They are very loud. Much louder than a rooster and their voice does carry like someone said.
The good thing is, the males do the shrieking/yelling during the breeding season.. about May-Aug then rest of the year they are generally quiet, save for the occasional honk from the hens.
Java greens and emerald spaldings are not as noisy or as shrill(but not totally quiet either!) as Indians but pure greens cannot stand cold winters, many spaldings are able to though.
They also need a much bigger pen due to their being big birds plus of course the peacock's tail. They spread 10 feet wide when displaying so you need to make the pen at least that wide or the tail will get ruined from rubbing against the wire. For a pair often 10 x 30 or 20X 20 minimum is recommended.. but if you can make it bigger or longer so much the better.
If noise is a major concern, look into pheasants. Goldens are incredibly colorful and need much less room.. The cocks do make a crowing that sounds like a squeaky wheel, most of the time neighbors never realize it;s coming from your yard, they just think it's some kinda wild bird.... I used to know a lot of people in Los Angeles who had them despite being right in the city or in suburban lots for that reason.
Other pheasant species can be easy but some tend to have species-related quirks which makes them somewhat problematic to keep so do research before buying.. goldens are the easiest and most problem free of them all though.
