thanks for your answer, but my English is very bad so I want be sure to understand. When you say 8 cu ft is optimum for 515B I understand I have to add under my LaScalas a box of about 5.75 cu ft. Is it right? Besides, can you explain what means "two pole high-pass filter with a Q=1.3~2.0 at Fs."? I'm using now a 12 db filter between preamp and bass amp: the first stage cuts about 450 hz, the second about 800. Regards
