Crate Live Sound LS4 User Manual
Crate Live Sound LS4 User Manual

Crate Live Sound LS4 User Manual

24db/octave active stereo crossover

Advertisement

Quick Links

User's Guide
for the
LS4
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

Advertisement

Table of Contents
loading

Summary of Contents for Crate Live Sound LS4

  • Page 1 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...
  • Page 2: Table Of Contents

    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.
  • Page 3: The Front Panel

    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.
  • Page 4: The Rear Panel

    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.
  • Page 5: The Low Cut And High Cut Switches

    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.
  • Page 6: The Cd Horn Eq Switch

    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 .
  • Page 7 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.
  • Page 8 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.
  • Page 9: For Bi-Amping In A Single Enclosure

    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 .
  • Page 10 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.
  • Page 11: For Tri-Amping

    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.
  • Page 12: Technical Specifications

    24dB/Octave Active Stereo Crossover Technical Specifications Filter Type Two 24dB/octave Linkwitz-Riley state variable filters Control Range 50 - 1kHz (X1) 500 - 10kHz (X10) 3-Way Mono Mode Operation Internally Wired Input Impedance10k ohms Input Connections Balanced XLR & 1/4” T/R/S Output Impedance 2.2k ohms Output Connections...

Table of Contents