Bryce's Speaker Building: Information about building speakers for DIY projects.eBuying Guides: Where to Buy Speakers/Headphones: Concentrates on where to shop for products, but also has staff-produced buying guides. Some of the guides are links to other buying guide sites.Epinions: Computer Speakers: Comparisons and reviews written by consumers.Epinions: Speakers: Consumer-generated reviews, buying tips and advice, ratings, price information, and searchable in a variety of ways from price to product type.High Efficiency (Exponential) Loudspeaker Set For Disco Application: Physics principles, calculations, drawings, specifications, pictures, and internet resources/references. PDF version of the site available as well.ReviewCentre.com: Speaker Reviews: Consumer reviews on speakers.Subwoofers - What You Need To Know: Explains types, crossovers, alternatives, shopping and installation tips.