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Heritage Headphone Amplifier issue when using balanced cable?

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A friend of mine bought the Heritage headphone amp last week and it has been working good with the unbalanced output - still does.

He ordered a balanced XLR-4 asap and when he got the adapter it crams out all kind of distorsion, the distorsion seems to follow along with the volume, sounds like when you try to raise the volume on an old amp with a really dirty volume pot but the noise never goes away.
We have tested different headphones and i have measured the balanced cable which seems OK also.. Pin 2 and 4 negative, 1 and 3 positive.

Could it be that one of the 2 amps are broken since it utilizes 2 amps in balanced mode and only 1 in unbalanced? Anyone else had similar issue?



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