 1993). Audiofriends then involved the surrounds in an old-fashioned way via a drawing sent in by post in which the measurements had to be filled. You already understand, that was the same according to the drawing above.
Later, various suppliers of speaker surrounds came online. The sizes were slightly different. For example, where Audiofriends put size "C", most put "A" on the outer size of the speaker diameter.
Audiofriends had been around for a while, and it already had a range of surrounds. After consultation with various people, it was therefore decided, in order to avoid great confusion, to keep the measurements as used by Audiofriends from the beginning.
> Why is D (roll width) not equal to size B - A?
That's because measure D is measured from above, and sizes A and B from below. That's done, because only D on a speaker is only measured from above, and can be compared to the original.
Size D is B-A plus double the material thickness on site. In addition to the role, rounding also plays a role.
> Are the sizes actually 100% correct? Audiofriends often have a "±" sign on the bars!
Edge measurements are never 100% exact. This is because the surrounds are flexible. This makes correct measurement difficult anyway, also because the size can change slightly when mounting the speaker surround on the speaker unit. We usually offer flexible surrounds, where this certainly applies.
> Don't I get two different surrounds?
The surrounds are matched as much as possible per pair. This means that, if necessary, we send the edges as much as possible in pairs with equal dimensions. The edges, of course, come from the same mold.
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