I have just bought a pair of Yamaha HS50m monitors, connected only the power cable, switched them both on, and they are both making a noticeable constant hissing noise?Is this normal? Should this happen?Is it because I have not yet connected them to my interface or any other device?I am worried I have purchased a dodgy pair and would be grateful for any info.many thanks
You might have a short somewhere.
Almost all powered studio monitors have some hiss if you have the input level turned all the way up - this is normal.