Isobaric speaker box calculator3/9/2024 ![]() ![]() Therefore, the efficiency also decreases by half, SPL decreases by 3 dB. The Vas is halved, since per chassis only "one side" of the diaphragm contributes to the acoustic power respectively the diaphragm mass is at least doubled. the TSP of the new compound chassis are also practically identical with the exception of the Vas, Re, Le and the efficiency. If the coupling volume is practically 0 ltr. ![]() The acoustic (airtight) coupling and electrical interconnection of two (usually identical) chassis creates a new chassis with new TSP. ![]() is completely identical, only the (modified) TSP of the compound chassis has to be used. The calculation of cabinet sizes, tuning tunnels etc. This is not mine, I found it somewhere, but it could explain what you were seeing with regards to isobaric:īy electrically and acoustically coupling two woofers (coupled-chamber or compound principle), the required cabinet volume can be reduced by about half of what would be required if only one chassis were used.Ĭompound systems, however, are basically no different in construction than single-chassis systems. ![]()
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