Reply #4: Grammar Guru here:

[tblue37]

The way we use hyphens for compound adjectives that precede nouns is not always actually required. I would prefer Quad-SD-Channel device as clearer (because immediately so, at a glance), but Quad SD Channel device is neither unclear nor incorrect.

The one thing I would worry about, though, is that they might foolishly decide to use one hyphen but not both, and that would be confusing. Using just one hyphen would be wrong, because (as I understand it) all three descriptors modify the noun as coordinate adjectives, and using one hyphen would relate a pair of adjectives to each other in a way that would privilege their connection rather than the relationship between each adjective and the noun being modified. Avoid:

Quad-SD Channel device
Quad SD-Channel device /

BTW, here is a link to my grammar site:http://www.grammartips.homestead.com/index.html