word meaning?

[detailer]

Hi all, quick question.
When building/picking a sub box style,

QUESTION>"What does the word (RIPPLE) mean?"

These specs came with a little 10inch woofers instructions.
This is for sealed box.
F3: 55Hz
"RIPPLE: 0.07db

This is for a ported box.
Tunning Frequency: 38Hz
F3: 38Hz
"RIPPLE" 1.35db

I hope you all can understand my question.

[detailer]

YA, That word "RIPPLE" threw me off to.
THANKS ANYWAYS!