Amp/Deck Troubleshooting. HELP?

[axeshredder 10+ year member]

Recently had new alpine cde deck put in. have amp, and subs. Sometimes sounds like subs are on, but not "kicked in". Turn volume up, and suddenly subs kick in. As said, were on at lesser volume, but not what should be. Sorry if this doesn't make sense, but it's what's happening. Could it be the deck? or is amp starting to go?

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[Nitefury360 10+ year member]

How did you set your gain