I have 4 herdio speakers on the way that come with a Bluetooth amplifier two left outputs two right outputs
The room is an outdoor veranda with dimensions 36ft X 12ft and I’m planning on placing the 4 speakers in the corners of the veranda but not sure if I should place both lefts side by side and a rights side by side on the short sides or the long ends or in opposite corners! Perfect listening position etc isn’t important I just want the sound to be consistent both ends of the deck without having to have it high volume to be nice to the neighbours when it gets late!
I’d determine what direction most people will sit and face, probably with the door at their back and put left on the left front and back and right on the right front and back.
If you put two lefts at the front and two rights at the front it won’t be as loud 36 feet away vs. 6 feet away.
That amp is not going to be anywhere near 400 watts in total or per speaker.