Hi all and happy New year!
I'm wondering if one of the guru's out there can help me out...
I'm looking to build a Johnnysub (with a UM18-22), however, I don't like the style of the ports on any of the marty subs or johnnysub. I know they're designed like that to keep things simple...
I would like to do one inset port like the one they have on the small ported box over at DIYSoundGroup.
Could someone let me know dimensions I would need to make the port width / height / length on the JohnnySub but in that style?
The port on the standard JohnnySub is 24in wide x 2.5in tall x 44in long.
I thought I read that when modifying the port you just need the overall opening and length the same.
So on the standard, if 24 x 2.5 = 60" opening
Subtract out the the two rails IN the port so it's actually 22.5" x 2.5" = 56.25"opening
Could I do a 17.25" wide x 3.25" tall port which would give a very similar, overall 56.06" opening.
(I would keep the same 44 inch length.)
Would this cause other issues that I don't know about?
Also - one last thing... I was thinking about adding 2 inches to overall height (making it 34" tall instead of 32"). This would add about a cubic foot and get it closer to the recommended 8 cu ft for the UM18-22.
Any issues with that? (in addition to the modified port)?
Any and all help is appreciated!