User manual PRECISION POWER PC740.5

[. . . ] · Differential RCA Inputs Isolate 12V/Audio to Ground, Eliminating Ground Loops and Noise. · Full Signal Path Low Noise/Distortion Circuitry Topology. · Optimal Component Layout for Minimal Distortion Induction & Signal Separation. [. . . ] Speaker Terminal Block This is the Speaker(s) Connection. All components, coaxials and subwoofers connect here. Crossovers These controls allow you to pass and block frequencies to each driver. This is one of the most important parts of tuning any audio system. LOW PASS ­ This control allows you to pass only frequencies lower than the frequency you choose to the drivers. For example, if you are powering a sub woofer and you choose 70Hz, then only 70Hz and lower tones will be passed through to the subs while all unwanted higher frequencies above 70Hz will be blocked. HIGH PASS - This control allows you to pass only frequencies higher than the frequency you choose to the drivers. High Pass crossover filters below 50Hz are also considered "subsonic" filters. Multiplier Switches ­ Sometimes you may need a range that is not within the range supplied by the control potentiometer. In this case, if the amplifier has a multiplier switch, the range can change to accommodate your needs. For example, let's say you have a 4 channel amplifier and you want to put the tweeters (1") on the front channels and the midbass (6. 5") on the rear channels, and use all electronic crossovers. You can set the High Pass for the tweeters at 4kHz. The low pass, if it as two ranges, may be from 50-800Hz which is not high enough. By using the multiplier switch, that same control can change the range from 50Hz-800Hz to 250Hz-4kHz. If this doesn't make sense and you do not understand frequencies clearly, PLEASE TAKE YOUR AMP TO A PROFESSIONAL PRECISION POWER DEALER!Bass EQ ­ This circuit allows you to choose a frequency between 30Hz and 90Hz and boost that frequency by 0-12dB. <10> Crossovers(continued. . ) Xover Mode Switch ­ Select HP/FR for High Pass / Full Range and only the HIGH PASS functions will work. [. . . ] Understand that this bypasses EVERYTHING so that the front channels are identical to the rear channels. Phase Switch ­ This switch changes the phase of the woofer from 0 to 180 degrees. Subsonic ­ The Subsonic Filter protects your subwoofers from playing frequencies below the physical limitations of the woofer, or that are beyond the human hearing capabilities. [. . . ]