Hi Eril
I hail from Singapore and we use the same 230v as New Zealand. Being a passive, preamp, the TAP only needs power to manage the controls (volume, source, balance, etc). I believe you can buy an adaptor from your local electrical shop which gives 10 v DC (there is a range of voltages that run fine with the TAP, I don't have the info offhand but I am sure John will chip in). Works fine, no problems.
Best Regards
Dennis