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Jensen is a brand synonymous with quality in transformers.  There is no #2.  They are the best.  And while Jensen makes a variety of transformer solutions we only sell one with wild regularity – the VRD-1FF Cable TV Ground Loop Isolator, which is analog, digital and cable modem compatible. (It supersedes the Model VR-1FF).  Why does it sell so well?   If you have a subwoofer with a hum problem or your system has a low frequency hum problem, it is highly likely that it is caused by ground problems.  The venerable VRD-1FF is your only high quality answer to beating this hum problem and it is also cheaper than any power strip, which likely won’t work anyway.  Call 800 NHT 9993 if you need help busting your hum problem.