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Microphones & Speaker Systems
Take the time to study the potential audience area to be covered with careful attention to the horizontal and vertical angles the speakers will have to cover. The height of the speakers above the audience is critical to effective sound coverage and optimum quality. For maximum sound quality and minimum room interference, Passport�s speakers have been specially designed to work with tripod and speaker support systems. Using the optional Passport Tripod kit, set the speakers at the maximum safe height that will allow listeners at the rear of the audience area to get a clear �view� of the speaker systems. Nothing absorbs sound better that a few hundred people between you and the speaker system. Always set up speaker support and tripod systems in strict accordance with the owner�s manuals and safety requirements of those devices. It is very important that the speakers are aimed and positioned as far away from and in front of the microphones as cables allow. A microphone is designed to pick-up any and all sounds. Your Passport P-51 microphones have a cardioid pick-up pattern and are designed to reject as much sound coming from the sides and rear of the microphone as possible. If the loudest sound the microphone picksup is the sound from the speaker systems, destructive feedback-howling will result. Position the speakers and the microphones so the minimum amount of amplified sound gets back to the microphone(s), and the maximum amount of the sound you wish to reinforce is input. In this way greater volume before feedback can be realized and disruptive howling-feedback reduced or avoided. For music and other types of entertainment, place the speaker systems symmetrically either side of the stage, in relation to the audience. For effective �stereo� reproduction, all of the audience must hear both speakers. For mono or speech only applications, consider placing the speakers as close together as possible and angled for coverage of the audience area. In this way greater output levels can be reached and a more natural single point source is created for the sound. Again, placement of the speakers is a critical element in the successful use of your sound system. Take time to carefully consider the variables and by all means experiment. There is no absolute right and wrong in sound, just what works best for you in your application.
MONO MIC / LINE CONTROLS
� This control features a detented or notched position indicator Channels 1 - 4 Level: The Level control adjusts the amount of incoming signal sent to the rest of the mixing stages. Correct adjustment of this control is critical for clean, and undistorted operation of the Passport System. Follow set-up instructions on page 6. VIP (channel 1 only): The VIP or Vocal Input Priority control adjusts the threshold at which the level of all other channels are automatically reduced in favor of the microphone attached to the Mic 1 input. This unique feature permits a user to speak while other inputs (such as background music) continue at temporarily reduced levels. Adjust this control while speaking into a microphone on channel 1, with other program material input through another channel. Depending on the duration and level of the signal being input to Mic 1 and the position of the threshold control, the VIP circuit will trigger a reduction in level of all the other channels. The original levels will be automatically restored when there is no signal present on channel 1. The duration of the reduction in level will depend on how strong a signal is input to the VIP circuit. Adjust for the amount of this effect desired for your application. In typical use the circuit will return normal levels in about 4 seconds. With the threshold higher or a stronger signal normal levels will be restored after approximately 6 seconds. The VIP circuit has an intentionally slow release time. The slow release prevents interruptions through the momentary restoration of music when a talker pauses for thought. With a hand held microphone and normal speech the VIP will operate properly set to approximately the two o�clock position, if the user is further from the microphone, a higher setting will be needed. Care should be taken to avoid the VIP triggering on sound from the main speakers. At high threshold settings the microphone may �hear� the main system speakers and trigger a reduction in level. Note: The VIP Threshold is sensed PreFader. When not in use, turn this control to the Off position. See the section referring to speaker placement and mounting and avoid setting the VIP threshold unnecessarily high. 9
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