PM sent… cabinet will be vented 8*34*11(whd) from Parts Express.
That cabinet may be a bit too narrow. The frame of the W18 will extend almost to the edge of the cabinet, so no round-over will be possible and you will be close to screwing the driver into the side walls. Normally, a cabinet for the W18 will be 9" wide.
Also, you do not mention the port tuning frequency or port diameter. So there is no way to determine if the cabinet is the right size for the W18 and whether the port is tuned correctly.
- Jim