Yes, this is about the original AR-4 and not the 4x or the 4xa. I am well familiar with the 4x speaker, but because I have been mostly unsuccessful locating much specific information about the crossover of the AR-4 speaker (searching both CSP and AK sites), I thought I'd try to pick thru some more knowledgeable brains here. I do know the 4 has a slightly different woofer and a very different tweeter (I have 2ax's, so I know this tweet, or mid) from the 4x which results in a different x-o frequen