Thinking on adding a extra sub. Let me hear your advise

[jar1zx 10+ year member]

I have two sundown sd-2 10's .53f^3 per sub sealed behind rear seat of 05 gmc sierra 1500 hd 4 door. 1ohm saz1500 watt amp

My console lid is broke on my console/ seat up front. I was thinking on taking it out and putting one ten in a ported box in its place

Q is I'm already running 1ohm but I have read people say this amp will do .5 ohm. Would I be ok adding 1 extra sub? If its ok should I do a sd 10 or sa 10? Should I go dvc 4 ohm and stay above .5ohm or get a dvc 2ohm and run half a ohm?

Soon to upgrade to Ho alt. right now I have 1/0 gauge ran to amp with big 3 And a red top batt under the hood.

Thx for any input

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[jar1zx 10+ year member]

I may do this after I get a HO alt

But still I have never run a amp below 1ohm. I would like to know how stable the sundown saz 1500 would be doing this or should I just get a 2nd amp?