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Old 27-02-12, 09:47 AM
Thor Thor is offline
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Join Date: Jul 2008
Location: Meriden near Coventry
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To my mind 'sewing machine' noise is high frequency noise. This is usually air-born noise, rather than due to structural vibrations, it is less likely to be stopped by dynamat and the like than by sound absorbing materials (as opposed to vibration dampening materials).
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