Why -3dB? (An alternate approach to explaining dBs)

Why is there specifically a -3db point chosen for frequency response?
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Why is the dB-definition sometimes 10*log(x) and sometimes 20*log(x)?
If you ever wondered about some of the mysteries about the decibel, this tutorial is for You
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[@elguaripolo686]

If a deci-Bel is one TENTH of a Bel; Shouldn't we DIVIDE (Log in base 10, etc...) by ten? Rather than multiplying it?

[@thormusique]

Thank you for this detailed - and practical - explanation! I've been using decibels in the professional audio world for decades now, but there have been certain applications that always escaped my grasp. Now I understand why, cheers!

[@mdesm2005]

isn't deci 1/10? a deci liter is 1/10 of a liter. Why is a deci-Bel 10 times a Bel instead of 1/10 a Bel?

[@nedcramdon1306]

dB or not dB .....that is the q...........

[@Youtube_deleted_my_favourites]

I follow this. But as soon as I go away me be like deciwhat all over again

[@TheSidlu]

Strange. deci-meter is meter divided by 10, but deci-bel is bel multiplied by 10...

[@rs7349]

Maybe not that important but the name Bell is with two l's (Alexander Graham Bell) so its a bit odd that the decibel is correctly written as decibel.

[@Stm072929]

Tears of joy.! Thankyou kind sir. I wish i had my signal & system teacher like you during my uni time.

[@lnfinity0]

Thank you for demystifying the -3dB that have been haunted me for quite some time.

[@isacdaimary9908]

This is Gold,,,Where have you been so long,, God bless who ever you are <3

[@boonedockjourneyman7979]

I’ve been tossing these terms around for decades. Now I actually understand what I once only knew.

[@gabriel-9962]

Thank you so much for this detailed explanation!

[@andrewharris6347]

I wish I had you as my teacher at high school … thank you for your explanation … it’s fantastic

[@agstechnicalsupport]

Great video for any experimentalists and designers in electronics, optics, acoustics or else. Instructor clarifies the confusion around the terms dB, dBm, dBV....etc. you encounter on datasheets and elsewhere in your career. He has put this valuable summary clearly and understandably together that most textbooks only throw out here and there to confuse readers. Thank you for posting such useful videos !

[@1973jdmc]

You are now officially a SUPERHERO- MR FANTASTIC- Thank you so much for an amazingly straight forward way of explaining dB-

[@justin4what834]

You are a legend. I am currently studying EE and I just got started with electronic filters, so it is really helpful.

[@HarvardBob]

This excellent video cleared up a lot if confusion with terms I used but was unclear about. Put much more succinctly than most courses ever do.

[@DucatiMTS1200]

Thank you for explaining all in a very clear and understandable way sir.

[@CubicIronPyrite]

THANK YOU!! I've never seen these concepts explained so well!

[@qzorn4440]

one of the most practical 3dB instruction videos...👍👍 thanks a lot...😉 a good one to watch again.