How can I make 3 tubas sound like 6?

Okay, so my band has 80 people in hornline. We typically March 6-8 very strong sousaphones. How can I take the three sousas that we have and make them

Okay, so my band has 80 people in hornline. We typically March 6-8 very strong sousaphones. How can I take the three sousas that we have and make them sound like 6? Like how can I build sound strength? What else can I do to make them sound big? Any help is welcomed.

or:Okay, so my band has 80 people in hornline. We typically March 6-8 very strong sousaphones. How can I take the three sousas that we have and make them sound like 6? Like how can I build sound strength? What else can I do to make them sound big? Any help is welcomed.

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