The spelling of the word "ACTSEA" can be a bit confusing at first glance. However, it can be broken down using IPA phonetic transcription. The first syllable "ACT" is pronounced as /ækt/ (short a sound followed by the k and t sounds). The second syllable "SEA" is pronounced as /si/ (the s sound followed by the long e sound). Therefore, the correct pronunciation of "ACTSEA" would be /ækt.si/. It is important to pay attention to the phonetic transcription in order to accurately pronounce unfamiliar words.