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Constant Q Graphic Equalizers
Crate Pro Audio's Live Sound Graphic Equalizers feature constant Q circuits which, unlike inferior broad band EQs, let
you boost or cut only the frequencies you choose. Combined with a switchable equalization range, these EQs allow greater
system control and accuracy whether using them for house coloration, feedback control, or speaker correction.
In order to achieve the highest level of performance from your equalizer, please read this owners guide prior to its use.
User's Guide
for the
"Thank You" from
LS1-131
LS2-215
LS3-231
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Table of Contents
Related Manuals for Crate Live Sound LS1-131
Summary of Contents for Crate Live Sound LS1-131
- Page 1 In order to achieve the highest level of performance from your equalizer, please read this owners guide prior to its use. User’s Guide for the “Thank You” from LS1-131 LS2-215 LS3-231...
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Page 2: Table Of Contents
Table of Contents: An Introduction to Equalizers...3 The LS1-131/LS3-231 Front and Rear Panels ...6 The LS2-215 Front and Rear Panels ...7 Using an Equalizer...8 Applications:... -
Page 3: An Introduction To Equalizers
The Crate Pro Audio Live Sound Graphic Equalizers are available in two mounting configurations: a 1-3/4” single rack space (LS1-131/LS2-215) and a 3-1/2” double rack space (LS3-231). These equalizers are a perfect addition to any professional sound system, particularly the Crate Pro Audio systems. - Page 4 As your ear passes across the stereo plane of your system, the comb filter effect sounds like “peaks” and “nulls” in the response which can change the imaging dramatically. Figure 3: Phase Response: -120 -150 -180 LS1-131/LS2-215/LS3-231 INPUT SIGNAL STOP FREQUENCY (Hz) Constant Q Graphic Equalizers 1kHz TONE BURST...
- Page 5 LS1-131/LS2-215/LS3-231 The LS1-131/LS3-231 both feature variable Low Cut and High Cut controls. The low cut control is not only useful for subsonic filtering, but provides a wider range of control for low frequency “ringing” in some sub-woofer systems and controls “wind” noises in microphones. This filter is extremely useful in using amplifi- er power more efficiently.
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Page 6: The Ls1-131/Ls3-231 Front And Rear Panels
The LS1-131/LS3-231 Front and Rear Panels: NOTE: The LS1-131 is shown; the LS3-231 is identical, except it has two channels, one over the other, in a 2 rack-space enclosure. 1 - POWER: Use this switch to turn the unit on and off. -
Page 7: The Ls2-215 Front And Rear Panels
LS1-131/LS2-215/LS3-231 The LS2-215 Front and Rear Panels: 1 - POWER: Use this switch to turn the unit on and off. 2 - EQ SLIDERS: Use these slide controls to make adjustments at the standard ISO 2/3-octave frequencies indicated above each slider. Each slider adjusts the signal ±6dB or ±12dB depending on the setting of the RANGE switch (#3). Moving a slider up boosts the signal;... -
Page 8: Using An Equalizer
When equalizing indi- vidual instruments in a mix, this range becomes very important to bring them to the “front” of the mix, cutting through the rest of the instruments. LS1-131/LS2-215/LS3-231 FLUTE OBOE... -
Page 9: Applications
LS1-131/LS2-215/LS3-231 Upper-Mid Range: (4kHz-8kHz) This region is the “presence” range which can determine whether the mix or instrument is “harsh” and “piercing” or “distant” and “muffled”. This range will also help voices and other instruments cut through a mix when boosted. -
Page 10: Room Equalization
After achieving an electronically flat response from your speakers in the room, use the Fletcher-Munson chart to adjust the contour according to the sound pressure level of the performance. These curves are intended to be used as guidelines only. Experimentation is always necessary to find your own “preferred” sound. LS1-131/LS2-215/LS3-231 EQUALIZER BALANCED OUTPUT... -
Page 11: Feedback Control
If this is not possible, then an equalizer with narrow bandwidth filters, such as the LS1-131 or LS3-231, is an effective alternative. To find the frequency at which the feedback is occurring, simply select the frequency you feel is the problem and move it to maximum “cut”. -
Page 12: Technical Specifications
LS3-231: 2x31 Constant Q Multiple-feedback 1/3 octave ISO spacing from 25Hz to 16kHz Center Frequencies, Hz (±3%) LS1-131/LS2-231: 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1k, 1.25k, 1.6k, 2k, 2.5k, 3.15k, 4k, 5k, 6.3k, 8k, 10k, 12.5k, 16k, 20k LS2-215: 25, 40, 63, 100, 160, 250, 400, 630, 1k, 1.6k, 2.5k, 4k, 6.3k, 10k, 16k...