Loudspeaker design, another example of how the myths of the internet have overtaken this hobby and created some exaggerated claims.
A practical step by step design and construction manual with free software on building a ducted phase inverter or bass reflex speaker.

What is High Fidelity? It is the ability to re-create the sound that the recording engineer spent half the night trying to perfect and is not a 5 in 1 surround sound movie theater system with the bass cranked to maximum. I firmly believe that the art of loudspeaker design has passed from the engineer to the accountant, who is intent on the bottom line only - the dollar. It is a mass market where quantity rules not quality. So, if you are one of those people seeking the ultimate sound and who would be proud to say, “I built ‘em”, read on. If on the other hand you want to learn about loudspeakers or just want to tweak your existing set, then this is an excellent reference to have. Includes crossover building, coil winding, speaker testing and much more. Plus free software.