The problem cleverly addressed by the DP-8 is that frequencies below around 150 Hz are recorded in mono. It is simply not physically possible to separate these signals into 45° left and 45° right and maintain the correct amplitude at all dynamic levels. In effect this means that the bass is only cut laterally (horisontally).
By placing the lateral f-res as low as possible the frequency and phase response of the bass becomes more linear (= a good thing).
Here is the lateral f-res of my DP8/Blue Precision armtube/Ortofon Royal N.
https://vintagehifi.dk/forum/download/file.php?id=25271&mode=view
Here is the vertical f-res plot of the same
https://vintagehifi.dk/forum/download/file.php?id=25272&mode=view
How does it sound? in a word "excellent". Is it an improvement on the DP 6? Yes.
By placing the lateral f-res as low as possible the frequency and phase response of the bass becomes more linear (= a good thing).
Here is the lateral f-res of my DP8/Blue Precision armtube/Ortofon Royal N.
https://vintagehifi.dk/forum/download/file.php?id=25271&mode=view
Here is the vertical f-res plot of the same
https://vintagehifi.dk/forum/download/file.php?id=25272&mode=view
How does it sound? in a word "excellent". Is it an improvement on the DP 6? Yes.