How Much Power Do Vandersteen 5a's Really Need?

Beautifully explained Tomic601

Tomic, thanks very much for taking the time to explain things. It's greatly appreciated. I already have the impedance of my CJ in hand ( Input Impedance 100 kOhms).And I can understand the benefits of the external hi pass filters being employed.

However, I still cannot understand how the internal 5a bass amplifiers get a signal so that they are aware of what to reproduce. The information associated with the music being played is sent from the preamp to the M5HP's, and those then connect directly to the amplifier sending the music signal information to the amplifier, which then provides it to the speakers. Do the speaker connections on the 5a's internally distribute the amplified signal to both the bass amplifiers (for the bass signals), and separately to the midrange and tweeters?  

yes ! The internal amp in the 5a accepts a filtered speaker level input

right from your power amp. Now that you know amp input impedence, remove covers and set DIP switches to match settings called out in manual or on stickers affixed to each filter.

The high pass filter reduces the lows at a specific rate, but the lows are increased at the same rate which gives a flat frequency response.