To increase max volume on MacBook Pro?

...running El Capitan...

Boom

or

Sound Blaster

or

????

Which one is better?
And is there a third app that will do that?

I assume both the above are compatible with El Capitan

Just wanted to know if anyone had tried both and finds one better than the other

via ehMac.ca http://ift.tt/2lYrpqw