115 VAC is OK. I would only start to worry if the line voltage starts dipping below 110 VAC for _extended_ periods of time. It is normal for the voltage to drop momentarily when something like an air conditioner comes on, but it should only last a second or so. My voltage goes all the way down to about 90 volts when my air conditioner kicks in. By the way, low power voltage will _not_ cause the hiss to be louder or softer.

It sounds like Scott and the Outlaws are sort of 'throwing in the towel' judging from his reply to you regarding the hiss. I remember that first they were saying 'ear to the tweeter' was unreasonable, now it's 4 feet. Maybe it'll get out to 10 feet..... Anyway, if the hiss bothers you THEN IT IS TOO LOUD!!