Yes, the AR-4x is that size. I have no experience with the KLH 17, but the AR-4x was the first component speaker system I ever bought back when I was about 13 years old and the 4x was then in current production. I bought them again decades later as vintage speakers and used them in my office for over a decade until I retired at the end of 2022. They are good--very, very good, probably the most neutral sounding of all the vintage AR speakers, just with less bass extension but a very pleasing-to-me balance.
For a picture of that office system with the AR-4x speakers, see
this link.
For specs and all the original advertising materials, see the
Classic Speaker Pages.