HU amplitude

[Beatin' 10+ year member]

My HU has a setting called SUB that can go from -10 to +10.

If I put it to +3, for example, does that mean +3db??

Going by how it sounds alone, it does not sound like +3db............

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[trumpet 5,000+ posts]

+10 or -10 are just relative to the 0 position. Like the volume setting, it probably increases logarithmically, but I don't know that for a fact.