The extreme performance of the THE BLACK SWAN ACTIVE EXT RC with two 15" woofer units sets with its maximum sound pressure level of 140 dB (Mid / Low) new standards. Each BLACK SWAN channel is capable of incredible SPL levels, but also the more impressive dynamic contrasts from whispering dialogues to explosive effects. The volume ranges your home theatre speakers needs to be able to handle without audible distortion is huge, especially if you look for a reference level director’s cut performance - this level difference from softest to loudest sounds is called ‘dynamic range’.