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Title: Poor design, can result in problems
Review: These are of poor design. The ground connection is not carried directly through and that can cause hum and static if the two pieces of equipment are not well grounded to each other by other means. I have done audio engineering for many years. I bought 4 of these and then put them in the trash after testing. The internal attenuators are of "balanced" design but are installed in these unbalanced units, this can cause the mentioned problems.
