Instruction/ maintenance manual of the product LS2-215 Crate Amplifiers
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User ’ s Guide for the 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.
2 LS1-131/LS2-215/LS3-231 Constant Q Graphic Equalizers CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER.
3 LS1-131/LS2-215/LS3-231 Constant Q Graphic Equalizers Figure 1: Constant Q Response: 0 200 500 1k 2k 5k 200 500 1k 2k 5k Amplitude (dB) Frequency (Hz) Inferior broad band filters: width of filter changes with amplitude.
These filters have a relatively low “Q” thus preventing “ringing”. Ringing occurs when a filter instantaneous - ly receives an input signal and hangs on to the signal for a period of time after it has stopped (see Figure 2 below).
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.
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.
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).
Using an Equalizer: Mixing and equalizing music requires an experienced ear and knowledge of the different tonal characteristics of each instrument. The voice characteristics of some common instruments are compared to a conventional 88-note piano keyboard in figure 5 below .
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.
APPLICA TIONS: SOME METHODS OF CONNECTION (Continued): APPLICA TIONS: ROOM EQUALIZA TION: Any sound system, whether it is a home stereo, a large sound reinforcement system, or recording studio moni- tors, will vary in its perceived reproduction depending on its environment; its room.
FEEDBACK CONTROL: Feedback can be a major problem in live sound reproduction. Feedback occurs when an outgoing signal finds its way back into the system via a microphone or a guitar pickup and gets re-amplified. The outgoing signal is the transmitter and the microphone or pickup is the receiver .
www .crateamps.com © 1999 SLM Electronics, Inc. • A Division of St. Louis Music, Inc. 1400 Ferguson Avenue • St. Louis, MO 63133 47-056-01 • 05/99 LS1-131/LS2-215/LS3-231 Constant Q Graphic Equ.
An important point after buying a device Crate Amplifiers LS2-215 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Crate Amplifiers LS2-215 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Crate Amplifiers LS2-215 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Crate Amplifiers LS2-215 you will learn all the available features of the product, as well as information on its operation. The information that you get Crate Amplifiers LS2-215 will certainly help you make a decision on the purchase.
If you already are a holder of Crate Amplifiers LS2-215, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Crate Amplifiers LS2-215.
However, one of the most important roles played by the user manual is to help in solving problems with Crate Amplifiers LS2-215. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Crate Amplifiers LS2-215 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
