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  1. Robert_J

    MJ-18 - Box / Amp specs?

    You need 3 ports or go with the Mini-Marty design on that other forum you are on.
  2. Robert_J

    MJ-18 - Box / Amp specs?

    It's good that you modeled with 600 watts because that's about what the amp puts out. It's well known that the Behringer amps do about 60% to 80% of their stated power. One 4" port will chuff like crazy. You need at minimum three 4" flared ports. 4" ports have 12.5 square inches of area...
  3. Robert_J

    MJ-18 - Box / Amp specs?

    I was going to suggest another forum but I see you already posted there. Give it another day or 2 for a response. With the holiday, I have been off-line for a full week. For anyone reading this, just Google "Full Marty subwoofer". I have custom 18" sub from Fix My Speaker dot com and I'm at...
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