Spoke on the phone with this company and shipping the 18" is $173 USD or $319 USD for the 21". It's a shame because this shop is literally 5mins from my old house when I lived in Australia.
Yes thats true. 1000Wrms amps are quite common in NZ. 18" + subs are not. Probably best I coincide this with my next trip over to Australia. In the mean time I can make an enclosure like the examples already posted.
I don't like to send people to other forums but AVS has the best DIY section right now and a LOT of the Canadians that want the big subs go with the ones from IST. There are a lot of designs for those subs there.
It's a 12inch sub in a relatively large box. Now according to my physics the size of this box would deliver a nice low rumble bass that I'm looking for in movies without having to go for the DIY option. Although a review of it says the SPL is lacking, I'm quite tempted because rarely do I see Home theater subs in large enclosures like this.
Considering if I went for a new sub like this I'm looking at roughly 4 times the price point, I'd say a demo is in order.
I can't convert the currency so I have no idea what price you are looking at.
If you decide to go DIY, I'm almost certain that Alpine "car audio" subs are available in New Zealand. Certain models work very well in the home environment.
Hi Robert_J good to see you still active here and thanks for your advice. I must be honest and say I don't really have the time or patience for a DIY build right now with other unrelated projects and work etc taking up a lot of my time.
I've found that importing speakers from the states is very cost effective lately. At present I can import a new BIC f12 for 324usd shipped. On the flip side I can get an older B&W ASW-650 locally for 372usd listed below. Yes this may seem like a lot of money to Americans, but speakers are all dear over here. Just this morning I worked out that I could get Polk RTI A9's for 1025NZD shipped on Ebay when locally they are being sold for 3600NZD !! crazy and I dont think I'll ever buy new speakers locally at those prices.
Anyway here is the B&W sub I'm considering, It will be used in conjunction with my 10" mission m6as.
Correction I can see the BIC PL-200 on ebay and have contacted the seller to see if I can get international shipping. So lets throw that sub into the mix as well for now.
Ok the only BIC PL-200 I can see on ebay does not ship international.
However...
I have now expanded my budget to include the HSU VTF-2 MK4. I see their amps are 230v compatible and they informed me by email they can ship to New Zealand. So now I'm just waiting on a shipping quote.