Few people (really) understand what is going on in the picture above.

However, most people agree that we see a hand dosing something on the edge of a speaker membrane....

Then most people get off.

But people who REALLY know speakers know that this handwork removes a resonance that occurs in the transition between the diaphragm and its rubber suspension.

The arrow points to a resonance that can occur in a loudspeaker membrane, making it impossible to understand a lyric

So what, people say. Is handwork useful?

It certainly does ..... and that's not even the slightest bit odd.

You probably know the song "Get lucky" by Daft Punk.

Yes, you do.

You also know the most famous part of the song's lyrics?

Here, many believe that Daft Punk sings the same song over and over again.

But they don't.

That's because many, many, many speakers aren't good enough at reproducing different words, so the words sound the same.

And we don't understand what they're singing.

The image with the handwork means that it becomes much clearer that Daft Punk is singing:

We're up all night till the sun

We're up all night to get some

We're up all night for good fun

We're up all night to get lucky

 SA pandion 30 is one of the speakers that has the hand-built detail. See it here.