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  1. DIY Subwoofers - General Discussion
    Hi there, I have been thinking over the last few days about how a single 21" maesltrom slot ported or with PR's would compare to both my FI Q18 subs for output and SQ. Would I gain alot more output. I could afford to sell both my drivers to get one of the 21"'s. Here's a pic to show them...
  2. DIY Subwoofers - General Discussion
    Does anyone know what the TS parameters are for the FI Q18s with the BP upgrade and if it differs to the ones on the website. cheers Graham
  3. DIY Subwoofers - General Discussion
    Hi there, Can someone advise me on what is the best way to cut out accurate holes for the FI Q18's. I can't find anything to do this. Tips and tricks would be appreciated please. Any videos would be very helpful if possible. cheers Graham
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