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1、CAM2 Mixer/Pre-Amplifier Installation and Use Manual 2003 Bogen Communications, Inc. All rights reserved. Specifications subject to change. 54-2039-01C Printed in Korea. 0306 50 Spring Street, Ramsey, NJ 07446, U.S.A. Tel: 201-934-8500 Fax: 201-934-9832; RadioFans.CN 收音机爱 好者资料库 Notice Every effort w
2、as made to ensure that the information in this guide was complete and accurate at the time of printing. However, information is subject to change. Important Safety Information Always follow these basic safety precautions when installing and using the unit: 1.Read all instructions. 2.Follow all warni
3、ngs and instructions marked on the product. 3.DO NOT place the product in a separate enclosure or cab- inet, unless proper ventilation is provided. 4.Never spill liquid on the product. 5.Repair or service must be performed by a factory author- ized repair facility. 6.DO NOT staple or otherwise attac
4、h the AC power supply cord to building surfaces. 7.DO NOT use the product near water or in a wet or damp place (such as a wet basement). 8.DO NOT use extension cords. The product must be installed within 6 feet of a grounded outlet receptacle. 9.Use caution when installing or modifying paging or con
5、trol lines. Applications Assistance Our Applications Engineering Department is available to assist you from 8:30 A.M. to 6:00 P.M. and on call until 8:00 P.M., Eastern Standard / Daylight Time,Monday through Friday.Call 1- 800-999-2809, Option 2. Domestic and International Listings The CAM2 is a UL,
6、 CSA listed product. 13 LIMITED WARRANTY The Bogen CAM2 is warranted to be free from defects in material or workmanship provided that the product has not been subjected to abuse or accident or altered in any way for two (2) years from the date of sale to the original purchaser.Any part of the produc
7、t covered by this warranty that, with normal installation and use, becomes defective will be repaired or replaced by Bogen, at our option, provided the product is shipped insured and prepaid to: Bogen Factory Service Department, 50 Spring Street, Ramsey, NJ 07446, USA.The product will be returned to
8、 you freight prepaid.This warranty does not extend to any of our products that have been subjected to abuse, misuse, improper storage, neglect, accident, improper installation or have been modified or repaired or altered in any manner whatsoever, or where the serial number or date code has been remo
9、ved or defaced. THE FOREGOING LIMITED WARRANTY IS BOGENS SOLE AND EXCLUSIVE WARRANTY AND THE PURCHASERS SOLE AND EXCLUSIVE REMEDY. BOGEN MAKES NO OTHER WAR- RANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED,AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DIS
10、CLAIMED AND EXCLUDED TO THE MAXIMUM EXTENT ALLOWABLE BY LAW.Bogens liability arising out of the manufacture, sale or supplying of products or their use or disposition, whether based upon warranty, contract, tort or otherwise,shall be limited to the price of the product.In no event shall Bogen be lia
11、ble for special,inciden- tal or consequential damages (including, but not limited to, loss of profits, loss of data or loss of use damages) aris- ing out of the manufacture, sale or supplying of products, even if Bogen has been advised of the possibility of such damages or losses.Some States do not
12、allow the exclusion or limitation of incidental or consequential damages,so the above limitation or exclusion may not apply to you.This warranty gives you specific legal rights, and you may also have other rights which vary from State to State. Products that are out of warranty will also be repaired
13、 by the Bogen Factory Service Department - same address as above or call 201-934-8500. The parts and labor involved in these repairs are warranted for 90 days when repaired by the Bogen Factory Service Department. All shipping charges in addition to parts and labor charges will be at the owners expe
14、nse.All returns require a Return Authorization number. RadioFans.CN 收音机爱 好者资料库 Specifications Rated Output Levels Bal Out+4 dBu or -50 dBu (switch selected) Line Out0 dBu Frequency Response+/- 1dB 20 Hz to 20 kHz Distortion at Rated OutputLess than .5% Headroom10 dB MIC Input Equivalent Input Noise
15、-123 dBV (150 ohms source, 22 Hz - 22 kHz) MIC Input Sensitivity 300 uV for rated output MIC Input Impedance600 ohms Aux Input Signal-to-Noise-75 dB (Ref to rated output level, 22 Hz - 22 kHz) Aux Input Sensitivity70 mV for rated output Aux Input Impedance 10k ohms Bal/Out Output Impedance140 ohms (
16、+4 dBu positions) Bal/Out Nominal Load Impedance600 ohms Line Out Output Impedance50 ohms Line Out Nominal Load Impedance600 ohms Crosstalk (adjacent channels)Better than -90 dB Phantom Power+12V DC Output Level Meter (Bar Graph)+3, 0, -3, -8, -12 dB MIC Input Clipping LED-29 dBV (35mV) Controls4 MI
17、C controls 1 AUX control 1 MASTER control 1 POWER switch 4 Phantom Power switches BAL/OUT Output Level switch Temperature Range-10 to +48oC; 14 to 120oF Power Consumption120V AC, 60 Hz, .03A Dimensions113/8 W x 27/8 H x 73/4 D Shipping Weight4 lb. 12 Contents Page INTRODUCTION the MIC input control,
18、the CAM2 MASTER con- trol and the volume control on the amplifier. How should these be set for best operation? Since the MIC control is the closest (electrically),the microphone should be turned up the highest while still allowing enough “headroom” to increase the microphone volume if necessary.The
19、MASTER control should then be adjusted to produce an out- put signal that lights up the red output meter indicator only on loud peaks and the volume control of the amplifier should be set so that the volume of the speakers are as loud as could possibly be needed. By setting the volume controls this
20、way, the amount of undesirable hiss noise, which is produced in all audio equipment, is minimized. This is the correct theory in setting up system gains (volume levels). However, there are some other factors that ought to be considered.For instance,the individual input control should not be set so h
21、igh that it requires the MAS- TER control to be set near zero to keep the output signal level out of the red.There has to be a reasonable amount of “control range” to the MASTER control to make it useful.In this case it is a good idea to reduce the level of the individual input control so that the M
22、ASTER control can be rotated over a wider range to provide some overall level control. During normal operation of a well set up audio system, the MASTER control is used to increase or decrease the overall system level as the noise and audience increases and decreases.However,large changes in the nec
23、essary volume level should be adjusted at the power amplifier. If the signal output level of the CAM2 is near its maximum (as indicated by the output level meter) and the desired speaker level cannot be achieved, even with the power amplifier volume at full, it indicates that the power amplifier or
24、the size/quantity of the speaker is not ade- quate to cover the desired area.This type of problem cannot be corrected by system volume control settings.Trying to get more volume out of a system under these circumstance can only lead to distorted sound since the audio equipment will be pushed beyond
25、their designed maximum operating conditions. Correct the problem by getting more suitable equipment for the job. It is typically desirable to get as much signal level from the output of the CAM2 without making it so large that the output circuit cannot maintain the signal level and begins to distort
26、 the signal. 11 Operation Power This switch applies power to the unit.The Switch Actuator will light to indicate power ON when connected to an AC power source. MIC Gain Control The four MIC volume controls are used to adjust the level of individual mic input channels.Rotate these controls clockwise
27、(to the higher numbers) to increase volume and counter-clockwise (to the lower numbers) to reduce volume.Use these controls and the AUX control to mix the input signals to the desired levels. AUX Gain Control Controls the AUX input volume and functions the same as the MIC volume controls. Clip Indic
28、ator Each input channel has a dedicated red clip- ping indicator to the right of the channels label. During normal operation, the CLIP indicators for each input should remain unlit or light infrequently. If the indicator is lighting frequently or constantly, it indicates that the input is being over
29、driven by too much input signal level.The input of the CAM2 can only accept signals up to a certain level.Once the input signal becomes larg- er than the handling capability of the input circuits,the circuitry will begin to distort the input signal. The distortion will produce poor sound quality on
30、that channel.This condition is called overdriving the input.The distortion of the input signal cannot be corrected by turning down the input level control because the signal is being distorted before the level control can affect it. All the level control can do, in this case, is adjust the level of
31、the now distorted sig- nal.To correct this situation, the level of the signal source must be reduced so that it is no longer overdriving the input.Typically,microphones will not overdrive their inputs. However,other equipment that is connected to a MIC input has a high likelihood of overdriving the
32、input. Note that the -50 dB setting of the CAM2 BAL/OUTs Output Level switch was provided to avoid this very situation when a CAM2 BAL/OUT signal is connected to another MIC input.The AUX input can also be overdriven, but the signal levels necessary to do this are much higher than those of a MIC inp
33、ut. Normally using the outputs of CD players, tuners, and tape players will not cause this problem. However, connection to the speaker outputs of boom boxes, stereo amplifiers, and other equipment designed to drive speakers can overdrive the AUX input. Master Gain Control This control regulates the
34、overall output level of the CAM2. After setting the MIC and AUX con- trols to provide the desired mix of input signal sources,adjust the MASTER control for the desired overall volume level throughout the audio system. The MASTER gain control affects both the BAL/OUT and LINE OUT signals. Output Leve
35、l Meter The output level meter is provided as a tool for getting the optimum performance from the CAM2. Using the individual level controls and the master, adjust the levels as desired but below the level that caused the red +3 output level meter indicator to light (it can light infrequently on shor
36、t peaks in the sound). If the output signal is very low, as in quiet passages in music, the out- put level meter may not light at all.It was designed to assist in the operation of the CAM2 as the output signal levels approach critical maximum output level. If the red indicator is flashing fre- quent
37、ly or constantly, it means that the output signal from the CAM2 is becoming distorted and could be causing poor sound quality.Turn down the MASTER control, or the individual control of a particularly loud input, to bring the meter out of the red range. See the section on setting up system gains for
38、further tips on levels. Introduction the MIC input control,the CAM2 MASTER con- trol and the volume control on the amplifier. How should these be set for best operation? Since the MIC control is the closest (electrically),the microphone should be turned up the highest while still allowing enough “he
39、adroom” to increase the microphone volume if necessary.The MASTER control should then be adjusted to produce an out- put signal that lights up the red output meter indicator only on loud peaks and the volume control of the amplifier should be set so that the volume of the speakers are as loud as cou
40、ld possibly be needed. By setting the volume controls this way, the amount of undesirable hiss noise, which is produced in all audio equipment, is minimized. This is the correct theory in setting up system gains (volume levels). However, there are some other factors that ought to be considered.For i
41、nstance,the individual input control should not be set so high that it requires the MAS- TER control to be set near zero to keep the output signal level out of the red.There has to be a reasonable amount of “control range” to the MASTER control to make it useful.In this case it is a good idea to red
42、uce the level of the individual input control so that the MASTER control can be rotated over a wider range to provide some overall level control. During normal operation of a well set up audio system, the MASTER control is used to increase or decrease the overall system level as the noise and audien
43、ce increases and decreases.However,large changes in the necessary volume level should be adjusted at the power amplifier. If the signal output level of the CAM2 is near its maximum (as indicated by the output level meter) and the desired speaker level cannot be achieved, even with the power amplifie
44、r volume at full, it indicates that the power amplifier or the size/quantity of the speaker is not ade- quate to cover the desired area.This type of problem cannot be corrected by system volume control settings.Trying to get more volume out of a system under these circumstance can only lead to disto
45、rted sound since the audio equipment will be pushed beyond their designed maximum operating conditions. Correct the problem by getting more suitable equipment for the job. It is typically desirable to get as much signal level from the output of the CAM2 without making it so large that the output cir
46、cuit cannot maintain the signal level and begins to distort the signal. 11 Specifications Rated Output Levels Bal Out+4 dBu or -50 dBu (switch selected) Line Out0 dBu Frequency Response+/- 1dB 20 Hz to 20 kHz Distortion at Rated OutputLess than .5% Headroom10 dB MIC Input Equivalent Input Noise -123
47、 dBV (150 ohms source, 22 Hz - 22 kHz) MIC Input Sensitivity 300 uV for rated output MIC Input Impedance600 ohms Aux Input Signal-to-Noise-75 dB (Ref to rated output level, 22 Hz - 22 kHz) Aux Input Sensitivity70 mV for rated output Aux Input Impedance 10k ohms Bal/Out Output Impedance140 ohms (+4 d
48、Bu positions) Bal/Out Nominal Load Impedance600 ohms Line Out Output Impedance50 ohms Line Out Nominal Load Impedance600 ohms Crosstalk (adjacent channels)Better than -90 dB Phantom Power+12V DC Output Level Meter (Bar Graph)+3, 0, -3, -8, -12 dB MIC Input Clipping LED-29 dBV (35mV) Controls4 MIC controls 1 AUX control 1 MASTER control 1 POWER switch 4 Phantom Power switches BAL/OUT Output Level switch Temperature Range-10 to +48oC; 14 to 120oF Power Consumption120V AC, 60 Hz, .03A Dimensions113/8 W x 27/8 H x 73/4 D Shipping Weight4 lb. 12 Contents Page INTRODUCTION
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