The wattage requirement for a soundbar to be loud enough for an entire house party can vary depending on various factors, including the size of the room, the desired volume level, the efficiency of the speakers, and the acoustics of the space. However, a general guideline is that a soundbar with a power output between 100 to 300 watts should be sufficient for most house parties.
It's important to note that wattage alone does not determine the loudness or sound quality of a soundbar. Other factors like speaker design, driver size, and audio processing capabilities also play a significant role. Additionally, if you're hosting a large party or have a particularly large space, you may need to consider using additional speakers or a dedicated audio system for optimal coverage and volume.