LS1-131/LS2-215/LS3-231Constant Q Graphic Equalizers

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

2

3

4

5

6

7

8

9

10

11

12

13

14

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 1/3-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; moving it down cuts the signal. The center detent is the “flat” position (no boost or cut).

3 - RANGE: Use this switch to select one of two adjustment ranges for the EQ sliders (#2). With the switch out, the adjust- ment range is ±12dB. When this switch is depressed, the adjustment range is ±6dB. Care should be taken not to acciden- tally change the range from 6dB to 12dB during operation if extreme boosts are used, since the boosts will dramatically increase if this occurs.

4 - BYPASS: When depressed, this switch routes the input signal directly from the BALANCED INPUT jacks (#9) to the BALANCED OUTPUT jacks (#10), bypassing the equalizer controls completely. This is useful when comparing the equal- ized signal to the original. The adjacent LED (linked graphically to the switch with a solid line) glows red when in the bypass mode.

5 - PEAK LED: This indicator glows red when the input or output signal is within 5dB of clipping. Adjust the LEVEL con- trol (#8) so this LED only flashes during strong, peak-level signals.

6 - LOW CUT: Use this control to set the rolloff frequency for the high pass filter. The filter is continuously variable from 10Hz to 250Hz with a rolloff of 12dB/octave.

7 - HIGH CUT: Use this control to set the rolloff frequency for the low pass filter. The filter is continuously variable from 3kHz to 40kHz with a rolloff of 12dB/octave.

8 - LEVEL: Use this control to adjust the input signal level. For the best signal to noise ratio set this control so the PEAK LED (#5) flashes on strong, peak-level signals. The overall output signal level of the equalizer is determined by the setting of this control and the EQ sliders (#2).

9 - BALANCED INPUTS: The mixing board, amplifier or instrument (“source”) may be connected to the equalizer using either of these jacks. However, only one jack may be used at a time. Different methods of connection are described and illustrated on pages 9 and 10.

10 - BALANCED & UNBALANCED OUTPUTS: The equalizer may be connected to the mixing board or amplifier using either of these jacks. The 1/4” phone jack and the XLR jack are balanced. The RCA jacks are unbalanced. Different meth- ods of connection are described and illustrated on pages 9 and 10.

11 - GROUND LIFT: Use this switch to electronically disconnect the signal ground from the mains and chassis earth ground. This may be helpful in eliminating ground loops which cause hum.

12 - VOLTAGE SELECTOR: The equalizer is designed to be used with either 95-130VAC or 190-250VAC power sources. Check the AC line voltage of the outlet and set this switch accordingly before plugging in the unit.

13 - FUSE HOLDER: This contains the fuse for the AC mains. If the fuse blows, replace it with only the same size and type. If the fuse blows repeatedly, check the AC line voltage and the equalizer’s voltage selector switch. If the problem persists contact your Crate Pro Audio dealer.

14 - POWER CORD: Connect the power cord to a suitable source of AC line voltage. Be sure to match the voltage selector

switch (#12) to the line voltage before making this connection! In order to reduce the risk of shock, DO NOT defeat the ground pin of the power cord!

6

Page 5 Page 7
Page 6
Image 6
Crate Amplifiers LS2-215 manual LS1-131/LS3-231 Front and Rear Panels, Power Use this switch to turn the unit on and off
Page 5 Page 7

LS2-215, LS1-131, LS3-231 specifications

Crate Amplifiers has long been a name synonymous with quality sound and innovative technology, and their latest offerings, the LS1-131, LS3-231, and LS2-215, showcase this legacy of excellence. These amplifiers are designed for musicians and sound engineers who demand performance and reliability.

The LS1-131 is a compact yet powerful amplifier that delivers an impressive 100 watts of clean power. It features a versatile 3-channel design, allowing for a wide range of tonal options. The built-in digital effects processor includes reverb, delay, and chorus, enabling users to enhance their sound effortlessly. The LS1-131 is equipped with a 10-inch speaker, which provides a rich, full-bodied tone, making it ideal for both practice and live performances. Additionally, its lightweight design makes it easy to transport, catering to musicians on the go.

Moving up the line, the LS2-215 takes things a step further with a two-channel setup that boasts 200 watts of power. This amplifier is perfect for more demanding performance environments. The LS2-215 features a robust 15-inch speaker that offers deep bass response, making it suitable for genres that require low-end clarity. With its built-in EQ and multiple effects options, users can customize their sound further to suit their style. The durable construction ensures that this amp can withstand the rigors of touring, while the integrated handle allows for easy setup and transport.

At the top of the range, the LS3-231 offers an unrivaled combination of power and versatility with 300 watts of output. This amplifier features a sophisticated 4-channel design, providing musicians with an extensive array of sound-sculpting capabilities. The LS3-231 includes advanced connectivity options, including Bluetooth streaming, which allows for seamless integration with mobile devices for practice or performance. Its dual 12-inch speakers deliver incredible clarity and punch, making it a popular choice for professionals in larger venues.

All three models incorporate Crate's proprietary technology, such as thermal overload protection and robust signal processing, ensuring reliability in demanding situations. The user-friendly interface across the LS series makes it easy to adjust settings on the fly, allowing musicians to focus on their performance rather than their equipment. Whether you're a beginner or a seasoned pro, the Crate LS1-131, LS3-231, and LS2-215 amplifiers provide exceptional sound quality, flexibility, and durability to meet the needs of any performer.
Top Page Image Contents