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#include "bandpassbox.h"
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System(const Speaker &s, const SealedBox *b, unsigned int number = 1);
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System(const Speaker &s, const PortedBox *b, unsigned int number = 1);
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System(const Speaker &s, const BandPassBox *b, unsigned int number = 1);
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double response(double f);
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void render(QPainter *painter, const QRectF& area);
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int sibling; /* number of same drivers (not for push-pull!) */