Nothing special as it's a normal bass-treble passive correction, valid for a wide range of signal levels and a way to correct tone in signals with not a big loss but without having to power it. The price is excellent and, contrary to the description, they came fully assembled, not as a DIY (see photo)

Nothing special as it's a normal bass-treble passive correction, valid for a wide range of signal levels and a way to correct tone in signals with not a big loss but without having to power it. The price is excellent and, contrary to the description, they came fully assembled, not as a DIY (see photo)

Nothing special as it's a normal bass-treble passive correction, valid for a wide range of signal levels and a way to correct tone in signals with not a big loss but without having to power it. The price is excellent and, contrary to the description, they came fully assembled, not as a DIY (see photo)

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