The Trym is a 2 way bass reflex in 34 L box. Frequency response is 28Hz to 25KHz. Sensitivity: 87db 1W/1M The tweeter is the Seas Excel T25-002 Millennium. The woofer is the Seas Excel W22EX001. The low pass network is an augmented 2nd order Butterworth design. An additional network is placed in parallel with the woofer to remove the high frequency peak of the woofer's magnesium cone. The high pass network employs a conventional 3rd order Butterworth filter with an additional impedance compensation network. The X-over frequency is 2.4KHz A great deal of experimentation was done on this design before the final X-over network was chosen. The sound of this system is smooth and involving.