Matching Source Volume

[YourNameHere 10+ year member]

so im trying to get everything adjusted and i am wondering if anybody has any tricks or tips to matching HU source volume so everything is on the same level....i was thinking DL a test tone hook up my dmm to amp and play that test tone through all different sources (bluetooth, android auto, usb, etc) and adjust HU source volume (each source has independent level controls) so they all read the same voltage or close to it....or am i way off here?

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[YourNameHere 10+ year member]

anybody?