What does the term "Speed" mean in a speaker?

I think it falls into what the Brits refer to as PRaT - Paced Rhythm and Timing. Of course Prat is also British slang for:

1. an incompetent, stupid, or foolish person; an idiot.
2. 2. a person’s buttocks.

I supposed this is another dumb joke.  Maybe you're number 1?

"You can't be serious."
https://www.thefreedictionary.com/read+between+the+lines

Don't get out much? Sorry, couldn't resist.

"Maybe you're number 1?"
https://en.m.wikipedia.org/wiki/Snowflake_(slang)#Generation_Snowflake

Oh my, are you one of these? If not, refer back to above.

Interesting discussion. +1 on many posts. Nods to @simonmoon and similar posts and to @mikelavigne ’s points.

Adding an aspect that hasn’t been brought up...reduction in system noise.

I personally believe that the speed of bass tends to be slower than the highs because it can take longer for the waves to start energising the air due to their longer wavelengths. YMMV

"You can’t be serious."
https://www.thefreedictionary.com/read+between+the+lines

Don’t get out much? Sorry, couldn’t resist.

"Maybe you’re number 1?"
https://en.m.wikipedia.org/wiki/Snowflake_(slang)#Generation_Snowflake

Oh my, are you one of these? If not, refer back to above.

1. Stop wasting people time.
2. Stop making dumb post.
3. Maybe you should get out ... of here lols.