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I’m frustrated

alto uber lt - hiss and hum from grounding, is it a defective unit, or an engineering problem

alto uber lt
serial # (21) 41812118800123
purchased by mark tang

i've contacted the vendor to request a refund on this item.
unless the seller can provide a replacement of this item that is properly grounded and does not create noise in the audio signal, i cannot use this item because it is poorly made.
there is a loud audible constant hissing noise in the audio through both the speaker and the line out, and it increases with the volume. the output is unrecordeable and the audio engineer can't remove the hiss. i have tried this on all the inputs using various instruments both xlr in, line in and aux in, all with the same hissing noise result.

i had hoped to find a unit of this size to perform with. so i'm asking Alto - is this a defect in your product engineering, or is this just a defective unit?

ALTO Pro Uber LT 50-Watt Portable Rechargeable Bluetooth PA System
( 254186111030 )
1 person has
this problem
  • Hello, TangMan

    Thanks for posting!

    Sorry to hear you are getting a loud hissing sound from your speaker. If this is the case for all audio sources, the speaker may need to be sent in for repair.

    Warranty and non-warranty claims are not handled here on the forum, but I can point you in the right direction! Here are a couple of options that you could choose from:

    • Submit a Warranty or Service inquiry with our Technical Support team by logging onto the Alto Pro Audio Support Page. Select Warranty or Service Inquiry from the drop down menu.


    • For quicker support, call your nearest Support Office or International Distributor.

    Make sure to reference or link this thread to help out the support team.

    I hope this helps! Let me know if you have any additional questions.
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