put the rear up on jacks with the handbrake off and spin one of the rears with your hands and listen for the noise. I had a similar sound that i only heard at low speeds but the sound was also pulsating. later figured out it was the rear pads were coming in contact with the rotors (pulsating because of wear). The rear calipers are adjusted with the allen key and they were a bit too tight im guessing and by loosening it up they stopped making contact and the sound went away.
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