Woofer Bottom Mount Depth [in, mm]: 2-15-16, 75. Flush Mount Tweeter Hole Diameter [in,mm]: 2-3/8, 61. Flush Mount Tweeter Depth [in,mm]: 1-1/4, 32. High Pass [dB], at Frequency [Hz]: 12, 4,000. High Frequency Output Attenuation [dB]: 0, 4.5, 9 KS-Series 2-Way Component Systems are stunningly accurate upgrades with extraordinary mounting flexibility.