This enough?

[soloXgt 10+ year member]

2 4" aeros enough for two 12" Eclipse TI's in 4 cubes?

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[UMWDawg92 10+ year member]

most likely, what are you tuning them too and how much power you running? I have a single TI 12 and was worried about 1 4 inch being enough but as long both ends are flared it'll be fine

 

[RAM_Designs 5,000+ posts]

Have you thought about doing a single 6"er?

 

[pro-rabbit 5,000+ posts]

the 6" is a good option, one I never tried personally with TI subs.