The VO-B1 bullet super tweeter covers the frequency range from our high output midrange speakers to frequencies that send dogs running for cover. The motor uses CnC machined parts for close tolerance, high magnetic strength motor design. The diaphragm is a highly rigid, pressed titanium alloy connected to a high-temperature voice coil. The VO-B1 comes with an in-line 12dB/oct crossover attached to the direct connect lead wires. Plug and play high output has never been so good and so easy.