Yes, the sub is what I was referring to. Altho AUD 2100 isn't as far off from the Rythmik price here in the US (altho includes shipping to the continental US in the US price), roughly USD 1800 each...but then I think Rythmik is a bit overpriced for this 12" sealed sub....
I've built several subs, a keyboard I wouldn't have any idea.
I wanted some woodworking tools when I moved into my current place and finally had space for a decent workshop, plus I wanted several larger subs than what I had. Little experience with woodworking at the time, but boxes aren't that hard I figured (and they were a bit harder than I thought). Finishing can be harder, especially to satisfy any WAF.
Good luck on your system.