Marine Engine Bay Noise Reduction - Suitable Insulation Products for Marine Engine Bay Noise Reduction An unshielded diesel inboard engine can reach upto 110dB. This is on par with several types of construction equipment. The government usually advise against prolonged exposure to in excess of 95dB. If your marine vessel is noisy, there is no need to replace the engine. Aftermarket boat sound insulation products are becomming more apparent with their one-off fit requirement, whilst providing las