Speizer said he expected the dollar to be "frothy" this morning as analysts weighed out Powell's comments and considered the likelihood of further cuts.
The markets have priced in two and a half cuts - a drop to around 1.5 per cent from its current 2.25 per cent.
"The market is sticking with around two and a half cut. Our economic forecast is for another one."
Speizer said that may be revised based on how strong economic data is in the coming months.
The fall in the Kiwi will lessen the pressure on New Zealand's Reserve Bank to also cut its official cash rate although Speizer said it would also be considering similar issues to the US - low inflation and global risks including slowing growth.