Marshall AR-AM4-BG 4-Channel Audio Amp
Contents
1. 1 RU Weight 4 55 Ibs 2 kg PL O AA 10 Specifications continued Input Output ANALOG STEREO INPUT x 4 XLR 3 pin Female 4dBu nominal level balanced differential ANALOG STEREO OUTPUT Selected Outputs 2 x Analog Balanced XLR Reference Active balanced from selected Audio Input 11 Warranty Marshall Electronics warranties to the first consumer that this AR AM4 BG Audio Monitor will under normal use be free from defects in workmanship and materials when received in its original container for a period of one year from the purchase date This warranty is extended to the first consumer only and proof of purchase is necessary to honor the warranty If there is no proof of purchase provided with a warranty claim Marshall Electronics reserves the right not to honor the warranty set forth above Therefore labor and parts may be charged to the consumer This warranty does not apply to the product exterior or cosmetics Misuse abnormal handling alterations or modifications in design or construction void this warranty No sales personnel of the seller or any other person is authorized to make any warranties other than those described above or to extend the duration of any warranties on behalf of Marshall Electronics beyond the time period described above Due to constant effort to improve products and product features specifications may change without notice Marshall Electronics Inc 1910 East Maple Av2. a a ee ne eee ene rer eee ae eee eee 11 WY AS RES AUS se ER E cee ace se onanecauaieeabecenseeaaasenaees 12 This page left intentionally blank Product Overview The AR AM4 BG is a 4 channel stereo analog audio monitoring system with DSP and Peak Meters It features stereo loudspeakers in a compact 1RU form factor with analog amplification and digital processing A front panel bi color phase indicator displays the phase relationship between the left and right channels At only 6 0 deep the AR AM4 BG can be installed in many shallow rack cases or placed on any level surface This unit is enhanced with four pairs of balanced XLR inputs along with a balanced XLR output for interfacing to downstream equipment Controls include separate headphone and speaker volume with master balance and a front panel MUTE button The unit s dual 10 segment bar graph meters provide the ability to visually monitor the audio source A powerful DSP controlled EQ coupled with a limiting compressor provides unparalleled pristine sound and speaker protection Features Selectable Inputs Choose between 4 independent sets of stereo inputs Superior Audio Quality Stereo Loud Speakers provide superior audio quality in a compact 1RU form factor Digital Processing Digital signal processing provides speaker protection Stereo Headphone Output va stereo headphone jack located on front panel LED Bargraph Metering Tri Color LED Display of selected
3. audio levels in stereo Audio Phase Indicator Single LED to indicate 180 Degree phase errors Installation and Initial Setup Unpacking Carefully unpack the AR AM4 BG audio monitor and verify that the following items are included e AR AM4 BG Audio Monitor e Power Supply with 4 Pin XLR Connector 24VDC e AC Power Cable e Operating Instructions Inspect the unit for any physical damage that may have occurred during shipping Should there be any damage immediately contact Marshall Electronics at 800 800 6608 If you are not located within the continental United States call 1 810 333 0606 Audio Monitor Installation The AR AM4 BG audio monitor can be installed in an ElA standard 19 inch rack At only 6 inches deep the AR AM4 BG can also be installed in many shallow racks cases Alternately the AR AM4 BG audio monitor can be placed on any level surface For optimum sound quality the audio monitor should be installed at ear level Quick Start Guide 1 Connect an Audio Source Connect an audio source to any of the 4 pairs of rear panel input connectors We recommend the use of the Balanced XLR female connectors using a balanced audio signal with a nominal level of 4dBu 2 Power On the Audio Monitor Supply power to the audio monitor by connecting the included power supply to an AC power source 100 240 V 50 60 Hz and connecting the power supply s 4 pin XLR connector to the back of the audio monitor The Power L
4. AR AM4 BG Marshall Operating Instructions This page left intentionally blank Contents o NAS recreates case ees se ect aes tes a cuis 5 LET 1 N 5 Installation ang Inital SCD mosca ais 5 UNDACKINO ina aia 5 Audio MONITOF MOUNINO ars dd aaa 5 Quick Start GUide iiceeecceeeececceeeccenecneececceeceneceneeeeceneeeecemeeeeeneeeeesee 6 Functional BIOCK DIA AMES 6 Front Panel Features td nar petete edo ora eb fos edo dr ote den ot ne nes 7 SICTEO LOUTISDEAKETS ia asias 7 POWER LED a E A dada 7 Headphone Jack miastenia ARR rcamiencarncaes 7 PICAGDNONE VOU ii cad Ay 7 TS TT LEE RS A 7 Master VOIUM E A Ra nt Ne IT Cn ie un cet tte en tete CR ete ee en RCH Oe E E cu 7 A ed ee a or NE AS ne el bee aes 7 USE A A tera na atta D A O IN deans Aine Pas conic tea Di mn en Miel 7 Mute Button stan an Seen oe Brite tein naire ne ee Rie nr eee nee ne eevee re Meee teers nt mee eee eee enter er te nee eee rn reenter eT 7 PASS E D EL dea elo li 7 LED Bargraph Level METE uso A rte etre 7 Rear Panel Features ui iia 8 Power MPU eia E T O E O Net ut esse tint 8 AS 09 O OE 8 Audio A LT LT LT E E 8 Audio a RP dl EEE 8 BASIC Ope raul ON sitial didas 9 ANTONI Pere nT eee OO 9 ARS A E RAR eee 9 Channel Selec ar ias e ld e dd lo id eee 9 Balance CONO casonas anos EE T ao a ou aU me OE Ltr E ni ln A a E 9 Headphone QUID ippo Pd 9 A O EN 9 SDECHICATONS e o o e ln Et 10 HPU OUMU crsriss a rrr are ee De
5. ED on the front panel will illuminate green 3 Select Input Channel Use the Input Select controls to choose one of the four inputs 4 Adjust the Volume and Balance Use the Volume and Balance controls to adjust the sound level and stereo balance Functional Block Diagram L IN 1 R RS 485 w Loop L IN 2 R a DSP L EQ Limiter Compressor Delay IN 3 R L Master Master IN 4 Balance Volume R i le LED Driver E L Mute re i Headphone R d Volume y CUSE PA eT Phase Mute Control WU PPM Audio Front Panel Features Marshall O Stereo Loudspeakers The stereo loudspeakers are controlled by the Master Volume Control The sound from the selected source will be heard Power Indication LED The power LED will illuminate green when power is supplied to the audio monitor Headphone Output The headphone output accepts stereo headphones with a 1 4 TRS connector When headphone plug is inserted MUTE is activated and sound to the speakers is cut Headphone Volume Control The headphone volume control affects only the stereo headphone jack Input Select Rotate knob to switch between input channels 1 through 4 This selects the input source for both the speakers and headphone jack Ss AR AM4 BG Master Volume Control The master volume control affects only the stereo speakers O Balance Control The balance control adjusts the relative level of each
6. e El Segundo CA 90245 Tel 800 800 6608 310 333 0606 Fax 310 333 0688 www LCDRacks com sales Icdracks com 12 2010 0629
7. left and right input to the speakers and headphones USB Port For factory and future use only at this time Mute Button Press to silence the speakers The LED will light to indicate MUTE Headphone jack remains active Phase LED Will indicate the wiring polarity of incoming audio comparing left to right GREEN color indicates Left Right is IN Phase RED indicates a 180 Degree Phase Error between Left and Right of the selected input LED Bargraph Level Meter Dual 10 segment LED display of selected audio Source Rear Panel Features Designed by Marshall T 8 L Asoenbled in China INPUTS 4 SH PU INPUTS 3 INPUTS 2 INPUTS 1 SH U USH i P PU PU PUSH i POWER Power Input Connector Use only the included power supply to power the AR AM4 BG audio monitor RS 485 Ports For future functions and firmware upgrades Audio Outputs XLR 3pin male connector Balanced audio out is same level as XLR audio input This is an active output from the selected Audio Input If power is removed from the unit there will be no signal on these connectors Audio Inputs XLR 3pin female connector Balanced audio in Pin 1 ground Pin 2 Signal Pin 3 Signal Basic Operation Overview Basic operation of the AR AM4 BG Audio Monitor involves connecting audio sources and monitoring through the stereo speakers The user can choose between listening to the amplified internal speakers or headphone
8. s Audio volume can be adjusted from front panel controls There are four 4 separate stereo input channels One can be selected at any time from the front panel Controls Volume Control The VOLUME control affects only the stereo speakers Channel Select The Channel Select controls which of the four inputs is selected to the speakers headphones and rear XLR Outputs Balance Control The BALANCE control adjusts the relative levels of the LEFT and RIGHT channels of the input affecting both the stereo speakers and headphone output Headphone Output The headphone output accepts standard stereo headphones with a 1 4 TRS connector Headphones with a 1 8 3 5mm mini plug connector may be used with an adapter NOTE The stereo speakers are muted when a connector is plugged into the headphone output Headphones are not included with this unit MUTE Button The MUTE button cuts the signal to the internal speakers The LED will light to indicate the MUTE condition Sound to the headphone jack is not affected Specifications AR AM4 BG Audio Monitor ACOUSTIC Speaker Power Output Left Right RMS E 40 3W RMS 5W Peak Peak Acoustic Output 99 dB SPL 1m Headphone Power Output 150 mW ELECTRICAL Power Consumption 40W Voltage Requirement 24VDC Included Power Supply AC Input 100V 240V 1 0A 50 60Hz DC Output 24VDC 1 654 MECHANICAL Dimensions w x h x d 19 0 x 1 75 x 6 0 Rack Height
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