Don`t know of any mods.But ARC may have an upgrade,contact them.Depends what model and age.You would be surprised what new caps and low noise resistors in the signal path can do for the sound.
Just need to add a comment. There are pro and cons to mods.First I would contact ARC.Depending on your model, an upgrade I believe, would yield the best results.
If you are leaning toward the mod ave run a thread on the pros and cons first.
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