While I'm at it, I have another, more immediate question I need answered. So, when I knock on the cab, on all sides, it responds with a satisfying, high-pitch rap. That suggests to me that I have the enclosure well braced, and have sufficiently subdivided all the panels so that I should have 0 flex. However, when I knock on the cab (sides, top, bracing) while I have my ear right up to the baffle opening, I can hear a distinct ringing / echo inside the box / port.
So, I loaded the sub into the enclosure and hooked it up. The good news is, I have no air leaks and even with ****ty room placement, it sounds pretty damn good. At 20Hz, there is a slight audible chuffing when I am 6 inches from the port. Nothing audible from 4 feet away, and definitely nothing audible at MLP. But that's also at like -19 on the receiver and a sustained 20Hz tone with 1100 watts.
Here's my problem. While playing music (at volumes louder than I would consider comfortable), I can hear some echo / ringing coming from the port with the sub crossed over at 110Hz (which is what the Anthem set it to). I can't hear it from 2 feet away, so I doubt I'd hear it at MLP. But, I also listen to a lot of acoustic music, so I'm concerned that might be an area where that ringing might be audible. Given what I heard when doing my "knock test", I'm wondering if I should spray the inside of the cab with some undercoating treatment? Would that rubberized coating eliminate that echo / ringing effect I'm hearing? And if so, would the non-smooth surface of the coating effect the performance of the air movement inside the cab? Keep in mind, I would not be spraying this inside the port area. Mainly, this would coat the top, bottom, sides, and braces.
Anthem MRX-720 + Dayton Audio APA-102 (for 5.2.4 setup)
L/R/C - Paradigm Signature S6 & C3
LS/RS - Revel M16
4 x Pioneer SP-T22A-LR Upfiring Atmos speakers
DIY Ultimax UM15-22 powered by Crown XLS1002
Ultimax UM15-22 Build
| Pioneer Atmos mods