I had a look at the web site.
Note that while it isn't mentioned on the pages we see, it is a PAID course. It isn't free.
You will see buried somewhere at the end, that if you opt out etc. they will not refund anything. That would mean you would have paid on registration !
There is enough FREE information and tutorials and video's on the Net where you can learn all these things. Use Google freely and you will find everything !
Loudspeaker experts from the industry have explanatory video's on Youtube.
The Net is often a FREE goldmine !
USE IT !! ...........FREE Gold ...anyone ?......