Page 40 FT DX 9000MP OPERATION MANUALFPS-9000H F RONT P ANEL C ONTROLSMain Power SwitchThis is the power supply’s main ON (I)/OFF (O) switch.If this Main Power Switch is not set to the “ON (I)”position, the FT DX 9000MP’s POWER switch willnot function.SpeakerTwo large-aperture (4”/100 mm) high-fidelity speak-ers are provided, one each on the left and right facesof the speaker enclosure.The left speaker puts out audio from the Main (VFO-A) receiver, while the right speaker puts out audio fromthe Sub (VFO-B) receiver, and the two speakers oper-ate independently.MUTE A and MUTE B SwitchesPressing the MUTE(A) switch will mute the audiofrom the Main (VFO-A) receiver; similarly, pressingthe MUTE(B) switch will mute the audio from theSub (VFO-B) receiver.The Mute capability is particularly useful during DualReceive operation, when you may wish to concentrateon one signal or the other temporarily without the dis-traction from the audio from the alternate receiver.OUTPUT SwitchIf you press the OUTPUT switch (when the [A+B]switch has already been pushed), the two speakersbecome combined, producing an effective doublingof the speaker aperture (to 8” or 200 mm). This yieldsa significant enhancement of overall tonal quality.Press the OUTPUT switch once more to restoreseparate operation of the speakers, whereby the leftspeaker puts out audio from the Main (VFO-A) re-ceiver, while the right speaker puts out audio from theSub (VFO-B) receiver.Front LegsThe left and right case legs, in the front, may be ex-tended so as to match the height of the (raised) FT DX9000MP. See page 5 for details.Headphone JacksThe “A/A+B” Headphone Jack supplies audio fromthe Main (VFO-A) receiver.The “B/A+B” Headphone Jack supplies audio fromthe Sub (VFO-B) receiver.If the OUTPUT switch has been pressed, both head-phone jacks will provide mixed audio from the tworeceivers.FILTER SwitchThe left FILTER(A) switch engages the audio filterfor the Main (VFO-A) receiver. The right FILTER(B)switch engages the audio filter for the Sub (VFO-B)receiver.The audio filters feature three high-cut (2.4 kHz, 1 kHz,and 700 Hz) and two low-cut (500 Hz and 300 Hz)settings each. To disable the audio filters, please set therespective switch to its “NORM” selection.NORM3005007001k2.4kNORMThe audio filter is disabled.Audio below 300 Hz is attenuated at a rate of -6 dB/octave.Audio below 500 Hz is attenuated at a rate of -6 dB/octave.Audio above 700 Hz is attenuated at a rate of -6 dB/octave.Audio above 1000 Hz is attenuated at a rate of -6 dB/octave.Audio above 2400 Hz is attenuated at a rate of -6 dB/octave.The audio filter is disabled.LOW CUTHIGH CUT