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<blockquote data-quote="T3mpest" data-source="post: 8184542" data-attributes="member: 560148">Ported boxes can sound very good as long as you tune lower.&nbsp; If your at all concerned about output on an 18, I&#039;d go ahead and port it tune low and see what you think of that.&nbsp; How much space do you have?For the second question NO it will NOT cause cancellation.&nbsp; The speakers will still be moving in and out at the same time. However, it looks pretty ghetto (very ghetto) and wont&#039; sound as good generally because your frequency response will be an average of what each size is giving you in each box, unless you get lucky it won&#039;t be smooth nor easily predicted so without an EQ to play with, I wouldn&#039;t.&nbsp; If he wants to upgrade and has the room, keep the 15&#039;s and do a large ported enclosure for them.&nbsp; Probably not as loud as running all 4, but depending on the acoustics it could be and should sound better&nbsp; If you can convince you friend to do the 15&#039;s, keep his 12&#039;s and add one or two more yourself.&nbsp; If you can get a decent deal from him on the used ones that will be a lot of bass on a good budget... It&#039;s&nbsp; a win win.</blockquote>

[QUOTE="T3mpest, post: 8184542, member: 560148"] Ported boxes can sound very good as long as you tune lower. If your at all concerned about output on an 18, I'd go ahead and port it tune low and see what you think of that. How much space do you have? For the second question NO it will NOT cause cancellation. The speakers will still be moving in and out at the same time. However, it looks pretty ghetto (very ghetto) and wont' sound as good generally because your frequency response will be an average of what each size is giving you in each box, unless you get lucky it won't be smooth nor easily predicted so without an EQ to play with, I wouldn't. If he wants to upgrade and has the room, keep the 15's and do a large ported enclosure for them. Probably not as loud as running all 4, but depending on the acoustics it could be and should sound better If you can convince you friend to do the 15's, keep his 12's and add one or two more yourself. If you can get a decent deal from him on the used ones that will be a lot of bass on a good budget... It's a win win. [/QUOTE]

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