The DA-401 is a very light tonearm which cannot bear Denon's venerable DL-103 MC cartridge heavyweight oldie : tracking force goes to 2g tops and the equivalent mass for the wand amounts to only... 6g.

The recommended cartridges were Denon's newer DL-303 at first or, later, the DL-305 which both had much better compliance than the 1963 heavyweight.
The DA-401 did keep the Dynamic Damping system inaugurated much earlier in the 70s - some people like it, some people don't...

What is funny is that Denon's earlier, heavier, tonearms did sell much better and the DL-103 did survive the Ultra-Low-Mass fad of the early 1980s while the DA-401 did not.

Type:
Overall length:
Effective length:
Overhang:
Equivalent mass:
Tracking error:
VTA range:
Tracking force:

Max. cartridge weight:

Anti-skating:
Anti-skating:

More:

static balance
32,2cm
24,4cm
14mm
6g
2° max.
40...70mm
2g max.
0,1g steps
4...6g (small cw)
6...11g (large cw)
magnetically operated
(automatic or off)

right here.