iPhones 6s Speaker Rattle on Verizon with Automated Recordings

[cellulartalk]

Seems like I get an over amplification or speaker rattle when I call certain automated attendants. Other calls it is not there. I am not sure if it is too much Bass or Treble. Normal Call seem to be fine. Is speaker rattle on high or low pitch a known issue for the iPhone 6s Plus.

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Courtesy of WestNet Wireless
www.westnet.ca