Join Date: Jan 2014
Location: Oklahoma City, OK
Mentioned: 16 Post(s)
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Quoted: 159 Post(s)
1. Is 4" from the face to the ground enough clearance for the ports (4" precision ports)?
Yes, although even this close you MAY have some boundary effect from the floor, which could SLIGHTLY lower your tune (I would guess the effect would be 1Hz or less). Which is Not a problem.
2. If I add a 90 degree bend to the ports, how much length does that account for? I can cut down the straights to compensate, so what would I trim off (if any)?
Bends don't ADD any length, you just have to measure along the center line of the port.
3. Should the sub be placed center?
I don't think it matters too much. If it's behind your seating, I would face the sub toward the seats.
4. If sub is placed in the center of the box, do I need to worry about standing waves inside the box at all?
I think you'll have to consider standing waves no matter where you place the sub in the box. Not too sure though.
5. How much space is required between the back of the sub and the box?
If the sub's coil has a vent (small hole in the back of the magnet), just enough space for the vent - say at least 1/2 to 1 inch. Not much.
If there's no vent, no space.
HT setup: Vizio 50" 4K | Xbox & PS3 | Pioneer Elite VSX-94TX | Bose 701 towers (V1) | JBL S Center | Def Tech Reference SuperCube & DIY Nearfield cabinet ported UM18 dual ported PA380 ULF+MBM
Last edited by Brazle; 04-20-2018 at 03:26 PM.