alpine ida x100 tuning question.

[sikt]

Ive been reading around about tuning a system and have come to a question. So most guides say turn off all filters and eq stuff and play a test tone or song to 3/4 volume or to distortion. My question is my hu does not have a volume number. Its just a bar so i could make a visual guess at where 3/4 is but that would be kind of hard to know 100 percent what my max volume would be. Any ideas around this or if this hu has a way to show numbers?

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