I'm currently in the process of building columns for my theater and I've chosen to go with Ascend as my speakers. The HTM 200's will be used for surround speakers within the columns. The specifications mention that the depth of the speaker witht he grill is approximately 6.375". What is the true depth without the grill?

If I make the columns 7" deep will that be sufficient enough?

Thank you in advance,

Sammy