Bulkhead Cabins

[azdrydock]

Cabins 741 thru 744 appear to be bulkhead cabins as indicated by the double lines on the deck plans. Has anyone stayed in these cabins and if so what was your experience?

We have stayed  in bulkheads twice on other ships, fist ship it was one of the the quietest cabin we ever had, second ship there was a constant loud banging. On the second ship a crew member said the bulkhead was part of the ballast tank and .the noise was the ballast water splashing against the  bulkhead. 

This is our first PG cruise so any unique advise on PG cabin selection ia also appreciated.