It has been a lot of years since I had both of these speakers togather. My brother still has the AR-7’s and I have been trying to get them back so I can restore them. As I remember the sound on the W25’s was far more transparent than the AR-7. Like the W35’s I just finished with they were marvelous with with Baroque, Rococo music, and really good with ancient music’s of Telemann, Percel, etc. I play this music myself. Recorders, Natural flutes, and especially the Sackbutt. I call this kind of music, “quiet music”. Meaning that is was played in quiet places. The first time played the music of Thomas Tellus in a place that had a long, in this case about a 4 second echo I was stunned. The long cords in this style of music struck a note in that space that lingered long enough that you played the harmony into that echo. This is the sort of music these late W series acoustic suspended Wharfdales do so well.
On the technical side the W25, and the W35 did much better on the lower powered amps I had at the Time. The level pot the W25 made a big difference you could set the tweeter just so, on the AR-7 you switched a fixed resistor to reduce it’s output. You can see the differences in the crossovers. The AR-18 mentioned above has a crossover that is almost a direct copy of thr W25’s Crossover.
I have got into a bad habit with the Wharfdale name. I am a 65+ WPM typist on the PC, and I don’t look at the keyboard. I watch the words appear on the screen. I catch spelling errors. On my iPhone I am a SPC typist, Find Peck and Cuss.