2 subs sharing same air??

[Bumpin03 10+ year member]

ok my friend asked me this the other day and i thought id ask you (the pros) the question because i didnt want to give him the wrong answer. he just built his box and has the subs sharing the same air...he doesn't have a split enclosure. he asked me if it would hurt the sub...i didn't think it would hurt them but ithought it wouldnt get as loud because 1 sub might steal some of the air from the other one. would it damage the sub??

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[BassiKLowZ 10+ year member]

as long as they are in phase with each other it wont hurt. Most people just put them in a split enclosure to help brace the box. He might want to put braces in their to help the box from flexing, but its no beggie.