Barrier sheets, composite insulation, sound absorption, and other materials for deadening sound on boats.
Placed between the engine and its supports, these adjustable mounts reduce structure-borne noise. Available for other equipment as well.
A nontoxic water-based vibration absorbing material. You apply it just like paint and it dries to a hard surface which absorbs noise and vibration and converts it into low-grade heat.
Blog on the subject of soundproofing, mostly about apartments but has lots of do-it-yourself tips and product information for those who are thinking of soundproofing their boat.
Brief grab bag of facts and commentary on diesel versus gasoline engines, prices of diesel engines, lubrication, cooling, exhaust, and noise. Contains excerpts from hard-to-find bulletin board and newsgroup postings, as well as links to useful sites and vendor pages.