“I have my turntable connected via Bluetooth to a sound bar system with a subwoofer. It connects fine but when I turn the volume up above half way I start getting a terrible humming feedback. How can I fix this? No receiver is being used to ground to.”
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The turntable is just mechanically picking up the sound in the room and then re-amplifying it. You need to better acoustically isolate the turntable from the room. If the turntable is near one of the speakers, move it. If the turntable is on a flimsy shelf, put it on something solid.
Sorry, there was a problem. Please try again later.This sounds like a classic case of feedback between the turntable and the nearest speaker. Perform this test. Turn the speakers off and listen to the record through headphones instead. If you do not hear the humming in the headphones, it is feedback between the speaker(s) and the turntable. Feedback can be caused by the air between the speaker and turntable being disturbed by the movement of the drivers in the speaker, or by vibration coming of the speaker enclosure reaching the turntable (particularly if both are sitting on the same surface). You may need to create more distance between the nearest speaker (particularly if that speaker happens to be the subwoofer) and the turntable, or you may need to isolate the turntable by placing it on a different surface. The phono pickup (cartridge/needle) on a turntable is basically a miniature microphone and the same type of problem that occurs when a microphone is used too close to a speaker, or the speaker is turned up so loud that the sound that had entered the microphone originally now reenters the microphone, can occur with the cartridge/needle.
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