[x-post /r/Oppo] Potential widespread speaker defect in Oppo Find X10 Pro Max

[u/44seconds]

TL;DR: Every Oppo Find X10 Pro Max I have tested (7 units) has significant speaker resonance at around 800 Hz, causing it to buzz at certain speech frequencies (for example in Zoom)

Long version:

Recently purchased 2 white 16GB + 1TB X10 Pro Max, and those along with 3 new replacement units officially provided by Oppo had the same defect.

A strong resonance (physical buzzing) at around 800 Hz for both the top & bottom speakers. Sadly it is very obvious for certain voices when using Zoom.

Try https://www.szynalski.com/tone-generator/

Change the generator volume to max && set the phone volume to max. Sweep the frequency to around 800 Hz and you will hear the buzzing. Also present in 2 display units I tried.

So every unit I've tried (2 units purchased from official Oppo dealers, 3 official brand new replacement units, 2 display units) showed buzzing speakers.

[u/DDz1818]

Sounds like they used cheap garbage parts.