CDX refer to the 2 side and the type of glue used to laminate C being the better side D the worser of the 2 X meaning exterior
CDX represents the number 410.
Commonly available plywood grades are AC, BC, and CDX. These plywoods are usually made of pine, southern yellow pine or fir. AC plywood is for projects that require a smooth finish. A being the smooth side, C being somewhat rough. BC is ometimes used for floor underlayment. The B side is sanded and the C side being rough. CDX is an exterior grade plywood that is usually used for sheathing walls and roofs in homebuilding. Again C is rough, D rougher.
ahhh the all time question are you doing a complete tare off? if so 1/2 osb or 1/2 cdx (cdx is a poor grade plywood osb is orientated stand board or wood chips) osb is most economical as it is cheap and it works
CDX after a dog's name means Companion Dog Excellent. (AKC Obedience Title)
The floor joist must be sound and you must have at least 1 1/4 inches of plywood. Top layer MUST be extior grade (CDX grade for example). This is the minimum. Would much rather see 1/2 inch durarock or hardi-backer over 3/4 inch plywood.
It is: CDX = 410
There are various places one can find more information about CDX. One can visit the CDX homepage for more information or go to the US Environmental Protection Agency for helpful CDX hints.
The "DF" stands for douglas fir . It's the type of wood the plywood is made out of.
birch plywood like other plywood is lots bits of wood stuck together with glue or resin
The Pioneer CDX FM687 CD changer has excellent sound quality.
http://www.manualslib.com/manual/158958/Sony-Cdx-L410x-Operating-Instructions.html?page=8