Used this product in conjunction with my Alpine ida-x305S, while an amazing headunit, has 2v pre-outs! Luckily, this handy little device not only cleans up my signal, it also puts out 5v pre-outs! NOTICEABLY louder to the ear, and last I metered, I was hitting a 147.2 legal. Bass is definitely cleaner as my headunit is not being driven as hard. As for my highs/mids, the clarity and "tightness" or "dampening factor/deadness" is definitely more noticeable after adding a stronger signal--again, probably attributed to my headunit being at a lower volume now. Overall, EXTREMELY happy with this product and I definitely foresee myself buying another in the near future.
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