default embed size

Hi

i noticed that on all my blog posts the youtube content defaults to a size which is much smaller than i would like - is there any way of setting the default video embeds larger? here is an example of what i mean - http://www.blatantlyblunt.com/index.php/Grime/Video-chip-x-stormzy-hear-dis.html

I would like the embed to be double the width.