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User’s Guide for the 24dB/Octave Active Stereo Crossover In order to achieve the highest level of performance from your crossover, please read this owners guide prior to its use. “Thank You” from...
Introduction: Crate’s new LS4 is a rugged multi-purpose active crossover housed in a standard 19” single space rack enclosure. It features pushbutton selectable two-way stereo or three-way mono operation. All inputs and outputs are balanced for low noise operation.
24dB/Octave Active Stereo Crossover The Front Panel: 1,12 - INPUT: This control adjusts the level of the input sig- between 50Hz and 1kHz. The effect of this switch is repre- nal to accommodate a wide variety of sources. The Input sented graphically on page 5.
24dB/Octave Active Stereo Crossover The Rear Panel: 22 - POWER JACK: Plug the small end of the AC Mono mode: #25 is not used. #29 sends the low fre- adapter into this jack. Plug the other end of adapter into quency signal to the low frequency amplifier.
24dB/Octave Active Stereo Crossover The Low Cut and High Cut Switches: The Low Cut switch (#3,#14) provides a 6dB/octave cut in the amplitude of signals below 40Hz to eliminate sub- sonic rumble. The High Cut switch (#4,#15) provides a 6dB/octave cut in the amplitude of signals above 15kHz to reduce hiss and other unwanted high frequency noise.
CHANNEL ONE LOW OUT woofer . Connect the LS4’s to the input jack of the amplifier which will be used to power CHANNEL ONE HIGH OUT the upper range speaker cabinet .
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24dB/Octave Active Stereo Crossover How to Use the Crossover (con’t): With a Subwoofer (con’t): Before turning the amplifiers on, you will need to set up the crossover. First, set the Input level to “10” (full clock- wise). Set the Frequency control to properly match the spatial relationship between the subwoofer and upper range cabinet.
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100dB 1W/1m, then the difference in acoustic output between the two speakers is 5dB. With your LS4, you can accurately adjust the High Out control down 5dB less than the Low Out control to compensate for this difference, provided the outputs from the power amps are the same.
CHANNEL ONE LOW OUT quency section of the enclosure . Connect the LS4’s to the input jack of the amplifier CHANNEL ONE HIGH OUT which will be used to power the upper frequency section of the enclosure .
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24dB/Octave Active Stereo Crossover How to Use the Crossover (con’t): For Bi-Amping in a Single Enclosure (con’t): The dispersion characteristics of a typical speaker and horn are illustrated below: This chart illustrates different diameter cone loudspeakers and their typical dispersion characteristics: As previously stated, system balance is very important.
The LS4 features a 3-way mono mode that can be activated by pressing in the Stereo/Mono switch (#11). This switch internally connects the two channels together providing a Low, Mid and High output. In the Mono mode the controls function according to the labeling directly beneath them (in light gray boxes), and the rear panel outputs carry the signals indicated by the labeling directly beneath the jacks.