I been shopping for Polk bookshelf speakers and have looked at current RTi models and those going back about 10 years. Noticed that the depth of the cabinets on models with 6 1/2" drivers (RTiA3, RTi6 RTi38, RT35i) became much deeper starting with the RTi6 and RTiA3's. Cabinets on the RTiA3 and RTi6's are 14" deep which is getting really deep for a bookshelf speaker. Previous models with 6 1/2"' drivers, the RTi38 and RT35i, are only about 11-12" deep.
So, my inquiring mind is wondering why there has been a trend to deeper cabinets on the newer bookshelfs models with 6 1/2" drivers. Is it for stronger bass sound?
I'm shopping for bookshelf speakers, but doubt I would buy any with 14" deep cabinets because of placement issues in my limited space, so this is mostly a matter of curiousity for me (am I the only person who's wondered about this?). Can anyone enlighten me?