Powered monitor issue - flutter

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dragon1952
dragon1952 Posts: 4,894
One of my Fostex powered monitors has developed a very low amplitude 'flutter/motor boat' sound. I've switched the power to a different surge protector. It isn't coming from the input because it still does it without it connected. Built-in amp issue obviously? Going to get worse? Should I start looking for new ones I wonder?
2 channel - Willsenton R8 tube integrated, Holo Audio Spring 3 KTE DAC, audio optimized NUC7i5, Windows 10 Pro/JRiver MC29/Fidelizer Plus 8.7 w/LPS and external SSD drive, PS Audio PerfectWave P3 regenerator, KEF R3 speakers, Rythmik F12SE subwoofer, Inakustik Reference USB cable, Gabriel Gold IC's, Morrow Audio SP5 speaker cables. Computer - Windows 10/JRiver, Schiit Magni 3+/Modi 3+, Fostex PMO.4n monitors, Sennheiser HD600 headphones

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