Under the seat subs

[John Doe]

Need recommendations on what subs to run and how much. It’s going in a 2019 Sierra Denali. Was told 3 - 8” subs would be the best route any more than that and I’d lose efficiency? Was planning on just going with Sundowns 8” SA subs? Any input would be appreciated

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[audiobaun 5,000+ posts]

Im throwing a pair of Dayton 80 rms tens under each seat on my next build out that I have

 

[audiobaun 5,000+ posts]

I would run a pair of tens minimum. Give you more options to find a decent set rather than 8s. Even a good single 10 will serve as well ported

 

[some dude]

I'd work backwards to find a sub.
What are the dimensions for your box? Subs have certain ideal volume for thru enclosure.
What amplifier will you use? Will it be enough power for the subs you choose and will it support running whatever ohms you wire your subs to?
What is your electrical? Will it be enough to power your amp?