Mine is from Rich Tone Music, built in January this year so as new as can be. Again, must stress the hiss is unaffected by any EQ settings or volume, remains constant. Of course, on increase VPF settings the main speaker hisses more at high volume, but the tweeter remains exactly the same. Will be completely drowned out at gig and practice volume, in fact anywhere after 9oclock on the Master, but it is louder than the fan and noticeable below this. Not ideal for home practice or studio use. However, from what I have read it looks like it is par for the course with tweeters that do not have attenuators, but have contacted the shop anyway to see if they have experienced issues with tweeters before.