Hiss from Alto Black 12. Is it normal?

There's a very noticeable hiss coming from my Alto Black 12 speakers. Is this normal? It doesn't matter if there's nothing connected to the inputs, doesn't matter if I turn the level knobs all the way down, as long as the speaker is on, there's hiss coming from the HF drivers. Happens exactly the same on both speakers.
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  • Hello,

    Thanks for posting. I'll be happy to help!

    Make sure your Black 12 is properly grounded. We recommend connecting your speaker(s) to a power strip/surge protector and don't recommend overloading it, as this can cause extra noise to enter your signal. 

    Can you give me some more, detailed information about your setup? Are you using additional amplifiers or mixers? Do you hear hiss when audio passes through the Black 12?
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  • I'm using onle the black 12 connected to a Furman power block that has EMI/RFI/Surge protection. If I connect ONLY the speaker and turn it on, you can hear the hiss coming from the high frequency driver. It will sound the same no matter what I connect to it. I've tried it with a mic connected directly to the speaker with an XLR cable, 1/4" cable out of a mixer, XLR cable out of a mixer and with my phone. It makes the same sound in all cases, and when there's nothing connected it's the same as well. I've heard this sound before from many other sound systems when you turn the volume way up and don't play anything through them. It's like an "airy" sound. Happens exactly the same on both speakers, so I'm thinking it might be normal for these speakers, but thought I should ask anyway. Are these speakers supposed to be dead silent when I turn them on with nothing connected to them, or is that "air-like" hiss to be expected?
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  • Okay, thank you for clarifying. I understand now. Yes, since these are active speakers, it is normal to hear a little bit of hiss from the tweeter. This is simply the electrical circuit you're hearing. However, you should not hear this at all when audio passes through the speakers. Hope this helps!
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    I see. Thank you for your reply! I do notice more of it when I turn up the fader on the mixer past 0dBu. These are supposed to be used at +4 dBu, according to the manual, so I find it kind of odd. I'll see if I can try a different mixer with better results. My question has been answered, though. Thank you and have a great day!
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  • This reply was created from a merged topic originally titled Alto Black 12 / Alto Black 15 Speakers Making Buzzing Noise.

    I have 1 pair each of the Alto black 12 & Alto Black 15 speaker setup. I bought them for a project that never materialized, so I used a 12 and a 15 in my basement. I connected these speakers (and all of my gear) to a Furman voltage regulator. On separate occasions, when I powered on the speakers one of each 12" & 15" speakers now makes a buzzing noise. It's coming from the HF tweeter and speaker. What could be the problem here?? I have babied these speakers from the start and only had them for about 2 years.
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    • My issue is totally different than the one in this discussion. Both my speakers are making a BUZZING NOISE, NOT A HISSING SOUND as it once did when it was working properly. I plugged the speaker directly into the wall outlet and it still makes the same BUZZING NOISE, regardless if it is connected to a mixer or not. My speakers makes this BUZZING NOISE if the volume is completely turned down or up.
    • Right, but if your speakers are buzzing, this can be indicative of improper grounding, as mentioned above. We recommend connecting your speaker(s) to a power strip/surge protector and don't recommend overloading it, as this can cause extra noise to enter your signal. Check out this link here for more information. If you're still having issues, please get in touch with your nearest Support Office by logging on to www.altoproaudio.com/support. Their contact information will be listed on that page. 
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