How much weight can an upstair room can hold?

Back in my more "recreative" days, I was renting the upstairs apartment of an old farmhouse and fell asleep in the living room while I was filling my waterbed. When I awoke (about 3 AM) the height of the top center of the bladder was above my waist line (and I'm 6-3). Given the weight was probably over a ton, I was very lucky it didn't crash down onto my landlords dining room table and kill someone. I told him about it a few years after I had moved out. He thought it was hysterical. He died some years later in jail from alcohol withdrawl serving DUI time. I have absolutely no idea where this was going but at least BE ALERT. Yeah, I know, the world needs more lerts. FWIW

YOu can ask your local building official what your state building code is based on for a residential structure second floor. Also you can figure that a 200 lb amp = one fat-a$$ed American and draw your own conclusions. And remember that most building codes would be based on a load in terms of weight per square foot so a 200 lb amp is probably providing a similar load to a 200 lb person standing up.

You should have no problem. The heaviest item per square inch in your home is your refrigerator when full. It's even heavier than a waterbed per sq inch. There are lots of homes with frig's on the second floor. I have my record collection and stereo on the second floor of my house. My house is over a hundred years old. I did add support under the records but not the rest of the room. 400 lbs is about 2-3 people at most BTW.