Question about Sunfire TGA-7200 Amplifier
Hi Omar. In an electrical system, a ground loop usually refers to a current, generally unwanted, in a conductor connecting two points that are supposed to be at the same potential, often ground, but are actually at different potentials. Ground loops created by improperly designed or improperly installed equipment are a major cause of noise and interference in audio and video systems. They can also create an electric shock hazard, since ostensibly "grounded" parts of the equipment, which are often accessible to users, are not at ground potential. Take a few minutes to inspect your entire system. If you are not really into the technical aspects of your system, call in a pro as this problem will continue to haunt you until it is found and fixed. J.
Posted on Aug 25, 2010
Any updates on your connections?
Have you tried reconnecting the Sunfire using the RCA and
not the XLR , just for troubleshooting?
Please post to help you further.
Posted on Aug 24, 2010
Ground loop is caused by...
speaker wire hitting the basket of the woofer
grounded speaker wire
speaker leads (strands of wilre) touching opposite terminals at the amplifier.
Wire it all up EXCEPT the speakers - and check each speaker with an OHM meter for proper reistance and possible continuity with ground.
Posted on Aug 23, 2010
Re:" the crackling noise is related to the content that is played.": That usually indicates that there is a fault in the preamp system, that would also explain the low dB in output but amp working (if it was the final, then no sound).
By the way, check grounding (earth on wallplug, bypass extension), and ensure there is no short in speakers connections (this must be done). If problem is an internal failure, as I suspect, then the unit must be tested at component level to find and repair the fault.
Posted on Aug 22, 2010
This can happen for a couple of reasons, ground loops, can occur when the ground connection between components is removed before the other one, like say one unit was ON,and then another unit that was switched OFF was removed from the system, like removing the interconnecting Audio cable. ON should always turn BOTH units OFF before doing any work, this includes the Power Cable to which must be BOTH removed from the wall, to eliminate any chance of a "Potential Difference" between equipment,
Now in the old days... ALL The Component(s) were connected with an individual Earthing wire that was grounded to each and every unit, so in effect they were all Earthed together. More importantly they were all at the same Potential, and there could be NO current flow between units.This is used to prevent this from happening. However this still doesn't mean one can disconnect from each other without FIRST removing them ALL from the power, before doing so.
Now As to another thing you can do, is get yourself some things called "PollyFuses" these are used to protect the speaker, under normal use they are a short circuit, BUT when there is a short circuit, and over a certain current rating is exceeded, below the amps Max Power, the very quickly and spontaneously go OPEN CIRCUIT,and stay there until short is removed, and then reset themselves upon removal of the short. These are invaluable.
Below is all about pollyfuses.
Posted on Aug 21, 2010
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Posted on Jan 02, 2017
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