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Welcome to SMD! Total port area is what we need to look at. As stated by others, it depends on power and box volume. I am sure that @Triticum Agricolam is around here somewhere. He would be the one to ask. 

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21 hours ago, WalledSonic said:

Yes it matters.  You need to keep port velocity down.

Try this: 

After you determine port area, determine port length to get the tuning.

Just sayin.

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It matters for your rise and how quick you fall off out of your tuning.

 

Please someone correct me if I'm wrong. My idea was that if you were on the lower end of port area then you'd be able to play farther out from your tuning than if you had a larger port area

and again this is just a general guidline won't hold true for everything

 

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14 minutes ago, rocking.that.eclipse said:

It matters for your rise and how quick you fall off out of your tuning.

 

Please someone correct me if I'm wrong. My idea was that if you were on the lower end of port area then you'd be able to play farther out from your tuning than if you had a larger port area

and again this is just a general guidline won't hold true for everything

 

Thats true but at the expense of high port velocity and port compression, limiting output due impedance rise, as you mentioned.  Thats why Triticum made the port area calculator that takes power into account.  

Chevy Sonic Wall (4) 15's on 10k Build Log

https://www.stevemeadedesigns.com/board/topic/209412-2015-chevy-sonicwall4-15s10klithiumlarge-case-hairpin-us-alts/

(4) Fi SP4 15's | (2) Ampere 5Ks | Active! | Arc KS600.2 & KS125.2mini | CDT Silk Domes | Silver Flute 8s | 240Ah JY | US Alts

Jeep Wrangler JK (4) 8's in a 4th Order Build Log

https://www.stevemeadedesigns.com/board/topic/209841-shadow-2016-jeep-wrangler-jk4th-order4-8sdc-35klarge-case-hairpin-us-alts/

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