8x ultimax 18"

There's always pros/cons when doing commercial versus DIY. Guys who want complete system optimization in a well vetted design...that's not diy. And stuff like a 5 year warranty doesn't hurt. DIY will maximize the output/dollar ratio but, usually, there's is very little re-sale value if the "upgraditis" sets in. And 90% of the "diy" price lists include a "behringer" amplifier. Those are considered (barely)entry level pro amps by any standard. Not much warranty(1 year?).






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The 4cuft enclosures from PE are designed for those Ultimax 18” drivers. They are a great option specially if you have 8 to build. Just glue/clamp or glue/nail & you can slap together a box fairly quickly. Roll on some duratex or spray them then throw some insulation in them & you’ll be up & running. Keep in mind you’ll defiantly want some DSP to control the FR of them to get optimal performance.

Since you are planning on running so many drivers have you considered 4x dual opposed!?

In that case however you would want each enclosure to be 8cuft. There are benefits with force cancellation & output, as the dual drivers being co-located increase perceived output due to coupling.

Are you wanting the drivers in 8 different locations in the room or were you planning to co-locate some of them?