What is octave doubling?

[wavewar3]

No real description needed. Just didn't get the explanation given in my music theory book.

 

[Wapiti]

If I play the A3 note, playing the A4 note at the same time will have doubled my octave.

 

[bandcoach]

the same line played an octave apart at the same time whether by the same sound or different sounds is octave doubling

see these for concrete examples

https://www.futureproducers.com/for...astering/synths-layering-495146/post49882133/

https://www.futureproducers.com/for...ten-my-orchrestral-stuff-351377/post49000509/

https://www.futureproducers.com/for...k-approach-chordal-approach-bandcoach-406701/