Allen SR+Plus+owner+manual+AP0076+part+1电路图.pdf

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1、RadioFans.CN 收音机爱 好者资料库 Online version PART 1? S R S E R I E S OW.:NER H A N D B O O K 2 Effective,from serial number 501001 onwards. This manual includes operating and service information for all models of the SR Series currently in production. Where differences between models exist, such as four b

2、us and two bus models, this is indicated in the text. CONTENTS PAGE INTRODUCTION . Specification Service however, an extra 10dB boost can be obtained by raising the fader full up. Also provides signal feed to auxiliary mix controls A and B or other if selected. (See OPTIONS.) Scribble Patch This spa

3、ce provided for channel identification. Use with grease pencil or other easily erasible marker to avoid permanent damage to the mixer finish. Use of masking or duct tape may damage the silkscreened mixer legend, particularly if left on for long periods of time. S R S E R I E S O W N E R H A N D B O

4、O K 17 GROUP CHANNELS (SR416 and SR424 only) Use of the group channels allows you to control the level of any number of input channels simultaneously. This is extremely helpful in situations where the balance between individual channels is important. For example, let us say that after having establi

5、shed a tight balance between four or more vocal channels, the need suddenly arises to turn the vocals up or down overall. Attempting to change each channel by the same amount is a difficult task at best, and the end result is likely to be a big mess where your nice, tight mix was a minute ago, and y

6、our carefully established balance ruined. Mixing situations which require the operation to be done quickly AND accurately complicate matters further. By assigning the vocal channels to a group, you can adjust the overall vocal level quickly and easily whilst preserving the balance between channels a

7、ssigned to the group. Any number of similar input sources are likely candidates for grouping. Besides vocals, drums, keys, horns-, etc are easier to keep in control when they are assigned to a group. The Group Meter - The group meter is a 1 0 segment LED display which provides a visual indication of

8、 the group output level AFTER the fader, in 3dB steps from -12dB to +6dB. It is a VU (average) responding meter with the 0 position indicating a group output level of OVU or t4dBv (1.23 RMS). Aux/Tape Level Control (SR416 and SR424 only) There may be times when it will be necessary to add signals fr

9、om an external source to the group signal without using a full input channel. This could be taped accompaniment, or pre-recorded sound effects. Regardless of the application, whenever additional audio signals must be combined with the signal of a particular group, it can be done via the aux return.

10、To accomplish this, bring the extra signal into the mixer using the 114 jack socket labelled AUX IN/TAPE IN. Ensure that the AUX/TAPE switch is in the UP (Aux) position. Your signal can now be mixed into the group in any amount you desire using the return level control. The return level control has

11、another function when the button is depressed to select the tape mode. When recording, the track outputs are brought to the AUX/TAPE jacks and when the button is pressed the group fader is disconnected from the panpot (and therefore the L/R outputs) and is replaced with the signal from the tape trac

12、k. It should be noted that this does not disconnect the fader from the group output jack, allowing additional tracks to be recorded from a group while that group is monitoring other tracks. More on this in RECORDING WITH SR. S R S E R I E S O W N E R H A N D B O O K OUTPUT SECTION eft/iht/oni tor Me

13、ters Operate as the group meters in every respect, but will also read other sources as selected by the MONITOR SOURCE select switch (aux C, aux D, mono output, or PFL. ) Aux Masters A and B - - These controls determine the output level of auxiliary mixes A and B. Generally used as FX sends and shoul

14、d be set at around the 5 position for best operating results. Individual input aux send controls should be set at about position 6 to 9. FX Returns 1 and 2 - - By use of the control marked level these inputs can be used to bring signals from external FX devices back into the stereo mix and also perm

15、its a portion of the FX signal to be returned to auxiliary mix buses C and D by using the controls provided for this purpose. The FX signal can be mixed to the aux buses independently of the amount of signal mixed to the L/R outputs; however, internal links are provided in the FX return circuits to

16、enable these controls to take their signal AFTER the level control allowing the FX signal to be mixed to the aux buses in the same proportion as that which is mixed to the L/R outputs. (See OPTIONS.) A PAN control is also provided so that the FX signal can be placed within the stereo image as desire

17、d. The FX return jack is configured to provide either unity return gain or +12dB return gain. For low level (-lOdB) devices, the return plug should be inserted all the way into the jack socket: this. provides 12dB extra gain. For high level devices, insert the plug half way into the FX return jack t

18、o provide unity gain. Use the FX PFL switch to determine the proper position if not certain. Alternatively, use a stereo jack plug and connect the input signal to the ring contact. FX Return PFL Switch - - Depress this switch to listen to the outputs of the FX devices. Should be used for the purpose

19、 of verifying level and sonic quality of the FX signal and for setting delay times, etc prior to bringing them up into the mix. (See PFL - INPUT CHANNEL. ) Peak Indicator LED - Warns of imminent overload distortion (clipping) when the signal level of the L/R outputs gets too high and tells you to re

20、duce the level of the mix. The indication is of the pre LIR output fader signal level. LfR Output Faders Controls the final output level of the stereo mix to the L/R output jacks and the mono summing amplifier. S R S E R I E S O W N E R H A N D B O O K 1 9 MASTER SECTION Phantom Power Switch Connect

21、s 48 volt phantom power to all mic inputs. LED illuminates to indicate phantom power selected. Please consult INPUT CHANNEL operation section for details and cautions regarding the use of phantom power. Also refer to OPTIONS section for information on the method of disconnecting phantom power from i

22、ndividual mic inputs. Aux C/Aux D Masters Level Controls - These controls determine the level o f the auxiliary mix outputs C and D. Output level of these mixes can be read on the L/R MONITOR meters by pressing the appropriate button in the MONITOR SELECT section. Mono Output Level Control - Determi

23、nes the level of the MONO OUTPUT. This is an especially useful feature as it allows your PA system to be driven from the MONO OUTPUT which frees up the L/R output jacks to a1 low simultaneous stereo recording. (See CONNEXION DIAGRAM - SOUND REINFORCEMENT.) Monitor Source Select SwitchesIMon itor Lev

24、el The four pushbutton switches in the master section allow you to monitor the mixer functions both audibly and visually, with the MONITOR LEVEL control governing the listening level to both the MONITOR OUTPUT and the HEADPHONES as we1 1, When all the switches are in .the UP position, the monitor me

25、ters display the stereo output level of the mixer. To monitor other mixer functions, select the appropriate pushbutton and when it is pressed, the meters will switch over to display that function in mono, with the exception of the PFL button. When this button is pressed, no level is displayed unless

26、 a channel, group, or FX PFL button is pressed as well. Essentially, what the PFL button in the master section does is PREPARE the PFL system to receive signals from other areas of the mixer. Monitor Select Priority When using the monitor section, it should be noted that the lowest button pressed ta

27、kes priority over the others. For example, when PFL is selected it will override all other monitor functions. When mono is selected, it overrides the aux buttons but not PFL, and so on. Remember that the lowest button pressed is the source you are listening to. Monitor Level Control Located beneath

28、the monitor select switchbank, this control determines the level of both the monitor AND headphone outputs. S R S E R I E S O W N E R H A N D B O O K Headphone Jack Socket Used to drive a pair of stereo headphones having an impedance of 8-600 ohms. Headphone signal always fol lows signal source sele

29、cted at MONITOR SELECT switchbank. S R S E R I E S O W N E R H A N D B O O K 2 1 RECORDING - W I M SR USE OF GROUP CHANNELS (SR416 and SR424 only) Connection - from Groups - to Recorder This should be done as shown in the multitrack recording diagrams, using the four group outs to a 4 track recorder, and four replays to groups auxltape. GROUP 1 GROUP 2 GROUP 3 GROUP 4 TRACKS 1 TRACKS 2 TRACKS 3 TRACKS 4 The operating level is OVu - +4dBv - 1.23 volts.