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Фрагмент инструкции
Front panel controls and rear panel connectors. Specifications P. 53 4 X 18R/20R Block Diagram X 18R™ / X 20R™ Owner’s Manual How To Use This Manual Format This manual uses a format that is intended to be easy to read, yet technical enough for those who need to know all the details. For feature descriptions, this is done by devoting the left side of each page to 1) an overall module picture, 2) a block diagram, and 3) a control closeup. These images all pertain to the features and control descriptions on the right side of the page. The intention is to make the manual easy to read while including all the technical details needed for getting the most out of the X-Series—a compact, flexible, feature-rich addition to Crest Audio's extensive line of audio mixing console products. Conventions Control Icons This manual uses symbols to illustrate what the control descriptions are referring to.This makes it possible to avoid redundant wording and makes the control descriptions clear. Switch in the UP, non-activated position Switch in DOWN, activated position Switch that illuminates when in the DOWN position Momentary switch that illuminates when activated LEDthat is on,indicating that it's associated feature is activated Potentiometer Standard 1/4"TRSjack (used for line-level inputs and insert sends) 1/4"TRSjack with normal switching (used on insert returns) Female XLRinput jack Male XLRoutput jack 1 Mono Input Channel X 18R™ / X 20R™ Owner’s Manual Module Controls Block Diagram Mono Input Channel 1 Front Panel Features Mono Input channel features are identical for both the X 18R and the X 20R.The X 18R has 14 Mono inputs and the X 20R has 12 Mono inputs. Line Input (Mic Pad) With this switch in the UP position, the input preamp circuit is set up to accept a mic-level signal. This signal is brought in via the XLR mic-input connector located on the rear panel.The 1/4" TRS input jack is ignored. When the switch is depressed, a Pad is inserted into the signal path and the input preamp circuit is set up to accept a line-level signal from either the XLR mic-input connector or the 1/4" TRS input jack,both located on the rear panel.The XLR signal is normaled to the 1/4” TRS jack.If nothing is plugged into the TRS jack,the XLR signal is fed to the preamp when the LINE switch is pressed.Since the TRS signal is always padded down by 26 dB, this feature allows the LINE switch to act as a PAD switch for bringing very hot microphone signals down to a controllable level, avoiding overload.When a plug is inserted into the 1/4" TRS input jack,the XLR mic-input signal is disconnected and the signal present on the 1/4” plug is fed to the preamp. If plugs are inserted into both the XLR andTRS jacks,this switch acts as an input selector switch between the two jacks. Gain The Input Gain control is used to establish proper gain structure in the channel. For best results, use the Solo system to monitor the channel while you set the gain.The goal is maximum gain without distortion. Both the main LED meters (during Solo) and the channel’s Level/Peak indicator can be used for adjusting gain. 70 Hz Lo-Cut Filter This filter reduces or eliminates unwanted low frequencies without substantially affecting the program material. Quite often, such unwanted low frequencies are included with mic-or line-input signals. For example, stage rumble or wind can be picked up through vocal mics.The cut-off frequency of the filter is 70 Hz and the slope is -18 dB per octave.This type of filter is also referred to as a Hi-pass filter (HPF). It allows the high-frequencies to pass, but stops the low-frequencies. Lo Cut Switch Lo-Cut filter is bypassed. Lo-Cut filter is on. 1 Mono Input Channel X 18R™ / X 20R™ Owner’s Manual Module Controls Block Diagram Mono Input Channel 1 Front Panel Features Equalizer (EQ) Many audio signals coming into the console require some degree of corrective EQ in order to be part of a good-sounding mix.The X 18R & X 20R offer a very useful and great-sounding EQ section on each channel.The input EQ consists of four bands: High, High-mid, Low- mid and Low.The High and Low frequency bands each have a boost/cut control and their frequencies are fixed.The High-mid and Low-mid bands each have variable boost/cut along with tunable frequency. High Frequency—HF Boost / Cut 15 dB boost and cut. Shelving @12 kHz High Mid—HM Frequency continuously sweepable between 400 Hz and 8 kHz. Boost / Cut 15 dB boost and cut. Bell curve with a BW of approx 1.5 octaves Low Mid—LM Frequency continuously sweepable between 100 Hz and 2 kHz. Boost / Cut 15 dB boost and cut. Bell curve with a BW of approx 1.5 octaves Low Frequency—LF Boost / Cut 15 dB boost and cut. Shelving @ 80 Hz. EQ On Equalizer is OFF. The equalizer circuitry is bypassed. Equalizer is ON. This switch is used to activate the EQ section and can be used to make A/B comparisons between "flat" and eq'd signals. 1 Mono Input Channel X 18R™ / X 20R™ Owner’s Manual Module Block Diagram Controls Mono ...
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