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Author Topic: Component Engineering MS-55 Booth Monitor Question Mitchell Dvoskin Phenomenal Film Handler Posts: 1869 From: West Milford, NJ, USA Registered: Jan 2001 posted 06-05-2007 09:42 AM                     I have aquired an old Component Engineering MS-55 Booth Monitor. When I hook up the power amp outputs to it, I get a loud hum on only those channels that are connected, along with low volume. As I don't have the owners manual, am I doing something wrong, or is the unit defective. The inputs from the Dolby processor are not being used.  |  IP: Logged Robert Minichino Master Film Handler Posts: 350 From: Haskell, NJ, USA Registered: Dec 2005 posted 06-05-2007 12:11 PM                        You might want to try reversing the polarity of the power amp output connections on the monitor side. (I assume you're talking about the connection between the amp outputs and the inputs for the same on the monitor) If you want I can stop over and have a look some time  |  IP: Logged Chris Slycord Film God Posts: 2986 From: 퍼항시, 경상푹도, South Korea Registered: Mar 2007 posted 06-05-2007 02:52 PM                     http://www.componentengineering.com/contact.html If you email them I'm sure they've got a manual they could send you.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 06-05-2007 03:45 PM                     If the amps have a ground refereneced speaker output then you will probably find that one wants to run only a hot lead to the monitor and at most one with a ground often monitors are a source of ground loops  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 06-05-2007 10:01 PM                     Stop right there!...you have not ground referenced the whole monitor! The Power amp inputs do not have their returns (grounds) connected internally to avoid idiots from connecting either a bridged (balanced) power amp or to avoid those amps that will set up a ground loop if the low side is grounded. Therefore...connect any "E" terminal from your cinema processor to the MS-55 (on the processor side) to provide it with a ground reference...you will most likely solve both your hum and low level issues. Steve  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 06-05-2007 10:21 PM                     I have several CE monitors that have been aquired used that there is an internal ground connection maybe not factory original so as always with anything used open it up  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 06-06-2007 01:56 AM                     Since the MS-55 used genuine lamp cord (2-wire) thre is no ground reference. The chassis can't be used as a reference for the signal for that would mean that you have to ensure that somehow it picked up the ground reference (at low resistance) through the paint of the chassis, the rack rails, which may be movable so they would need to conduct through their paint/powdercoat, though the possibly washered screw. And while star washers can improve that...it is still a very poor way to provide a ground reference...a wire connected for the purpose of grounding is a very good way to provide that reference.  |  IP: Logged

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