The Bi-axis type DV-505 separates one pivot remotely
from the other. It thus encounters two peaks
simultaneously, but each peak is smaller than the two put
together, and horizontal resonance peak is effectively cut
by a couple of unique dampers (See diagram 4), for the
following reason :
So-called '45-45' record groove cutting method which is presently in use, does horizontal cutting at same
phases of input signal and vertical cutting at inverse phases. Because sub-100Hz wave lengths elongate for
more than several meters, stereo recording of low sounds produces, almost comprehensively, same phase
signals for both right- and left-hand side channels and, naturally, signals for horizontal cutting come
excessively to the fore. Then considering disk structure, it Is not possible to impress on it deep-going low
frequency signals.
The DV-505 has solved just that. By reducing peaks over all, it adds to low frequency area stability. Also, it
faithfully tracks surfaces so warped that no other tone arms could negotiate well, and thereby limits effect of
such warped disks on sound reproduction. The DV-505 an out performer.
7. Two dampers
As explained in part 7, DV-505 employs two kinds of damper- - electro magnetic and inertia-controlled type.
●
electro magnetic damper
This damper applies effect of eddy current, which is generated when conductor moves in magnetic
field, and which obstructs conductor in motion. It has almost no damping effect on motion of non-
vibrating tone arm, but is highly effective to vibration of arm, such as arm resonance.
●
Inertia controlled dynamic damper
This damper, incorporated into main arm, consists of a pair of spring and mass, each of these
constituents having a carefully selected constant. This spring mass oscillation system oscillates only
horizontally as main arm resonance occurs, and causes resonance peak to dip.
Phase lag in one oscillation system relative to another is effectively applied in this damper, which
functions only in response to arm resonance.
8. Specifications
System
Bi-axls inertia controlled dynamic balance type tone arm
Total length
335mm (including shell)
