A design of engineering of speaker enclosures, the performance, sound output, bass, and sub frequencies are not guaranteed. Band pass, Sealed and Vented Designer calculate speaker parameters based on loudspeaker theory and engineering equations/principles/formulas. The calculations are used to predict loudspeaker parameters. This was noted, because not every loud speaker design will give the expected results and different design of box's give you a more bass or can give you a less bass, it can very on the design,
All prices are in USD.